Mr Sir

6. the number of active molecules in a set volume of solution
10. an object or a substance that can be broken down by bacteria, fungi and other living organisms.
11. reaction a reaction used to produce solid products from solutions of ionic substances
12. this refers to an acid solution with a high concentration of hydrogen ions
16. a reaction that involves oxygen and releases light and heat energy
18. a theory stating that the particles involved in a chemical reaction must collide in order to react
20. a reaction that involves the breakdown of a compound into simpler substances
21. a substance that increases the rate of a reaction but is not used up in the reaction

1. an acid which most of its molecules release hydrogen ions into solution
2. a strong acid readily releases a hydrogen ion in a chemical reaction; can also be used to describe the bond between different atoms
3. a reaction in which an acid and a base combine to produce a metal salt and water
4. a small molecule from which polymers are made
5. a molecule that contains only carbon and hydrogen atoms
7. a reaction that involves the combination of oxygen with a fuel or metal
8. a small number of active molecules (such as acid) in a solution
9. rate how fast or slow a reaction proceeds
11. an insoluble compound formed in a precipitation reaction
13. a long-chain molecule formed by the joining of many smaller repeating molecules (monomers)
14. a mixture of solute dissolved in a solvent such as water
15. a reaction that involves the building up of compounds by combining simpler,normally elements
17. process of joining smaller units(monomers) to form a long-chain molecule (polymer)
19. an ion that does not take part in a chemical reaction