Doc Brown's KS3 Chemistry Quiz Elements, compounds, mixtures methods of separating mixtures for AQA KS3 science courses practice questions Edexcel OCR KS3 science courses US grade 6 7 8 science

Which word means 'it will dissolve'? [7h-1]
1. soluble
2. solute
3. solvent
4. solution
Which word means 'the substance that dissolves'? [7h-2]
1. soluble
2. solute
3. solvent
4. solution
Which word means 'the liquid that dissolves the substance'? [7h-3]
1. soluble
2. solute
3. solvent
4. solution
Which word means 'the mixture from something dissolving'? [7h-4]
1. soluble
2. solute
3. solvent
4. solution
Which of the following means 'it won't dissolve'? [7h-5]
1. insoluble
2. dissolves
3. saturated
4. solubility
Which of the following means 'the solid substance particles completely mix with the solvent particles'? [7h-6]
1. insoluble
2. dissolves
3. saturated
4. solubility
Which of the following about a solution means 'no more will dissolve'? [7h-7]
1. insoluble
2. dissolves
3. saturated
4. solubility
Which of the following means 'how much will dissolve'? [7h-8]
1. insoluble
2. dissolves
3. saturated
4. solubility
Which word means 'something you don't want in a substance'? [7h-9]
1. impurity
2. pure
3. mixture
4. impure
Which word means 'just one substance in the material'? [7h-10]
1. impurity
2. pure
3. mixture
4. impure
Which word means 'more than one substance in the material'? [7h-11]
1. impurity
2. pure
3. mixture
4. saturated
Which word means 'containing a substance you don't want in a material'? [7h-12]
1. impurity
2. pure
3. saturated
4. impure
he process to separate a mixture of sand and salt is shown in the diagram. Which word best goes with 'mixing the salt with water'? [7h-13]
1. dissolving
2. filtering
3. evaporating
4. crystallising
The process to separate a mixture of sand and salt is shown in the diagram. Which word best goes with 'removing the sand'? [7h-14]
1. dissolving
2. filtering
3. evaporating
4. crystallising
The process to separate a mixture of sand and salt is shown in the diagram. Which word best goes with 'removing the water'? [7h-15]
1. dissolving
2. filtering
3. evaporating
4. crystallising
The process to separate a mixture of sand and salt is shown in the diagram. Which word best goes with 'getting the pure salt'? [7h-16]
1. dissolving
2. filtering
3. evaporating
4. crystallising
The process to separate a mixture of sand and salt is shown in the diagram. This process can be used to purify rock salt. Which of these is the solvent? [7h-17]
1. water
2. sand
3. salt
4. salt solution
The process to separate a mixture of sand and salt is shown in the diagram. This process can be used to purify rock salt. Which of these is the insoluble material? [7h-18]
1. water
2. sand
3. salt
4. salt solution
The process to separate a mixture of sand and salt is shown in the diagram. This process can be used to purify rock salt. Which of these is the soluble material? [7h-19]
1. water
2. sand
3. salt
4. salt solution
The process to separate a mixture of sand and salt is shown in the diagram. This process can be used to purify rock salt. Which of these is definitely a mixture? [7h-20]
1. water
2. sand
3. crystallised salt
4. salt solution
Which salt is the most soluble at 15^oC ? [7h-21]
1. NaCl sodium chloride
2. KNO₃ potassium nitrate
3. K₂SO₄ potassium sulfate
4. CuSO₄ copper sulfate
Which salt is the most soluble at 55^oC ? [7h-22]
1. NaCl sodium chloride
2. KNO₃ potassium nitrate
3. K₂SO₄ potassium sulfate
4. CuSO₄ copper sulfate
Which salt is the least soluble at 0^oC ? [7h-23]
1. NaCl sodium chloride
2. KNO₃ potassium nitrate
3. K₂SO₄ potassium sulfate
4. CuSO₄ copper sulfate
Which salt is the 2nd most soluble at 59^oC ? [7h-24]
1. NaCl sodium chloride
2. KNO₃ potassium nitrate
3. K₂SO₄ potassium sulfate
4. CuSO₄ copper sulfate
Which salt changes most in solubility with increase in temperature? [7h-25]
1. KNO₃ potassium nitrate
2. NaCl sodium chloride
3. K₂SO₄ potassium sulfate
4. CuSO₄ copper sulfate
Which salt changes least in solubility with increase in temperature? [7h-26]
1. KNO₃ potassium nitrate
2. NaCl sodium chloride
3. K₂SO₄ potassium sulfate
4. CuSO₄ copper sulfate
What is the solubility of potassium nitrate (KNO₃) in g/100g water at 40⁰C ? [7h-27]
1. 26
2. 60
3. 61
4. 28
What is the solubility of copper sulphate (CuSO₄) in g/100g water at 63⁰C ? [7h-28]
1. 88
2. 90
3. 44
4. 42
What is the solubility of potassium sulphate (K₂SO₄) in g/100g water at 56⁰C ? [7h-29]
1. 18
2. 20
3. 14
4. 22
At what temperature, in ^oC, is the solubility of potassium nitrate (KNO₃) 26g per 100g of water? [7h-30]
1. 13
2. 15
3. 2
4. 4
At what temperature, in ^oC, is the solubility of copper sulphate (CuSO₄) 54g per 100g of water? [7h-31]
1. 96
2. 80
3. 78
4. 98
At what temperature, in ^oC, is the solubility of potassium nitrate (KNO₃) 92g per 100g of water? [7h-32]
