1 A) rust B) iron C) water D) oxygen 2 A) The products are less stable. B) The products are more stable. C) The energy released is always in the form of heat. D) The bonds of the products have more energy than those of the reactants. 3 A) catalyst B) exotherm C) endotherm D) inhibitor 4 A) chemical formula B) concentration C) atomic number D) activation energy 5 A) Speed B) Age C) A balanced chemical equation D) A rate 6 A) is less than the mass of the reactants B) is twice as great as the mass of the reactants C) cannot be predicted based on the mass of the reactants D) always equals the mass of the reactants 7 A) chemical fusion B) chemical change C) nuclear reaction D) physical change 8 A) The law of conservation of matter B) A chemical equation C) Synthesis D) A physical law 9 A) how stable the compound is B) how electrons are arranged C) what type of chemical bond it forms D) what elements it contains 10 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 11 A) The solid products weigh the same as the reactants. B) The number of reactants is equal to the number of products. C) There are the same number of atoms of each element on both sides of the equation. D) The reactants and the products are written with the same coefficients. 12 A) products B) resultants C) reactants D) coefficients 13 A) inhibitor B) catalyst C) endotherm D) enzymes 14 A) energy of catalyzation B) energy requirement C) activation energy D) energy of inhibition 15 A) oxygen and water B) hydrogen peroxide C) hydrogen and oxygen D) hydrogen oxide 16 A) The bonds of the reactants have more energy than those of the products. B) The reactants are less stable. C) The energy supplied is always in the form of electricity. D) The reactants are more stable. 17 A) reactants B) numbers in front of the chemical formulas C) products D) precipitates 18 A) The word energy is written as a product. B) The word energy is written as a reactant. C) A Greek letter, gamma, is drawn over the arrow. D) A letter E appears in boldface type over the arrow. 19 A) stop B) continue at the same rate C) speed up D) slow down 20 A) Catalyzed B) Endothermic C) Inhibited D) Exothermic
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