Year 10 science revision

3. a change in a substance that does not change the identify of the substance
9. positively charged particle
11. a change in a substance that results in a new substance being formed
14. increasing the dissolved reactants increases the ...
16. a quick reaction
17. the rate of reaction depends on the ______________ of collisions between particles
18. a substance that lowers the reactions activation energy so speeds up the reaction

1. the minimum amount of energy needed for the particles to react
2. the type of reaction where a molecule breaks down to make simpler ones
3. a solid that forms
4. the type of reaction where two or more compounds combine to form one compound
5. the speed of a reaction
6. negatively charged ion
7. charge on a ionic compound
8. the smaller the pieces of reactant the ______________ the surface area
10. substances that are formed in a chemical reaction
12. a substance that is made of two or more elements bonded together
13. the measure of how well one substance dissolves in another
15. by increasing this the particles have more energy so they collide more