practice exam revision questions on hydrocarbob fuels combustion equations octane number for students doing AQA, Edexcel, OCR, WJEC, CIE and CCEA advanced A level chemistry courses © Doc Brown's chemistry

Which of the following cyclic molecules is an arene (aromatic)? [dfmc-1]
1. molecule W
2. molecule X
3. molecule Y
4. molecule Z
Which of the following cyclic molecules is an alkane? [dfmc-2]
1. molecule W
2. molecule X
3. molecule Y
4. molecule Z
Which of the following cyclic molecules is an alkene? [dfmc-3]
1. molecule W
2. molecule X
3. molecule Y
4. molecule Z
Which of the following cyclic molecules is an ether? [dfmc-4]
1. molecule W
2. molecule X
3. molecule Y
4. molecule Z
Which of the following conversions corresponds to a 'reforming' process? [dfmc-5]
1. heptane to methylbenzene
2. heptane to 3-methylhexane
3. heptane to propene and butane
4. heptane to 2,2,3-trimethylbutane
Which of the following conversions corresponds to a 'cracking' process? [dfmc-6]
1. heptane to methylbenzene
2. heptane to 3-methylhexane
3. heptane to propene and butane
4. heptane to 2,2,3-trimethylbutane
Which of the following conversions corresponds to an 'isomerisation' process? [dfmc-7]
1. heptane to methylbenzene
2. heptane to heptene
3. heptane to propene and butane
4. heptane to 2,2,3-trimethylbutane
Which four numbers a, b, c and d are required to balance the equation ...
a CH_4(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfmc-8]
1. 1 2 1 2
2. 1 1 1 2
3. 1 2 2 1
4. 1 1 1 1
Which four numbers a, b, c and d are required to balance the equation ...
a C₂H_6(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfmc-9]
1. 1 2 1 3
2. 2 7 4 6
3. 2 4 4 6
4. 1 7 2 3
Which four numbers a, b, c and d are required to balance the equation ...
a C₃H_8(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfmc-10]
1. 1 3 3 4
2. 2 10 4 6
3. 1 5 3 4
4. 2 5 2 3
Which four numbers a, b, c and d are required to balance the equation ...
a C₄H_10(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfmc-11]
1. 1 13 8 4
2. 2 7 4 10
3. 1 5 3 4
4. 2 13 8 10
Which four numbers a, b, c and d are required to balance the equation ...
a C₅H_12(l) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfmc-12]
1. 1 8 5 6
2. 1 4 4 6
3. 2 4 5 12
4. 2 8 10 12
Which four numbers a, b, c and d are required to balance the equation ...
a C₆H_14(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfmc-13]
1. 2 9 6 14
2. 2 19 12 14
3. 1 9 6 7
4. 1 10 12 7
Which four numbers a, b, c and d are required to balance the equation ...
a C₇H_16(l) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfmc-14]
1. 1 5 7 8
2. 2 12 14 16
3. 1 11 7 8
4. 2 11 14 16
Which four numbers a, b, c and d are required to balance the equation ...
a C₈H_18(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfmc-15]
1. 1 13 8 18
2. 1 13 8 9
3. 2 13 16 18
4. 2 25 16 18
Which four numbers a, b, c and d are required to balance the equation ...
a C₂H_4(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfmc-16]
1. 1 3 2 2
2. 1 2 2 2
3. 2 3 4 4
4. 2 6 4 4
Which four numbers a, b, c and d are required to balance the equation ...
a C₃H_6(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfmc-17]
1. 2 5 6 6
2. 2 9 6 6
3. 1 5 3 3
4. 1 9 3 3
Which four numbers a, b, c and d are required to balance the equation ...
a C₄H_8(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfmc-18]
1. 2 12 8 8
2. 2 6 8 8
3. 1 6 4 4
4. 1 3 4 4
Which four numbers a, b, c and d are required to balance the equation ...
