Chemical Reactions

4. When magnesium is burnt is air it emits energy as a bright ........
6. When electricity is passed through water the gases released are hydrogen and .........
7. The chemicals required for the reaction
8. The name of the gas released when metals react with acid
9. When electricity is passed through water, the reaction is known as .............
11. A very reactive metal that explodes when placed in water
12. The number of atoms in water
14. These reactions do not form new substances
16. The name of the process converting vapour into liquid form
18. Reactions that burn fuels and oxygen to generate heat
19. These reactions make new substances
21. These reactions take in heat
22. The opposite to an acid
23. A reaction forming a sludge from two soluble solutions
26. The name of the process converting water into gas
27. The name of the main gas used to fuel bunsen burners

1. The chemicals formed after the reaction
2. When magnesium is burnt in air, it forms magnesium .......
3. These reactions generate heat
5. dioxide The name of the gas formed when an acid reacts with a carbonate is known as …………. dioxide
9. The name of a reaction that forms a gas
10. The name of a chemical that contains much energy
13. This type of reaction breaks down big molecules into smaller ones
15. When small molecules or atoms are combined to make bigger molecules
17. A blue soluble salt known as copper ...........
20. Shells and marble are made of ......... carbonate
24. The chemist's heat source
25. My official name is dihydrogen oxide
28. This is often released in exothermic reactions