QUIZ 1. Why does heat help aid in the occurrence of a chemical reaction? a. It cause molecules to line up in the right orientation. b. It weakens chemical bonds. c. It allows for more mixing of reactants. d. It increases the kinetic energy of the reactants Answer: d. Heat will increase the kinetic energy of the reactants, increasing the chance of collisions between the molecules in the reaction. 2. What is true of the activation energy in an exothermic reaction? a. It will be a negative number in this type of reaction b. It is independent of the fact that the reaction is exothermic c. It will be zero in an exothermic reaction d. It will contribute to the change in enthalpy of the reaction if positive Answer: b. The activation energy in an exothermic reaction is independent of the fact that the reaction is exothermic. 3. In what type of reaction is heat the primary end product? a. Combustion reaction b. Precipitation reaction c. Decomposition reaction d. Neutralization reaction Answer: a. A combustion reaction is basically a burning of a combustible product with heat as the major end-product.
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