1) What is the best way to be certain that a chemical reaction has occurred? a) Some bubbles form. b) The materials do not react. c) A new substance forms. d) A color change occurs. 2) Which of the following is a balanced equation? a) 2H2O2 → 2H2O + O3 b) 2H2O2 → 2H2O + 2O2 c) 2H2O2 → 2H2O + O2 d) H2O2 → 2H2O + O 3) All atoms that are present at the beginning of a chemical reaction are present at the end of the reaction. This supports... a) Law of conservation of energy b) Law of conservation of mass c) Atomic mass theory d) Law of momentum 4) How do the masses demonstrate the law of conservation of mass? a) The reactants have different masses. b) The sum of the masses of the reactants equals the mass of the product. c) The mass of the product is the difference of the mass of the reactants. d) The masses of each of the substances remain the same.

Chemical Reactions

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