Chemistry Revision

2. Unsaturated hydrocarbons containing at least one carbon-carbon double bond
4. The minimum amount of energy that particles must have to react (________ energy)
7. To increase the rate of reaction you need more ______ collisions
9. Breaking a solid reactant into smaller pieces increases this, making the reaction faster. (7,4)
10. A substance made of only one type of atom.
11. _________ theory that states particles must bump into each other with enough energy to react
13. Gases like carbon dioxide and methane that trap heat in the atmosphere are called _______ gases
14. The solid or liquid mixture of two or more substances that are not chemically bonded.
16. Compounds containing only hydrogen and carbon ato
17. The law of _______ of mass states that no atoms are made or lost during a chemical reaction.
19. A reaction that takes in energy from the surroundings, causing a temperature drop

1. Saturated hydrocarbons with the general formula CnH{2n+2}
3. A resource, like fossil fuels, that is being used up faster than it can be replaced.
5. Two or more elements chemically combined together
6. A complex mixture of hydrocarbons formed over millions of years from ancient biomass
8. A substance that speeds up a chemical reaction without being used up itself
10. A biological catalyst, often made of protein.
12. The thermal decomposition process used to break long-chain alkanes into smaller, more useful molecules.
15. A separation technique used to distinguish different dyes or pigments in an ink
18. A resource that can be replenished at a rate equal to or faster than its consumption
20. A reaction that releases energy to the surroundings, causing a temperature rise.