a C₇H_8(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfmc-19]
1. 2 9 4 8
2. 2 10 14 8
3. 1 5 7 4
4. 1 9 7 4
Which of the following molecules has the highest boiling point? [dfmc-20]
Which of the following molecules has the lowest octane rating? [dfmc-21]
Which of the following molecules has the lowest boiling point? [dfmc-22]
Which of the following molecules has the highest octane rating? [dfmc-23]
Which of the following molecules has the highest boiling point? [dfmc-24]
Between which of the following molecules do you get hydrogen bonding? [dfmc-25]
Which word means breaking larger alkane molecules into smaller ones? [dfmc-26]
1. polymerisation
2. cracking
3. reforming
4. isomerisation
Which word means changing changing the structural formula of a molecule without changing the molecular formula? [dfmc-27]
1. polymerisation
2. isomerisation
3. reforming
4. cracking
Which word means changing open chain alkanes into cycloalkanes and arenes? [dfmc-28]
1. polymerisation
2. isomerisation
3. reforming
4. cracking
What word means breaking down larger hydrocarbons into smaller ones? [dfsa-1]
What word describes producing a more branched hydrocarbon from a straight chain one of same molecular formula? [dfsa-2]
What word describes the petrochemical industry process of converting straight chain alkanes into cycloalkanes, cycloalkenes and aromatics? [dfsa-3]
What is the molecular formula of ? [dfsa-4]
Which four numbers a, b, c and d are required to balance the equation ... (enter the LOWEST WHOLE NUMBERS with SPACES between them)
a CH_4(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfsa-5]
Which four numbers a, b, c and d are required to balance the equation ... (enter the LOWEST WHOLE NUMBERS with SPACES between them)
a C₂H_6(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfsa-6]
Which four numbers a, b, c and d are required to balance the equation ... (enter the LOWEST WHOLE NUMBERS with SPACES between them)
a C₃H_8(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfsa-7]
Which four numbers a, b, c and d are required to balance the equation ... (enter the LOWEST WHOLE NUMBERS with SPACES between them)
a C₄H_10(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfsa-8]
Which four numbers a, b, c and d are required to balance the equation ... (enter the LOWEST WHOLE NUMBERS with SPACES between them)
a C₅H_12(l) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfsa-9]
Which four numbers a, b, c and d are required to balance the equation ... (enter the LOWEST WHOLE NUMBERS with SPACES between them)
a C₆H_14(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfsa-10]
Which four numbers a, b, c and d are required to balance the equation ... (enter the LOWEST WHOLE NUMBERS with SPACES between them)
a C₇H_16(l) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfsa-11]
Which four numbers a, b, c and d are required to balance the equation ... (enter the LOWEST WHOLE NUMBERS with SPACES between them)
a C₈H_18(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfsa-12]
Which four numbers a, b, c and d are required to balance the equation ... (enter the LOWEST WHOLE NUMBERS with SPACES between them)
a C₂H_4(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfsa-13]
Which four numbers a, b, c and d are required to balance the equation ... (enter the LOWEST WHOLE NUMBERS with SPACES between them)
a C₃H_6(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfsa-14]
Which four numbers a, b, c and d are required to balance the equation ... (enter the LOWEST WHOLE NUMBERS with SPACES between them)
a C₄H_8(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfsa-15]
Which four numbers a, b, c and d are required to balance the equation ... (enter the LOWEST WHOLE NUMBERS with SPACES between them)
a C₇H_8(g) + b O_2(g) ==> c CO_2(g) + d H₂O_(l) ? [dfsa-16]
Given the equation for the complete combustion of ethylbenzene ...
2C₈H_10(g) + 21O_2(g) ==> 16CO_2(g) + 10H₂O_(l)
what volume, in cm³, of oxygen, is needed to completely burn 10cm³ of vaporised ethylbenzene? (all gas volumes are measured at the same temperature and pressure) [dfsa-17]
Given the equation for the complete combustion of ethylbenzene ...
2C₈H_10(g) + 21O_2(g) ==> 16CO_2(g) + 10H₂O_(l)
what volume, in cm³, of carbon dioxide, is formed on completely burning 20cm³ of vaporised ethylbenzene? (all gas volumes are measured at the same temperature and pressure) [dfsa-18]
Given the equation for the complete combustion of ethylbenzene ...
2C₈H_10(g) + 21O_2(g) ==> 16CO_2(g) + 10H₂O_(l)
what volume, in cm³, of air, is needed to completely burn 30cm³ of vaporised ethylbenzene? (all gas volumes are measured at the same temperature and pressure, assume air is 21% oxygen) [dfsa-19]
Given the equation for the complete combustion of ethylbenzene ...
2C₈H_10(g) + 21O_2(g) ==> 16CO_2(g) + 10H₂O_(l)
what volume, in cm³, of ethylbenzene, is burned completely by 3dm³ of air? (all gas volumes are measured at the same temperature and pressure, assume air is 21% oxygen) [dfsa-20]
Given the equation for the complete combustion of ethylbenzene ...
2C₈H_10(g) + 21O_2(g) ==> 16CO_2(g) + 10H₂O_(l)
what volume, in cm³, of ethylbenzene, is burned completely by 225 cm³ of air? (3 sig fig answer, all gas volumes are measured at the same temperature and pressure, assume air is 21% oxygen) [dfsa-21]

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