Select all of the correct statements about reaction rates from the choices below. 1. The lower the rate of a reaction the longer it takes to reach completion. 2. The rate of a slow step has more effect on the overall reaction rate than the rate of a fast step. 3. Reaction rates decrease with increasing temperature. 4. As a reaction progresses its rate goes down.

A catalyst increases the activation energy required for a reaction to proceed. True False

Which of the following statements is the best explanation of how activation energy affects the rate of a chemical reaction?   A. A high activation energy means molecules have less kinetic energy and hence rate of reaction will be slower.   B. A high activation energy means molecules must have more kinetic energy to overcome it, and hence rate of reaction will be faster.   C. A high activation energy means molecules have a lot of kinetic energy and hence rate of reaction will be faster.     D. A high activation energy means molecules must have less kinetic energy to overcome it, and hence rate of reaction will be slower.   E. A high activation energy means molecules must have more kinetic energy to overcome it, and hence rate of reaction will be slower.

%23 Consider a hypothetical chemical reaction: A+B → C+D (In this equation A, B, C and D stand for some unknown chemical formulas.) Here is an energy diagram for the reaction: 400 300 energy 200 (k]/mol) C + D 100 - A + B reaction coordinate Use the energy diagram to answer these questions. What is the heat of reaction? O KJ/mol O Exothermic Is the reaction exothermic or endothermic? O Endothermic O Neither 00 O Yes, it's kJ/mol Can you determine the activation energy? Explanation Check O 2021 McGraw-Hill Education. AI Rightseserve Terms of MacBook Air 30 88 esc F10 F7 F6 F9 F1 F2 F3 F5 @ #3 24 % & 8. 6.