1. 56
2. 38
3. 36
4. 54
The process illustrated is called? [7h-33]
1. simple distillation
2. fractional distillation
3. filtration
4. sedimentation
In the process illustrated, the change from liquid to vapour is called? [7h-34]
1. distillation
2. evaporation
3. condensation
4. fractionation
In the process illustrated, the change from vapour to liquid is called? [7h-35]
1. distillation
2. evaporation
3. condensation
4. fractionation
In the process illustrated, any dissolved solids will not distil over because they have? [7h-36]
1. too low a boiling point
2. too low a melting point
3. too high a melting point
4. too high a boiling point
The separation process illustrated is called? [7h-37]
1. chromatography
2. distillation
3. filtration
4. radiography
The separation process result illustrated is called the? [7h-38]
1. distillate
2. chromatogram
3. filtrate
4. evaporate
The chromatography separation shows that mixture 6? [7h-39]
1. contains no purple or red
2. contains four colours
3. contains no green or purple
4. only contains blue and red
The chromatography separation shows that mixture 6? [7h-40]
1. contains no green or red
2. contains two colours
3. contains no brown or purple
4. contains blue, brown and red
Which is the fastest way to dissolve a solid in a liquid? [7h-41]
1. heat and stir the liquid and solid mixture
2. put lots of the solid in the liquid
3. put a little solid in a lot of the liquid
4. stir equal amounts of solid and liquid vigorously
Which is the best method to separate coloured substances? [7h-42]
1. distillation
2. chromatography
3. filtration
4. evaporation
If 100 cm³ of saturated potassium nitrate (KNO₃) solution was cooled from 60^oC to 20^oC, what mass of potassium nitrate crystals will form? [7h-43]
1. 70g
2. 78g
3. 74g
4. 82g
If 100 cm³ of saturated copper sulphate (CuSO₄) solution was cooled from 100^oC to 30^oC, what mass of blue copper sulphate crystals will form? [7h-44]
1. 52g
2. 48g
3. 60g
4. 56g
Which corresponds to the particle picture shown? [7h-45]
1. a pure liquid
2. a solution
3. pure crystals
4. impure crystals
Which corresponds to the particle picture shown? [7h-46]
1. a pure liquid
2. a solution
3. pure crystals
4. impure crystals
Which corresponds to the particle picture shown? [7h-47]
1. a pure liquid
2. a solution
3. pure crystals
4. impure crystals
Which corresponds to the particle picture shown? [7h-48]
1. a pure liquid
2. a solution
3. pure crystals
4. impure crystals
Which corresponds to the particle picture shown? [7h-49]
1. a pure liquid
2. a solution
3. pure crystals
4. impure crystals
Which corresponds to the particle picture shown? [7h-50]
1. a pure liquid
2. a solution
3. pure crystals
4. impure crystals
Which corresponds to the particle picture shown? [7h-51]
1. a pure liquid
2. a solution
3. pure crystals
4. impure crystals
Which corresponds to the particle picture shown? [7h-52]
1. a pure liquid
2. a solution
3. pure crystals
4. impure crystals
What temperature does the Celsius thermometer read in ^oC ? [7h-53]
1. 36
2. 34
3. 44
4. 35.5
What temperature does the Celsius thermometer read in ^oC ? [7h-54]
1. 3
2. -7
3. 7
4. -3
What temperature does the Celsius thermometer read in ^oC ? [7h-55]
1. 101
2. 102
3. 101.5
4. 103
What temperature does the Celsius thermometer read in ^oC ? [7h-56]
1. 46
2. 47
3. 53.5
4. 46.5
What temperature does the Celsius thermometer read in ^oC ? [7h-57]
1. 132
2. 144
3. 126
4. 131
What temperature does the Celsius thermometer read in ^oC ? [7h-58]
1. 46.5
2. 53
3. 51.5
4. 63.5
What temperature does the Celsius thermometer read in ^oC ? [7h-59]
1. 203
2. 201.5
3. 206
4. 227
What temperature does the Celsius thermometer read in ^oC ? [7h-60]
1. 68.5
2. 81.5
3. 76
4. 77
In this process the change from liquid to vapour is called? [7h-61]
1. boiling
2. distilling
3. condensing
4. fractionating
The process to get pure salt from rock salt is shown in the diagram. Which of the following would be described as impure? [7h-62]
1. water
2. rock salt
3. crystallised salt
4. salt solution
The process to get pure salt from rock salt is shown in the diagram. Which of the following would be described as a mixture? [7h-63]
1. water
2. crystallised salt
3. rock salt
4. steam
The process to get pure salt from rock salt is shown in the diagram. Which of the following would be described as a 'suspension'? [7h-64]
1. the evaporating water
2. the crystallising salt
3. the insoluble solids settling out
4. stirred water and fine sand particles
Which of the words listed goes along with the phrase .... [7h-65]
'explaining something we observed'?
1. interpretation
2. description
3. evaluation
4. prediction
Which of the words listed goes along with the phrase .... [7h-66]
'how we did the experiment'?
