7F Simple Chemical Reactions
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| 1. | A chemical reaction has taken place if there is a change in ..... | | 4. | Carbon dioxide gas is given off when acid is added to limestone, otherwise known as calcium ..... (9 letters) | | 6. | Metals react with Acids to produce this gas. The test for it is the squeak pop test (8 letters) | | 8. | Substances which react together in a chemical reaction. You write them on the LEFT side of the reaction. (9 letters) | | 10. | When carbon dioxide is bubbled through lime water it turns ... (5 letters) | | 11. | These are given off, sometimes with a fizzing noise, showing that a chemical reaction is taking place (7 letters) | | 12. | The metal magnesium burns in air with a brilliant white flame to produce this compound (2 words: 9 letters, 5 letters) | | 14. | You can often tell that a chemical reaction is taking place by touching the outside of a test tube and feeling the ... given off (4 letters) | | 15. | Highly reactive metal which burns in air with a brilliant white flame (9 letters) | | 16. | Gas you breathe out, which turns lime water milky (2 words: 6 letters, 7 letters) | | 19. | Chemical reactions cannot usually be undone, they are ..... (12 letters) | | 20. | Reacts with metal to produce hydrogen gas (4 letters) | | 21. | Clear liquid which turns milky when carbon dioxide is bubbled through it (2 words: 4 letters, 5 letters) | | 23. | Gas you breathe out, easily seen on a cold day (2 words: 5 letters, 6 letters) |
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| 2. | The reactive part of air (6 letters) | | 3. | A change which is reversible (eg screwing up a piece of paper) (8 letters) | | 5. | Physical changes can be undone, they are .... (10 letters) | | 7. | Type of change which is irreversible (8 letters) | | 9. | Yellow powder which burns in oxygen with a purple flame to produce choking sulphur dioxide (7 letters) | | 13. | Acidic, choking gas, produced by burning a sulphur in oxygen (2 words: 7 letters, 7 letters) | | 17. | Hydrogen gas is given off when an acid reacts with a .... (4 letters) | | 18. | Reactants are written on the LEFT side of a chemical equation. What are written on the RIGHT side? (8 letters) | | 22. | Neither solid nor liquid. Often indicates a chemical reaction is taking place (3 letters) |
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