Increased temperature usually leads to an increase in reaction rate because collisions are
a. more violent only.
b. more frequent only.
c. both more violent and more frequent.
d. none of these
[Ques. 2] If the speed of an object in circular motion is increased by a factor of 3, its centripetal acceleration for the same radius will be multiplied by a factor of
a. 0.111.
b. 0.333.
c. 1.73.
d. 9.
e. 3.
[Ques. 3] Increased reactant concentration usually leads to an increase in reaction rate, because collisions are
a. more violent only.
b. more frequent only.
c. both more violent and more frequent.
d. none of these
[Ques. 4] The magnitude of the acceleration of an object moving in a circle at constant speed is
a. inversely proportional to the speed squared.
b. inversely proportional to the speed.
c. inversely proportional to the radius of the circle squared.
d. inversely proportional to the radius of the circle.
[Ques. 5] A substance that increases the rate of a chemical reaction but is not consumed in the reaction is called
a. an oxidizing agent.
b. a catalyst.
c. an activation agent.
d. a reducing agent.
[Ques. 6] The direction of the acceleration of an object moving in a circle at constant speed is
a. changing, but pointing in a predictable direction.
b. constant and pointing in only one direction.
c. constant and pointing in two directions.
d. none of these
[Ques. 7] When the equation Ga + Br2 GaBr3 is balanced, the total of all the coefficients (both written and understood) is
a. 4.
b. 3.
c. 6.
d. 7.
[Ques. 8] The magnitude of the acceleration of an object moving in a circle at constant speed is
a. variable.
b. directly proportional to the speed squared.
c. directly proportional to the speed.
d. directly proportional to the radius of the circle squared.
[Ques. 9] The coefficients needed to balance the equation Ga + Br2 GaBr3 are, respectively,
a. 4, 3, and 2.
b. 2, 3, and 2.
c. 1, 3, and 2.
d. 2, 1, and 2.
[Ques. 10] Centripetal means
a. center seeking
b. pulls outward
c. constant
d. fast
e. none of these
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