1. interpretation
2. description
3. evaluation
4. prediction
Which of the words listed goes along with the phrase .... [7h-67]
'how successful was our experiment'?
1. interpretation
2. description
3. evaluation
4. prediction
Which of the words listed goes along with the phrase .... [7h-68]
'what might happen in our experiment'?
1. interpretation
2. description
3. evaluation
4. prediction
Which corresponds to the particle picture shown? [7h-69]
1. a mixture of liquids
2. pure liquid
3. pure crystals
4. impure crystals
Which corresponds to the particle picture shown? [7h-70]
1. a pure liquid
2. mixture of liquids
3. pure crystals
4. impure crystals
The process to get pure salt from rock salt is shown in the diagram.
Which of the following would be described a 'sediment'? [7h-71]
1. the evaporating water
2. the crystallising salt
3. the insoluble solids settling out
4. stirred water and fine sand particles
Apparatus number 1 is called a? [7h-72]
1. thermometer
2. magnetic stirrer
3. diddler
4. stirring rod
Apparatus number 2 is called a? [7h-73]
1. beaker
2. conical flask
3. boiling flask
4. evaporating dish
Apparatus number 3 is called a? [7h-74]
1. Buchner burner
2. bunsen burner
3. gas burner
4. natural burner
Apparatus number 4 is called a? [7h-75]
1. filter sieve
2. filter pump
3. filter funnel
4. filteriser
Apparatus number 5 is called a? [7h-76]
1. chromatography paper
2. sieve paper
3. sediment paper
4. filter paper
Apparatus number 6 is called a? [7h-77]
1. evaporating dish
2. boiling basin
3. cooking basin
4. boiling dish
Apparatus number 7 is called a? [7h-78]
1. calibrated beaker
2. measuring cylinder
3. conical cylinder
4. measuring flask
The diagram shows the results of a chromatography investigation into the colours extracted from sweets. From the results you can say? [7h-79]
1. brown is made of blue, green and yellow colours
2. purple is made of green and red colours
3. blue, red and yellow are each made up of just one colour
4. green is made of blue and red colours
The diagram shows the results of a chromatography investigation into the colours extracted from sweets. From the results you can say? [7h-80]
1. brown is made of blue, green and yellow colours
2. purple is made of green and red colours
3. blue, green and red are each made up of just one colour
4. green is made of blue and yellow colours
The diagram shows the results of a chromatography investigation into the colours extracted from sweets. From the results you can say? [7h-81]
1. brown is made of blue, red and yellow colours
2. purple is made of green and red colours
3. blue, green and red are each made up of just one colour
4. green is made of blue and red colours
The diagram shows the results of a chromatography investigation into the colours extracted from sweets. From the results you can say? [7h-82]
1. brown is made of blue, green and yellow colours
2. purple is made of blue and red colours
3. blue, green and red are each made up of just one colour
4. green is made of blue and red colours
The diagram shows the results of a chromatography investigation into the colours extracted from sweets. From the results you can say? [7h-83]
1. brown is made of blue and yellow colours
2. purple is made of red and yellow colours
3. brown is made of green and red colours
4. green is made of blue and red colours
The diagram shows the results of a chromatography investigation into the colours extracted from sweets. From the results you can say? [7h-84]
1. brown is made of green and yellow colours
2. purple is made of red and yellow colours
3. green is made of blue and red colours
4. brown is made of purple and yellow colours
Which of these can be described as 'soluble in water'? [7h-85]
1. sugar
2. glass
3. polythene
4. sand
Which of these can be described as 'insoluble in water'? [7h-86]
1. sugar
2. glass
3. table salt
4. copper sulphate
At which temperature in ^oC does the solubility of sodium chloride equal that of potassium nitrate? [7h-87]
1. 55
2. 20
3. 23
4. 30
At which temperature in ^oC does the solubility of sodium chloride equal that of copper sulfate? [7h-88]
1. 51
2. 35
3. 23
4. 55
Which of these can make a solid substance dissolve faster in a liquid? [7h-89]
1. heat the solid-liquid mixture
2. use larger lumps of solid in a small volume of liquid
3. let the large undissolved pieces settle out
4. use a little solid at a time to a large volume of liquid
Which of these can make a solid substance dissolve faster in a liquid? [7h-90]
1. cool the solid-liquid mixture
2. use smaller lumps of solid
3. let the large undissolved pieces settle out
4. use a little solid at a time to a large volume of liquid
Which of these can make a solid substance dissolve faster in a liquid? [7h-89]
1. cool the solid-liquid mixture
2. use larger lumps of solid in a small volume of liquid
3. stir the mixture regularly
4. use a little solid at a time to a large volume of liquid
Which of these is NOT a good idea to make a solid substance dissolve faster in a flammable liquid? [7h-92]
1. use a little solid at a time to a large volume of liquid
2. use larger lumps of solid in a small volume of liquid
3. let the large undissolved pieces settle out
4. heat the solid-liquid mixture
Approximately what mass of copper sulfate will dissolve in 50g of water at 30^oC ? [7h-93]
1. 12g
2. 24g
3. 48g
4. 6g
Approximately what mass of potassium nitrate will dissolve in 200g of water at 20^oC ? [7h-94]
1. 32g
2. 64g
3. 16g
4. 6g
Approximately what is the minimum mass of water you can completely dissolve 28g of copper sulfate in at 80^oC ? [7h-95]
