1
				2											3
													4
	5										6
									7
					8		9
10
							11
12

Across 2. We make sure all variable except one are changed in experiments to make sure the test is _____________ 5. A substance that contains atoms of 2 or more elements combined together chemically 7. These contain only one type of atom 10. Results become this when the experiment is repeated to the identify and remove unusual results 11. a molecule made of just 2 atoms e.g. chlorine gas Cl2 12. The temperature at which a liquid becomes a gas i.e. evaporates

Down 1. This is made up of 2 or more elements and / or compounds not chemically combined. 3. Ammonia diffuses faster then hydrogen chloride gas because it is ___________ 4. The smallest particle that can have a separate independent existence e.g. H2O water 5. This describes the number of particles in a given volume and is measured in moles per cubic decimeter. 6. The temperature at which a solid becomes a liquid 8. the movement of a gas from a high concentration to a low concentration. 9. An example of a mixture