CHEM 135 EXAM 2
1. What is the order of the reaction if the concentration doesn't change butthe rate changes?:
Zero order
2. What is the order of the reaction if the concentration doubles and the ratequadruples?:
Second order
3. What is the plot of rate (often in units of M/s) vs. concentration for azero-order reaction?:
Slope is a constant (straight horizontal line). y=k
4. What is the plot of rate (often in units of M/s) vs. concentration for afirst-order reaction?:
Positive, linear graph. y=kx
5. What is the plot of rate (often in units of M/s) vs. concentration for asecond-order
reaction?: Positive, quadratic graph. y=kx^2
6. Integrated rate law for zero-order reactions (recognize, not memorize): [5t4=] 5X5a + [54]0
7. Integrated rate law for first-order reactions (recognize, not memorize): ln[5t4]
=5X
ln5[5a4+]0
8. Integrated rate law for second-order reactions (recognize, not memorize)-
: (1/[A]t)=kt+(1/[A]0)
9. Half-life: The time required for the concentration of a reactant to fall to half of itsinitial
value
10. What is the relationship between T1/2 and [A]0 in zero-order reactions?: -
T1/2 increases as [A]0 increases
11. What is the relationship between T1/2 and [A]0 in first-order reactions?: -
T1/2 and [A]0 are not related
12. What is the relationship between T1/2 and [A]0 in second-order reactions?-
: T1/2 decreases as [A]0 increases
13. For a reaction to occur between colliding molecules...: The total kinetic energy of the
molecules must be greater than or equal to the activation energy. Molecules must have correct
orientation as well.
1. What is the order of the reaction if the concentration doesn't change butthe rate changes?:
Zero order
2. What is the order of the reaction if the concentration doubles and the ratequadruples?:
Second order
3. What is the plot of rate (often in units of M/s) vs. concentration for azero-order reaction?:
Slope is a constant (straight horizontal line). y=k
4. What is the plot of rate (often in units of M/s) vs. concentration for afirst-order reaction?:
Positive, linear graph. y=kx
5. What is the plot of rate (often in units of M/s) vs. concentration for asecond-order
reaction?: Positive, quadratic graph. y=kx^2
6. Integrated rate law for zero-order reactions (recognize, not memorize): [5t4=] 5X5a + [54]0
7. Integrated rate law for first-order reactions (recognize, not memorize): ln[5t4]
=5X
ln5[5a4+]0
8. Integrated rate law for second-order reactions (recognize, not memorize)-
: (1/[A]t)=kt+(1/[A]0)
9. Half-life: The time required for the concentration of a reactant to fall to half of itsinitial
value
10. What is the relationship between T1/2 and [A]0 in zero-order reactions?: -
T1/2 increases as [A]0 increases
11. What is the relationship between T1/2 and [A]0 in first-order reactions?: -
T1/2 and [A]0 are not related
12. What is the relationship between T1/2 and [A]0 in second-order reactions?-
: T1/2 decreases as [A]0 increases
13. For a reaction to occur between colliding molecules...: The total kinetic energy of the
molecules must be greater than or equal to the activation energy. Molecules must have correct
orientation as well.