1. 100g
2. 200g
3. 50g
4. 25g
Approximately what is the minimum mass of water you can completely dissolve 36g of potassium sulfate in at 60^oC ? [7h-95]
1. 100g
2. 25g
3. 50g
4. 200g
Which method of separation shown in the diagram is filtration? [7h-97]
1. method 1
2. method 2
3. method 3
4. method 4
5. method 5
Which method of separation shown in the diagram removes excess liquid? [7h-98]
1. method 1
2. method 2
3. method 3
4. method 4
5. method 5
Which method of separation shown in the diagram is simple distillation? [7h-99]
1. method 1
2. method 2
3. method 3
4. method 4
5. method 5
Which method of separation shown in the diagram is chromatography? [7h-100]
1. method 1
2. method 2
3. method 3
4. method 4
5. method 5
Which method of separation shown in the diagram is used to separate grit particles from muddy water? [7h-101]
1. method 1
2. method 2
3. method 3
4. method 4
5. method 5
Which method of separation shown in the diagram is used to separate copper sulphate crystals from its solution in water? [7h-102]
1. method 1
2. method 2
3. method 3
4. method 4
5. method 5
Which method of separation shown in the diagram is used to separate pure water from seawater? [7h-103]
1. method 1
2. method 2
3. method 3
4. method 4
5. method 5
Which method of separation shown in the diagram is used to analyse a forged cheque? [7h-104]
1. method 1
2. method 2
3. method 3
4. method 4
5. method 5
Which is a TRUE statement about water solubility, and purifying rock salt by dissolving, filtering, evaporating and crystallising? [7h-105]
1. most compounds are more soluble at a higher temperature than a lower temperature
2. solubility data for water are given between 0-100^oC because that's the only temperature range we use in laboratory experiments
3. salt particles pass through the filter paper because they are attracted to water molecules
4. one reason why the mass of pure salt crystals obtained is less than the original rock salt is because of losses by evaporation
Which is a TRUE statement about water solubility, and purifying rock salt by dissolving, filtering, evaporating and crystallising? [7h-106]
1. most compounds are less soluble at a higher temperature than a lower temperature
2. solubility data for water are given between 0-100^oC because its limited by the freezing and boiling point of water
3. salt particles pass through the filter paper because they are attracted to water molecules
4. one reason why the mass of pure salt crystals obtained is less than the original rock salt is because of losses by evaporation
Which is a TRUE statement about water solubility, and purifying rock salt by dissolving, filtering, evaporating and crystallising? [7h-107]
1. most compounds are less soluble at a higher temperature than a lower temperature
2. solubility data for water are given between 0-100^oC because that's the only temperature range we use in laboratory experiments
3. salt particles pass through the filter paper because they are so small compared to the pores of the filter paper
4. one reason why the mass of pure salt crystals obtained is less than the original rock salt is because of losses by evaporation
Which is a TRUE statement about water solubility, and purifying rock salt by dissolving, filtering, evaporating and crystallising? [7h-108]
1. most compounds are less soluble at a higher temperature than a lower temperature
2. solubility data for water are given between 0-100^oC because that's the only temperature range we use in laboratory experiments
3. salt particles pass through the filter paper because they are attracted to water molecules
4. one reason why the mass of pure salt crystals obtained is less than the original rock salt is because of the filtered impurities
Which is a TRUE statement about water solubility, and purifying rock salt by dissolving, filtering, evaporating and crystallising? [7h-109]
1. one reason why the mass of pure salt crystals obtained is less than the original rock salt is because liquid is left in the beaker or on the filter paper
2. solubility data for water are given between 0-100^oC because that's the only temperature range we use in laboratory experiments
3. salt particles pass through the filter paper because they are attracted to water molecules
4. most compounds are less soluble at a higher temperature than a lower temperature
Which statement is TRUE about the distillation process shown in the diagram, to purify water from blue ink? [7h-110]
1. some dissolved salts can distil over
2. the thermometer at Y will register 100^oC
3. the state change at X is called condensation
4. the state change in Z is called evaporation
Which is TRUE about the distillation process shown in the diagram, to purify water from blue ink? [7h-111]
1. some dissolved salts can distil over
2. the thermometer at Y will only register 90^oC
3. the state change at X is called boiling
4. the state change in Z is called evaporation
Which is TRUE about the distillation process shown in the diagram, to purify water from blue ink? [7h-112]
1. some dissolved salts can distil over
2. the thermometer at Y will only register 90^oC
3. the state change at X is called crystallisation
4. the state change in Z is called condensation
The process to get pure salt from rock salt is shown in the diagram. Which of the following would be described as the filtrate? [7h-113]
1. pure water
2. clear salt solution
3. pure crystallised salt
4. rock salt impurity particles
Apparatus number 8 is called a? [7h-114]
1. crystallising dish
