1) The number of Hydrogen atoms is........ a) 1 b) 2 c) 4 2) How many Carbon atoms? a) 1 b) 7 c) 49 d) 14 3) How many Sulphur ( S ) atoms? a) 1 b) 3 c) 12 d) 14 4) How many Mg atoms? a) 3 b) 6 c) 9 5) How many Oxygen atoms? a) 4 b) 12 c) 24 6) What is the ratio of H : O atoms? a) 1 : 4 b) 4 : 2 c) 2 : 4 7) What do the letters indicate in a chemical formula? a) The number of atoms b) The type of atoms

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