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5.b A) helium B) mercury C) hydrogen D) silver 2.
3.b A) Each hydrogen atom gains two electrons from the oxygen atom. B) Each hydrogen atom loses two electrons to the oxygen atom. C) There are two atoms of hydrogen in this molecule. D) Two atoms each of hydrogen and oxygen are in this molecule. 3.
5.b A) coefficients B) resultants C) reactants D) products 4.
5.b A) A physical law B) Synthesis C) A chemical equation D) The law of conservation of matter 5.
5.b A) is twice as great as the mass of the reactants B) always equals the mass of the reactants C) is less than the mass of the reactants D) cannot be predicted based on the mass of the reactants 6.
5.b A) matter can be created and destroyed but does not change forms B) in a chemical reaction, matter is not created or destroyed, but is conserved C) in a chemical reaction, efforts should be made to preserve rare elements without changing them D) in a chemical reaction, the final mass of the products is always greater than the starting mass of the reactants 7.
5.b A) precipitates B) reactants C) products D) numbers in front of the chemical formulas 8.
5.b A) 2O2 B) O3 C) 3O D) 3O2 9.
5.b A) 4 B) 1 C) 2 D) 3 10.
5.c A) Endothermic B) Exothermic C) Catalyzed D) Inhibited 11.
5.c A) Catalyzed B) Exothermic C) Inhibited D) Endothermic 12.
5.c A) A letter E appears in boldface type over the arrow. B) The word energy is written as a product. C) The word energy is written as a reactant. D) A Greek letter, gamma, is drawn over the arrow.
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