2. boiling basin
3. gauze
4. tripod
Apparatus number 9 is called a? [7h-115]
1. crystallising dish
2. boiling basin
3. gauze
4. tripod
What could this particle picture represent? [7h-116]
1. water
2. petrol
3. bronze
4. glucose
What could this particle picture represent? [7h-117]
1. water
2. petrol
3. brass
4. glucose
What could this particle picture represent? [7h-118]
1. air
2. water
3. oxygen
4. petrol
What could this particle picture represent? [7h-119]
1. oxygen
2. water
3. petrol
4. air
What could this particle picture represent? [7h-120]
1. ice
2. brass
3. bromine
4. paraffin
What could this particle picture represent? [7h-121]
1. glucose
2. brass
3. bromine
4. paraffin
What could this particle picture represent? [7h-122]
1. glucose
2. petrol
3. rock salt
4. water
What could this particle picture represent? [7h-123]
1. hexane
2. sand
3. glucose
4. salt solution
Which method of separation shown in the diagram is fractional distillation? [7h-124]
1. method 1
2. method 2
3. method 3
4. method 4
5. method 5
Which method of separation shown in the diagram is used to separate the complex mixture in crude oil? [7h-125]
1. method 1
2. method 2
3. method 3
4. method 4
5. method 5
Which method of separation shown in the diagram is the best to separate ethanol (alcohol) from a solution of it in water? [7h-126]
1. method 1
2. method 2
3. method 3
4. method 4
5. method 5
The diagram shows a method of separating a liquid from a solution containing dissolved solid impurities. What is the name of the procedure? [7h-127)
1. simple distillation
2. fractional distillation
3. filtration
4. evaporation
The diagram shows a method of separating a liquid from a solution containing dissolved solid impurities. What is happening to the liquid at X? [7h-128)
1. condensing
2. boiling
3. filtering
4. subliming
The diagram shows a method of separating a liquid from a solution containing dissolved solid impurities. What is the piece of apparatus at Z? [7h-129)
1. thermometer
2. fractionating column
3. condenser
4. long flask
The diagram shows a method of separating a liquid from a solution containing dissolved solid impurities. What is the piece of apparatus at Y? [7h-130)
1. barometer
2. thermistor
3. condenser
4. thermometer
The diagram shows a method of separating a liquid from a solution containing dissolved solid impurities. What state change happens in Z? [7h-131)
1. condensing
2. evaporating
3. distilling
4. boiling
The diagram shows a method of separating a liquid from a solution containing dissolved solid impurities. What is collected at W? [7h-132)
1. evaporate
2. distillate
3. filtrate
4. crystallite
After purifying a liquid contaminated with a dissolve solid, how might you conveniently identify the liquid e.g. water? [7h-133]
1. measure its freezing point
2. measure it density
3. measure its boiling point
4. measure its viscosity
After purifying an organic solid by crystallisation from a solvent, how might you conveniently identify the solid? [7h-134]
1. measure its viscosity
2. measure it density
3. measure its boiling point
4. measure its melting point
Why can a mixture of liquids be separated by fractional distillation? [7h-135]
1. they have different boiling points
2. they have different melting points
3. they have different densities
4. they have different freezing points
In fractional distillation, from reading the thermometer, how do you know when a pure liquid is distilling over from the boiling mixture? [7h-136]
1. the temperature steadily rises
2. the temperature stays constant for a time
3. the temperature steadily falls
4. the temperature fluctuates until a component has completely boiled over
Which method of separation illustrated in the diagram would be used to remove insoluble material at a water treatment plant? [7h-137]
1. method 1
2. method 2
3. method 3
4. method 4
5. method 5
Which method of separation illustrated in the diagram would be used to crystallise Epsom's salt from spring water? [7h-138]
1. method 1
2. method 2
3. method 3
4. method 4
5. method 5
Which method of separation illustrated in the diagram would be used to manufacture sea salt? [7h-139]
1. method 1
2. method 2
3. method 3
4. method 4
5. method 5
Which method of separation illustrated in the diagram would be used to recover and recycle a solvent containing dissolve solid impurities, that is used in a manufacturing process? [7h-140]
1. method 1
2. method 2
3. method 3
4. method 4
5. method 5
Which method of separation illustrated in the diagram would be used to investigate the dyes used in pen inks? [7h-141]
1. method 1
2. method 2
3. method 3
4. method 4
5. method 5
Which method of separation illustrated in the diagram would be used to investigate the dyes used in sweets or iced cakes? [7h-142]
1. method 1
2. method 2
3. method 3
4. method 4
5. method 5
Which method of separation illustrated in the diagram would be used to manufacture oxygen and nitrogen from liquified air? [7h-143]
1. method 1
2. method 2
3. method 3
4. method 4
5. method 5
Given the STATEMENT about ...., decide whether it is TRUE or FALSE for an ELEMENT, COMPOUND or MIXTURE [8f-1]
STATEMENT about .... ELEMENT COMPOUND MIXTURE
has a fixed melting point? true or false? true or false? true or false?
1. true, true, false
2. true, false, false
3. false, false, true
4. false, true, true
Given the STATEMENT about ...., decide whether it is TRUE or FALSE for an ELEMENT, COMPOUND or MIXTURE [8f-2]
STATEMENT about .... ELEMENT COMPOUND MIXTURE
has only one type of atom? true or false? true or false? true or false?
