5 Written Questions

1. How do scientists make an informed guess about the mechanism of a reaction?
2. A catalyst is __________ at the end of a reaction.
3. The rate law describes the way __________ concentration affects reaction rate.
4. Enzymes are large _______________ molecules found in nature.
5. Catalysts generally affect chemical reactions by providing an alternative pathway for a lower ___________.

5 Matching Questions

1. decrease; concentration
2. The slope indicates how fast a quantity is changing with time.
3. It is the process in which an increase in reaction rates is caused by the presence of a catalyst.
4. pressure
5. A reaction will occur if the species involved in a collision have sufficient energy and if they are oriented correctly towards each other.

1. a Reactio rates _____ with times because the reaction rate depends on the _____ of the reactant.
2. b Changing the ____________ of a gas is another way of changing the concentration.
3. c What factors determine whether a molecular collision produces a reaction?
4. d What does the slope of a line in a reaction rate graph tell us?
5. e What is catalysis?

5 Multiple Choice Questions

1. If doubling the concentration of a reactant quadruples the rate of the reaction, the concentration of the reactant appears in the rate law with an exponent of __________.
   1. one
   2. 2
   3. rate
   4. protein
2. The definition of rate does not apply to__________.
   1. reactant
   2. surface reactions
   3. surface
   4. concentration
3. Why do reactions in chemical kinetics need to be measured frequently?
   1. Frequent measurements are necessary because the ·t only measures small time intervals.
   2. The slope indicates how fast a quantity is changing with time.
   3. Compare the rate ratio with a concentration ratio.
   4. A reaction rate is the decrease in the concentration of a reactant during a small time interval, divided by the duration of that interval and by the corresponding coefficient in the chemical equation.
4. Doubling the pressure of a gas ______________ its concentration.
   1. decrease
   2. rate
   3. doubles
   4. one
5. If a ________________ between molecules is very gentle, the molecules are more likely to rebound without reacting.
   1. protein
   2. catalysis
   3. collision
   4. doubles

5 True/False Questions

1. Doubling the pressure of a gas doubles its concentration and, thus, will increase the rate of a reaction. → How do you find a reaction order?

   True        False

2. A reaction rate is the decrease in the concentration of a reactant during a small time interval, divided by the duration of that interval and by the corresponding coefficient in the chemical equation. → What is the reaction order?

   True        False

3. It is an expression of the rate of a chemical reaction in terms of concentration. → How do you find a reaction order?

   True        False

4. catalysis → If a ________________ between molecules is very gentle, the molecules are more likely to rebound without reacting.

   True        False

5. Compare the rate ratio with a concentration ratio. → How do you find a reaction order?

   True        False