1) How many elements are in NaCl? a) 2 b) 4 c) 3 d) 6 2) There are how many atoms in this chemical formula - CH3CHOHCH3 a) 3 b) 12 c) 6 d) 10 3) A ____________________ is made up of two or more atoms joined tightly together. a) Atom b) Carbon c) Molecule d) Formula 4) A _______________ is a substance whose molecules contain atoms of different elements.  a) Compound b) Molecule c) Atom 5) Water molecules contain the atoms of two different elements. Those elements are ____________ and ____________. a) Water and Helium b) Hydrogen and Oxygen c) Hydrogen and Iron d) Carbon and Dioxide 6) What elements are in the compound for baking soda? (use your Compounds Notes) a) Sodium, Hydrogen, Carbon, Oxygen b) Carbon, Hydrogen, Oxygen c) Hydrogen, Sulful, Oxygen 7) What is the small number to the right of a chemical symbol called? a) Prefix b) Subscript c) Atom d) Compound 8) How many total atoms are in the compound H2O2? a) 4 b) 2 c) 8 d) 3 9) How many different elements are in the compound H3PO4? a) One b) Four c) Three d) Two 10) How many total atoms are in sulfuric acid? H2SO4 a) 3 b) 6 c) 5 d) 7 11) The ______________ unit of a compound is a molecule. a) smallest b) largest c) medium sized 12) If there is NO number next to an element in a compound, how many atoms does that element have? a) 1 b) 0 c) 2

Molecules & Compounds Practice

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