1. true, true, false
2. true, false, false
3. false, false, true
4. false, true, true
Given the STATEMENT about ...., decide whether it is TRUE or FALSE for an ELEMENT, COMPOUND or MIXTURE [8f-3]
STATEMENT about .... ELEMENT COMPOUND MIXTURE
always has the same composition? true or false? true or false? true or false?
1. false, true, true
2. true, false, false
3. true, true, false
4. false, false, true
Given the STATEMENT about ...., decide whether it is TRUE or FALSE for an ELEMENT, COMPOUND or MIXTURE [8f-4]
STATEMENT about .... ELEMENT COMPOUND MIXTURE
has a definite chemical symbol or formula? true or false? true or false? true or false?
1. false, false, true
2. true, false, true
3. false, true, false
4. true, true, false
Given the STATEMENT about ...., decide whether it is TRUE or FALSE for an ELEMENT, COMPOUND or MIXTURE [8f-5]
STATEMENT about .... ELEMENT COMPOUND MIXTURE
has no fixed boiling point? true or false? true or false? true or false?
1. false, false, true
2. true, false, true
3. false, true, false
4. true, true, false
Given the STATEMENT about ...., decide whether it is TRUE or FALSE for an ELEMENT, COMPOUND or MIXTURE [8f-6]
STATEMENT about .... ELEMENT COMPOUND MIXTURE
is easily separated into different substances? true or false? true or false? true or false?
1. false, true, true
2. false, false, true
3. true, true, false
4. true, false, false
Given the STATEMENT about ...., decide whether it is TRUE or FALSE for an ELEMENT, COMPOUND or MIXTURE [8f-7]
STATEMENT about .... ELEMENT COMPOUND MIXTURE
has more than one type of atom? true or false? true or false? true or false?
1. true, true, false
2. false, false, true
3. false, true, true
4. true, false, false
Given the STATEMENT about ...., decide whether it is TRUE or FALSE for an ELEMENT, COMPOUND or MIXTURE [8f-8]
STATEMENT about .... ELEMENT COMPOUND MIXTURE
there are only about 100 of them? true or false? true or false? true or false?
1. true, true, false
2. false, false, true
3. false, true, true
4. true, false, false
When some salt is dissolved in plenty of water, which statement is most likely TRUE about the resulting solution? [8f-13]
1. the boiling point is higher than pure water
2. the freezing point is higher than pure water
3. the boiling point decreases the longer the solution is boiled
4. the solution becomes less concentrated the longer it is boiled
When some salt is dissolved in plenty of water, which statement is most likely TRUE about the resulting solution? [8f-14]
1. the boiling point is lower than pure water
2. the freezing point is lower than pure water
3. the boiling point decreases the longer the solution is boiled
4. the solution becomes less concentrated the longer it is boiled
When some salt is dissolved in plenty of water, which statement is most likely TRUE about the resulting solution? [8f-15]
1. the boiling point is lower than pure water
2. the freezing point is higher than pure water
3. the boiling point increases the longer the solution is boiled
4. the solution becomes less concentrated the longer it is boiled
When some salt is dissolved in plenty of water, which statement is most likely TRUE about the resulting solution? [8f-16]
1. the boiling point is lower than pure water
2. the freezing point is higher than pure water
3. the boiling point decreases the longer the solution is boiled
4. the solution becomes more concentrated the longer it is boiled
Which order of the three words matches the three substances iron, iron oxide, steel ?, ?, ? [8f-17]
1. element, compound, mixture
2. compound, element, mixture
3. mixture, compound, element
4. element, mixture, compound
Which order of the three words matches the three substances a salt, sodium, seawater ?, ?, ? [8f-18]
1. element, compound, mixture
2. compound, element, mixture
3. mixture, compound, element
4. element, mixture, compound
Which order of the three words matches the three substances brass, copper oxide, zinc ?, ?, ? [8f-19]
1. element, compound, mixture
2. compound, element, mixture
3. mixture, compound, element
4. element, mixture, compound
Which order of the three words matches the three substances hydrogen, petrol, water ?, ?, ? [8f-20]
1. element, compound, mixture
2. compound, element, mixture
3. mixture, compound, element
4. element, mixture, compound
Which order of the three words matches the three substances carbon dioxide, coal, carbon ?, ?, ? [8f-21]
1. compound, mixture, element
2. mixture, compound, element
3. element, mixture, compound
4. compound, element, mixture
Which order of the three words matches the three substances plaster of Paris, gypsum, flowers of sulphur ?, ?, ? [8f-22]
1. compound, mixture, element
2. mixture, compound, element
3. element, mixture, compound
4. compound, element, mixture
Which order of the three words matches the three substances chlorine, rock salt, sodium chloride ?, ?, ? [8f-23]
1. compound, mixture, element
2. mixture, compound, element
3. element, mixture, compound
