The small crossword on "Compounds and Mixtures" @ doc brown's KS3 chemistry

FOR PRINTING OUT ONLY, answers found via KS3 chemistry link above
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Across:

1. This fizzes with acid to form carbon dioxide and dissolves to form a blue solution. (6,9)
5. Two different types can combine make a new compound. (4)
6. For carbon this is C (6)
7. A well known metal wire burns with sparks to form this when steel wool is heated strongly in air. (4,5)
12. You need this to prove anything in science! (8)
14. You cannot split this into a simpler substances but 92 of them naturally occur! (7)
16. The largest percentage element in air. (8)
20. Iron sulphide is an example of this type of substance. (8)
21. A well known compound is doing this below 0oC! (8)
22. This is H2O for water! (7)
23. Shiny silvery grey magnetic solid until you heat it with sulphur. (4)
24. A (8)? reaction makes new substances.

Down:

1. For a particular pure substance, this does not change however you make it! (11)
2. The type of non-chemical change when water boils. (8)
3. To get the salt back from its mixture with water, you must (9) the water by heating.
4. The element made by photosynthesis. (6)
8. This will separate iron and sulphur before they are heated. (6)
9. At this point a substance rapidly turns to a gas. (7)
10. The gases in air are an example. (7)
11. A chemical (8)? happens if you heat a mixture of iron and sulphur.
13. At this (7) point at 120oC sulphur changes from a yellow solid to a yellow-brown liquid.
15. Hydrogen, oxygen and water are all examples of this type of particle. (8)
17. After initially heating an iron-sulphur mixture, on removing the bunsen flame the mixture still (5,3)
18. When two different elements are chemically (8)? they form a compound.
19. A yellow solid, not magnetic and not ph!. (6)