1
					2							3
							4
		5
6														7
				8
				9
			10			11					12
		13
14

Across 4. The gas with the highest concentration in the air 6. What forms when sulfur burns in air (2 Words) 8. What copper forms when it is heated in air (2 Words) 9. The element that burns with a bright white flame 12. The gas that is about 21% of the air 13. Metal oxides have a pH above 7, so are this 14. What forms when carbon burns in plenty of air (2 Words)

Down 1. What iron oxide is 2. The product formed when hydrogen burns with oxygen 3. What forms when magnesium burns in air (2 Words) 5. The colour of copper oxide 6. The element that burns with a bright blue flame in air 7. The colour of copper carbonate 10. The element that burns with a bright yellow/ orange flame and forms a colourless gas 11. Non-metal oxides have a pH below 7, so are this