4. compound, element, mixture
Which order of the three words matches the three substances sodium hydroxide, oxygen, bleach ?, ?, ? [8f-24]
1. compound, mixture, element
2. mixture, compound, element
3. element, mixture, compound
4. compound, element, mixture
Which two words apply to the substance nitrogen at room temperature and pressure? [8f-25]
1. gas, element
2. liquid, compound
3. solid, mixture
4. gas, compound
Which two words apply to the substance copper sulphate at room temperature and pressure? [8f-26]
1. gas, element
2. solid, compound
3. solid, mixture
4. gas, compound
Which two words apply to the substance wood? [8f-27]
1. gas, element
2. solid, compound
3. solid, mixture
4. gas, compound
Which two words apply to the substance sulfur dioxide at room temperature and pressure? [8f-28]
1. gas, element
2. solid, compound
3. solid, mixture
4. gas, compound
Which two words apply to the substance vinegar at room temperature and pressure? [8f-29]
1. liquid, mixture
2. solid, element
3. gas, mixture
4. liquid, element
Which two words apply to the substance magnesium at room temperature and pressure? [8f-30]
1. liquid, mixture
2. solid, element
3. gas, mixture
4. liquid, element
Which two words apply to the substance air at room temperature and pressure? [8f-31]
1. liquid, mixture
2. solid, element
3. gas, mixture
4. liquid, element
Which two words apply to the substance mercury at room temperature and pressure? [8f-32]
1. liquid, mixture
2. solid, element
3. liquid, compound
4. liquid, element
Which method of separation is best to use for obtaining salt from seawater? [8f-42]
1. distillation
2. evaporation
3. filtration
4. chromatography
Which method of separation is best to use for removing silt from muddy water? [8f-43]
1. distillation
2. evaporation
3. filtration
4. chromatography
Which method of separation is best to use for investigating the composition of food dyes in sweet colours? [8f-44]
1. distillation
2. evaporation
3. filtration
4. chromatography
Which method of separation is best to use for purifying water containing small quantities of dissolved minerals? [8f-45]
1. distillation
2. evaporation
3. filtration
4. chromatography
Which method of separation is best to use for obtaining fertiliser crystals from neutralising nitric acid solution with the alkali ammonia? [8f-46]
1. distillation
2. evaporation
3. filtration
4. chromatography
Which method of separation is best to use for separating a solid product (precipitate) formed from mixing two aqueous solutions? [8f-47]
1. distillation
2. evaporation
3. filtration
4. chromatography
Which method of separation is best to use for checking which ink was used in a forged cheque? [8f-48]
1. distillation
2. evaporation
3. filtration
4. chromatography
Which word means the 'smallest particle of a substance that cannot be broken down further without losing its properties? [8e-1]
1. atom
2. molecule
3. symbol
4. formula
Which word means 'a larger particle formed by bonding together the smallest particles of substances? [8e-2]
1. atom
2. molecule
3. symbol
4. formula
Which word means the 'shorthand for a chemical element? [8e-3]
1. atom
2. molecule
3. symbol
4. formula
Which word means 'a summary of the number of atoms of each element in a compound? [8e-4]
1. atom
2. molecule
3. symbol
4. formula
Which of these is an element? [8e-5]
1. Cu
2. CO
3. MgO
4. H₂O
Which of these is an element? [8e-6]
1. CoO
2. Mg
3. CO₂
4. NaCl
Which of these is an element? [8e-7]
1. CoO
2. MgS
3. O₂
4. NaCl
Which of these is an element? [8e-8]
1. KCl
2. MgS
3. F₂O
4. P₄
Which of these is a compound? [8e-9]
1. CO₂
2. Co
3. F₂
4. P₄
Which of these is a compound? [8e-10]
1. Co
2. MgO
3. F₂
4. P₄
Which of these is a compound? [8e-11]
1. Fe
2. Co
3. CO
4. H₂
Which of these is a compound? [8e-12]
1. Fe
2. Co
3. Ca
4. H₂O
Which of these is an element? [8e-13]
1. nitrogen
2. carbon monoxide
3. water
4. petrol
Which of these is an element? [8e-14]
1. nitrogen monoxide
2. magnesium
3. water
4. alcohol
Which of these is an element? [8e-15]
1. water
2. magnesium oxide
3. bromine
4. alcohol
Which of these is an element? [8e-16]
1. water
2. magnesium oxide
3. brass
4. copper
Which of these is a compound? [8e-17]
1. carbon monoxide
2. magnesium
3. brass
4. bromine
Which of these is a compound? [8e-18]
1. carbon
2. water
3. copper
4. bromine
Which of these is a compound? [8e-19]
1. carbon
2. phosphorus
3. copper oxide
4. bromine
Which of these is a compound? [8e-20]
1. brass (alloy)
2. phosphorus (red)
3. copper (roofing)
4. ethanol (alcohol)
Which of these words means 'one type of atom only? [8e-21]
1. element
2. compound
3. reactant
4. product
Which word means 'two or more different types of atom combined together? [8e-22]
1. element
2. compound
3. reactant
4. product
s Which word means 'what you start with in a chemical reaction? [8e-23]
1. element
2. compounds
3. reactants
4. products
Which word means 'the result of a chemical reaction? [8e-24]
1. elements
2. compounds
3. reactants
