gases in the air Crossword

78% of air is made up from me.
An unreactive gas in the air that is a noble gas (hint look at last group).
I am an environmetal problem caused by sulfur dioxide
When metal carbonates are heated, they decompose into a metal oxide and carbon dioxide. the reaction is an example of.......
I make up about 20% of the air and I am used in combustion reactions
Calcium hydroxide solution is used to test for carbon dioxide, what is its common name
This is my formula SO2
When carbon dioxide dissolves in water this type of solution is made
Who am i? CuO
Copperoxide is this colour
Copper can be this colour
The state of oxygen at room temperature
Another word used to describe a combustion reaction
Metal oxides in water make the water slighlty....