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) The formula for methane is CH4 How many hydrogen atoms are in methane? a) 1 b) 2 c) 3 d) 4 e) 5 4) How many oxygen atoms in CuSO4? a) 2 b) 3 c) 4 d) 5 e) 6 5) How many copper atoms in CuSO4? a) 1 b) 2 c) 4 d) 5 e) 6 6) How many atoms altogether in CuSO4? a) 1 b) 2 c) 4 d) 5 e) 6 7) How many calcium atoms in Ca(OH)2 a) 1 b) 2 c) 4 d) 5 e) 6 8) How many oxygen atoms in Ca(OH)2 a) 1 b) 2 c) 4 d) 5 e) 6 9) How many hydrogen atoms in Ca(OH)2 a) 1 b) 2 c) 4 d) 5 e) 6 10) How many sodium atoms in Na2SO4 a) 1 b) 2 c) 3 d) 4 e) 5 f) 6 11) How many nitrogen atoms in Ca(NO3)2 a) 1 b) 2 c) 3 d) 4 e) 5 f) 6 12) How many oxygen atoms in Ca(NO3)2 a) 1 b) 2 c) 3 d) 4 e) 5 f) 6

Yr10 Chemical Formulae

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