16.1) A catalyst is a. a reactant in a chemical reaction. b. a product in a chemical reaction. c. a substance that speeds up a reaction without being consumed in the reaction. d. a substance that increases the energy of the products. e. a substance that decreases the energy of the products.

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Hubert KochLv2

17 Dec 2019

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The best description of how a catalyst makes a reaction proceed at a faster rate is a. A catalyst increases the kinetic energy of the reactant particles. b. A catalyst provides an alternate path for the reaction and effectively lowers the activation energy. c. A catalyst lowers the average energy of the product molecules. d. A catalyst changes the position of equilibrium by shifting the reaction towards the products. e. A catalyst raises height of the energy barrier required for reaction.

2 A(g) + B(g) Î 2 C(g)

When the concentration of substance B in the reaction above is doubled, all other factors being held constant, it is found that the rate of the reaction remains unchanged. The most probable explanation for this observation is that (A) the order of the reaction with respect to substance B is 1. (B) substance B is not involved in any of the steps in the mechanism of the reaction. (C) substance B is not involved in the rate-determining step of the mechanism, but is involved in subsequent steps. (D) substance B is probably a catalyst, and as such, its effect on the rate of the reaction does not depend on its concentration. (E) the reactant with the smallest coefficient in the balanced equation generally has little or no effect on the rate of the reaction.

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16.1) A catalyst is a. a reactant in a chemical reaction. b. a product in a chemical reaction. c. a substance that speeds up a reaction without being consumed in the reaction. d. a substance that increases the energy of the products. e. a substance that decreases the energy of the products.

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