Choose one substance from the list that fits the given description: barium sulphate, copper, calcium hydroxide, carbon dioxide, hydrogen, oxygen, calcium oxide, ammonium chloride, diamond. You may use each substance once, more than once or not at all.

1. aan acidic oxide [1]
2. bused to dry ammonia [1]
3. ca salt prepared by precipitation [1]
4. da macromolecule [1]
5. eWhich two substances from the list would react to form ammonia when heated together? [2]
6. fWhich two substances would react to only form a compound with a molar mass of 18 g? [1]

You'll mark your own answer against the marking guide when you hand it in.