1) The part of the chemical equation that is on the left side. a) reactants b) products c) coefficients d) subscripts e) yields sign 2) The arrow means? a) makes b) produces c) yields d) all of the above 3) In order for a chemical equation to be balanced, the total number of atoms of each element must be the same on both sides of the equation. a) true b) false 4) Is this equation balanced? 2CO + H2O yields 2OCH a) Yes b) No 5) Is this equation balanced?  CH4 + 2O2 yields CO2 + 2H2O a) Yes b) No 6) Is this equation balanced? P4O10 + H2O yields H3PO4 a) Yes b) No 7) Is this equation balanced? C3H8 + O2 yields H2O + CO 2 a) Yes b) No 8) Is this equation balanced? N2 + 3H2 yields 2NH3 a) Yes b) No 9) What does the coefficient tell you? a) How many formulas there are b) How many atoms there are c) How many molecules there are 10) Why is it important that a chemical equation be balanced? a) So you won't explode the chemistry lab. b) Because you can't make or destroy atoms c) Because of the Law of Conservation of Mass/Matter d) Both B and C 11) What is the composition of water H2O a) one hydrogen and two oxygens b) Two oxygen and one hydrogen? c) 2 hydrogens and two oxygens d) 2 hydrogens and one oxygen 12) What does the "2" mean in this formula? H2O a) it tells you how many hydrogen atoms b) it tells you how many oxygen atoms. c) it tells you it is 2 years old

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