| Across: |
| 2 |
When hydrogen burns with oxygen in air, you say they have (10,8) to form water. |
| 4 |
Is sodium chloride (salt) a compound? (3) |
| 6 |
To get the salt back from its mixture with water, you must (9) the water by heating. |
| 9 |
After initially heating an iron-sulphur mixture, on removing the bunsen flame the mixture still (5,3) |
| 10 |
This is H2O for water! (7) |
| 11 |
This fizzes with acid to form carbon dioxide and dissolves to form a blue solution. (6,9) |
| 13 |
The number of atoms in the molecule CH4 (4) |
| 14 |
For a particular pure substance, this does not change however you make it! (11) |
| 18 |
The largest percentage element in air. (8) |
| 19 |
The total number of atoms in two oxygen molecules. (4) |
| 22 |
When two chemicals are mixed and heat up and the colour changes, it is a sign that an (8,6) has happened |
| 23 |
The type of non-chemical change when water boils. (8) |
| 26 |
In order to make cylinders of oxygen for hospitals, you must do this to the components of air by fractional distillation. (10) |
| 27 |
The formula of magnesium oxide, but one letter should be strictly lower case! (3) |
| 28 |
A well known metal wire burns with sparks to form this when steel wool is heated strongly in air. (4,5) |
| 29 |
A magnet and colour can (11) between iron and sulphur |
| 32 |
Two different types can combine make a new compound. (4) |
| 34 |
you need this to prove anything in science! (8) |
| 35 |
The total number of atoms in C2H6O2 (3) |
| 36 |
Iron sulphide is an example of this type of substance. (8) |
| 38 |
The number of atoms in H2SO3 (3) |
| 39 |
The number of atoms in NH4Cl (3) |
| 40 |
For carbon this is C (6) |
| 41 |
At this point a substance rapidly turns to a gas. (7) |
| 42 |
The melting point for any pure substance is (5). |
| 44 |
This will separate iron and sulphur before they are heated. (6) |
The BIG
KS3 Science-Chemistry crossword on "Compounds and Mixtures"