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PS_BalEq&Vocab
  • 1. Which of the following describes the rule that mass is neither created nor destroyed during a chemical reaction (this is why we have to balance chemical equations)?
A) Law of Chemistry
B) Law of Gravity
C) Law of Conservation of Mass
D) Law of Evolution
  • 2. Which of the following is described as a short, easy way to show a chemical reaction, using symbols instead of words?
A) chemical formula
B) chemical symbol
C) chemical reaction
D) chemical equation
  • 3. Which of the following desribes a substance that enters into a chemical reaction?
A) product
B) yield
C) reactant
D) coefficient
  • 4. Which of the follwing describes a substance that is formed as a result of a chemical reaction?
A) yield
B) product
C) reactant
D) subscript
  • 5. Which of the following describes a number placed in front of a chemical formula in an equation that indicates how many atoms or molecules of each reactant and product are involved in a reaction?
A) precipitate
B) subscript
C) coefficient
D) superscript
  • 6. Which of the following describes a number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound?
A) precipitate
B) subscript
C) superscript
D) coeffiecient
  • 7. Balance the following equation on your own sheet of paper. ___SnO2 + ___H2 --> ___Sn + ___H2O. AFTER you have completely balanced the equation, read the following choices, and choose the one that is TRUE.
A) The coefficient in front of SnO2 on the reactants side is 2.
B) The coefficient in front of H2 on the reactants side is 1.
C) The coefficient in front of H2O on the products side is 1.
D) The coefficient in front of H2 on the reactants side is 2.
  • 8. Balance the following equation on your own sheet of paper. ___Mg + ___O2 --> ___MgO. AFTER you have completely balanced the equation, read the following choices, and choose the one that is TRUE.
A) The coefficient in front of the MgO on the products side is 1.
B) The coefficient in front of the O2 on the reactants side is 3.
C) The coefficient in front of the O2 on the reactants side is 2.
D) The coefficient in front of the Mg on the reactants side is 2.
  • 9. Balance the following equation on your own sheet of paper. ___Li + ___O2 --> ___Li2O. AFTER you have completely balanced the equation, read the following choices, and choose the one that is TRUE.
A) The coefficient in front of the O2 on the reactants side is 3.
B) The coefficient in front of the Li2O on the products side is 1.
C) The coefficient in front of the Li on the reactants side is 4.
D) The coefficient in front of the O2 on the reactants side is 2.
  • 10. Balance the following equation on your own sheet of paper. ___ScF3 + ___K --> ___Sc + ___KF. AFTER you have completely balanced the equation, read the following choices, and choose the one that is TRUE.
A) When the equation is balanced, the number of Potassium atoms (K) is 3 on both the reactants and products sides.
B) When the equation is balanced, the number of Fluorine atoms (F) is 1 on both the reactants and products sides.
C) When the equation is balanced, the number of Scandium atoms (Sc) is 2 on both the reactants and products sides.
D) When the equation is balanced, the number of Potassium atoms (K) is 1 on both the reactants and products sides.
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