4. products
Which picture represents a mixture of two compound molecules? [8e-29]
Which picture represents molecules of a pure element? [8e-30]
Which picture represents a mixture of molecules of two elements? [8e-31]
Which picture represents a molecule mixture of two elements and one compound? [8e-32]
Which picture represents a mixture of atoms of an element and molecules of a compound? [8e-33]
Which picture represents atoms of a pure element? [8e-34]
Which picture represents a mixture of atoms of an element and molecules of another element? [8e-35]
Which picture represents molecules of a pure compound? [8e-36]
Which picture represents a mixture of atoms of two elements? [8e-37]
Which picture represents a mixture of molecules of an element and molecules of a compound? [8e-38]
Which picture best represents pure water? [8e-39]
Which picture best represents oxygen dissolved in water? [8e-40]
Which material is most likely to consist mainly of one element? [8e-41]
1. 24 carat gold ring
2. duralumin HiFi chassis
3. bronze statue
4. pure quartz crystal
Which material is most likely to consist mainly of one element? [8e-42]
1. duralumin HiFi chassis
2. cylinder of oxygen
3. bronze statue
4. pure quartz crystal
Which material is most likely to consist mainly of one element? [8e-43]
1. duralumin HiFi chassis
2. bronze statue
3. yellow rock sulphur
4. pure quartz crystal
Which material is most likely to consist mainly of one element? [8e-44]
1. brass rivet
2. bronze statue
3. pure quartz crystal
4. silver plate
The product of burning magnesium in air is? [8e-53]
1. magnesium oxide
2. oxygen magneside
3. magnesium hydroxide
4. milk of magnesia
The product of heating an iron-sulphur mixture is called? [8e-54]
1. iron sulfate
2. iron sulfide
3. sulfuric iron
4. sulfide of iron
The product of heating sodium in chlorine is called? [8e-55]
1. sodium chlorate
2. chloro sodium
3. sodium chloride
4. chloric soda
The product of burning hydrogen in air is? [8e-56]
1. oxohydrogen
2. hydrogen peroxide
3. hydrogen hydroxide
4. water
What is formed when carbon burns in excess air? [8e-57]
1. carbon dioxide
2. carbon oxide
3. carbon monoxide
4. oxygen carbonate
What is formed when silvery zinc is heated in green chlorine gas? [8e-58]
1. zinc chlorate
2. zinc chloride
3. chlorozincate
4. chloride of zinc
What is formed after heating a sulphur-copper mixture? [8e-59]
1. copper sulfate
2. sulfonium cuprate
3. copper sulfide
4. sulfate of copper
When copper is heated in a bunsen flame it forms a black solid.
What is the name of the compound formed? [8e-60]
1. copper nitride
2. copper hydroxide
3. copper carbide
4. copper oxide
The formula for sulfuric acid is H₂SO₄.
What is the ratio of H : S : O atoms in the molecule? [8e-61]
1. 2 : 1 : 4
2. 1 : 2 : 4
3. 2 : 4 : 4
4. 2 : 2 : 4
The formula for calcium carbonate is CaCO₃.
What is the ratio of Ca : C : O atoms in the formula? [8e-62]
1. 1 : 3 : 3
2. 1 : 1 : 3
3. 3 : 3 : 1
4. 3 : 1 : 1
The formula for sodium sulphate is Na₂S₂O₃.
What is the ratio of Na : S : O atoms in the formula? [8e-63]
1. 3 : 2 : 2
2. 3 : 3 : 2
3. 2 : 2 : 3
4. 2 : 3 : 3
The formula for copper sulphate is CuSO₄.
What is the ratio of Cu : S : O atoms in the formula? [8e-64]
1. 1 : 4 : 4
2. 4 : 4 : 4
3. 4 : 3 : 4
4. 1 : 1 : 4
Which of the following reactions involves the chemical change ...
two elements ==> compound? [8e-65]
1. zinc + sulphur ==> zinc sulfide
2. oxygen + copper sulfide ==> copper sulphate
3. carbon dioxide + calcium hydroxide ==> calcium carbonate + water
4. water ==> hydrogen + oxygen
Which of the following reactions involves the chemical change ...
element + compound ==> compound? [8e-66]
1. zinc + sulphur ==> zinc sulfide
2. oxygen + copper sulphide ==> copper sulfate
3. carbon dioxide + calcium hydroxide ==> calcium carbonate + water
4. water ==> hydrogen + oxygen
Which of the following reactions involves the chemical change ...
two compounds ==> two compounds? [8e-67]
1. zinc + sulphur ==> zinc sulfide
2. oxygen + copper sulfide ==> copper sulphate
3. carbon dioxide + calcium hydroxide ==> calcium carbonate + water
4. water ==> hydrogen + oxygen
Which of the following reactions involves the chemical change ...
compound ==> two elements? [8e-68]
1. zinc + sulphur ==> zinc sulfide
2. oxygen + copper sulphide ==> copper sulfate
3. carbon dioxide + calcium hydroxide ==> calcium carbonate + water
4. water ==> hydrogen + oxygen
[8e-152] When potassium reacts with sulfur, what compound is formed?
1. potassium sulfate
2. potassium sulfite
3. potassium sulfide
4. potassium oxysulfide
[8e-153] When potassium reacts with oxygen when burning in air, what compound is formed?
1. potassium hydroxide
2. potassium nitride
3. potassium oxide
4. potassium nitrate

STATEMENT about ....	ELEMENT	COMPOUND	MIXTURE
has a fixed melting point?	true or false?	true or false?	true or false?

© Doc Brown's KS3 Chemistry Quiz 7H "Elements, compounds, mixtures and their separation" click [?] (re-edit 03/01/2023)