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Simple chemical reactions crossword

Across
What is made in a a chemical reaction. (7)
A hard form of limestone used to make statues. (6)
Acid used to make a nitrate salt. (6)
A salt made when a base reacts with sulphuric acid. (7)
This has two oxygen atoms per molecule. (7)
Chemical reaction between an acid and an alkali. (14)
This is called natural gas, and is used in our Bunsen burners. (7)
A way of writing down a chemical reaction (4,8). (12)
A starting substance in a chemical reaction. (8)
Down
A salt made when a base reacts with hydrochloric acid. (8)
A chemical compound containing oxygen and one other element. (5)
Oil, gas and coal (6,4). (10)
Very difficult to take in the other direction. (12)
A gas which is made when a metal carbonate and acid react. (6,7) (13)
A gas which is made when a metal and acid react. (8)
A word that means burning. (10)
Acid rain results from the burning of this yellow element. (7)
Element in milk needed for strong, healthy bones. (7)
Compounds containing only a metal, carbon and oxygen. (9)