In general, slow reactions
a. are exothermic.
b. are endothermic.
c. have low activation energies.
d. have high activation energies.
[Ques. 2] Which of the following statements is not true?
a. Displacement has a direction and a magnitude.
b. Acceleration has a magnitude only.
c. Speed has a magnitude only.
d. Velocity has a magnitude and a direction.
[Ques. 3] What basic type of reaction is illustrated by the general equation AB + CD AD + BC?
a. Combination
b. Decomposition
c. Double-replacement
d. Single-replacement
[Ques. 4] The distance traveled by a dropped object in free fall is directly proportional to
a. the time squared.
b. its weight.
c. its mass.
d. none of these.
[Ques. 5] What basic type of reaction is illustrated by the general equation A + BC B + AC?
a. Combination
b. Decomposition
c. Double-replacement
d. Single-replacement
[Ques. 6] An object that is moving with an acceleration different from zero will always have a(n) ______________ velocity.
a. changing
b. increasing
c. constant
d. decreasing
[Ques. 7] What basic type of reaction is illustrated by the general equation A + B AB?
a. Combination
b. Decomposition
c. Double-replacement
d. Single-replacement
[Ques. 8] A freely falling object has a constant acceleration of 9.8 m/s2 . This means that
a. the object's displacement changes by 9.8 m every second squared.
b. the object's speed increases by 9.8 m/s each second.
c. the object's acceleration increases by 9.8 m/s2 each second.
d. the object travels 9.8 m each second.
[Ques. 9] What basic type of reaction is illustrated by the general equation AB A + B?
a. Combination
b. Decomposition
c. Double-replacement
d. Single-replacement
[Ques. 10] An object is dropped from a vertical distance of 25.5 m above the ground, and it takes 2.28 sec to fall that distance. A second identical object to launched from the same height, with a horizontal velocity of 45.9 m/s. How long does the second object take to fall the 25.5 m?
a. More than 2.28 sec
b. Almost 2.28 sec.
c. Less than 2.28 sec
d. Exactly 2.28 sec
e. Much less than 2.28 sec
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