1) Which of the models best represents one molecule of NH3 ? a) b) c) d) e) 2) The chemical formula for calcium carbonate is CaCO3. Which of the models best represents one molecule of calcium carbonate? a) b) c) d) e) 3) How many atoms of carbon (C) are in NaHCO3 ? a) 1 b) 2 c) 3 d) 4 4) How many atoms of each element are in one molecule of CH3CH2OH ? a) 1 atom of carbon, 1 atom of hydrogen and 1 atom of oxygen b) 2 atoms of carbon, 1 atom of hydrogen and 6 atoms of oxygen c) 2 atoms of carbon, 6 atoms of hydrogen and 1 atom of oxygen d) 6 atoms of carbon, 2 atoms of hydrogen and 1 atom of oxygen 5) How many atoms total are in H2SO4 ? a) 1 b) 3 c) 6 d) 7 e) 9 f) 11 6) How many atoms total are in C6H13NO2 ? a) 4 b) 20 c) 22 d) 24 7) How many hydrogen (H) atoms are in 2 C4H8O ? a) 2 b) 4 c) 8 d) 13 e) 16 8) How many atoms total are in 2 C4H8O ? a) 2 b) 4 c) 8 d) 13 e) 26 9) How many molecules total are in 2 C4H8O ? a) 2 b) 4 c) 8 d) 13 e) 26 10) How many oxygen (O) are in Mg(OH)2 ? a) 1 b) 2 c) 3 d) 5 11) How many atoms total are in Ca3(PO4)2 ? a) 3 b) 8 c) 12 d) 13 e) 16 12) How many molecules total are in Ca3(PO4)2 ? a) 1 b) 3 c) 4 d) 13 e) 16 13) How many atoms of phosphorus (P) are in 3 Ca3(PO4)2 ? a) 1 b) 2 c) 3 d) 4 e) 6 f) 13

Counting Atoms

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