1) The number of different elements in calcium carbonate is (CaCO3) ... a) 2 b) 3 c) 4 d) 5 2) The formula for methane is CH4 which of these is true? a) there are 5 atoms b) there are 5 different elements c) there are 3 different elements d) there are 5 different molecules 3) How many atoms in CuSO4? a) 2 b) 3 c) 4 d) 5 e) 6 4) The formula for ammonium sulphate is (NH4)2SO4 How many Hydrogen atoms are there in this formula a) 2 b) 8 c) 1 5) The formula for ammonium sulphate is (NH4)2SO4 How many elements are there in this formula? a) 1 b) 2 c) 3 d) 4 6) The formula for ammonium sulphate is (NH4)2SO4 How many atoms are there in total in this formula? a) 10 b) 9 c) 15 d) 20

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