The rate of a chemical reaction would be increased by
a. increasing the surface area of the reactants.
b. increasing the concentration of the reactants.
c. adding a catalyst to the reactants.
d. heating the reactants.
e. all of the above.
[Ques. 2] A golfer hits a ball on a level fairway at an angle of 30 relative to the horizontal, and it lands on the green. Another golfer hits a ball with the same speed but at an angle of 60, and it lands on the green by the other ball. Which statement is accurate for this situation?
a. One ball is in the air longer than the other.
b. One ball experiences a greater acceleration while in free flight.
c. One ball experiences a smaller acceleration while in free flight.
d. Two balls hit at the same speed but different angles will always land in the same location.
e. Two balls hit at the same speed but different angles can never land in the same location.
[Ques. 3] The rate of a chemical reaction would be decreased by
a. stirring the reactants.
b. increasing the concentration of the reactants.
c. adding a catalyst to the reactants.
d. cooling the reactants.
[Ques. 4] A golfer hits a ball on a level fairway at an angle of 60 relative to the horizontal, and it lands on the green. Another golfer hits a ball with the same speed but at another angle, and it lands on the green by the other ball. What was the launch angle for the second golfer?
a. 30
b. 20
c. 45
d. 40
e. 10
[Ques. 5] For an endothermic reaction, the energy barrier is ______________ on the reactant side than on the product side.
a. greater
b. not different in size
c. smaller
[Ques. 6] In projectile motion, which of the following is not constant?
a. Vertical velocity
b. Horizontal velocity
c. Acceleration
d. None of these
[Ques. 7] For an exothermic reaction, the energy barrier is ______________ on the reactant side than on the product side.
a. smaller
b. not different in size
c. greater
[Ques. 8] A projectile's horizontal velocity component (ignoring air resistance)
a. does not change.
b. changes most rapidly near the bottom of its trajectory.
c. changes at a variable rate.
d. changes at a constant rate.
[Ques. 9] When carbon combines with oxygen, energy is released to the surroundings. Thus this reaction
a. is an acidbase reaction.
b. is endothermic.
c. never reaches equilibrium.
d. is exothermic.
[Ques. 10] A projectile's vertical velocity component
a. changes most rapidly near the top of its trajectory.
b. changes at a constant rate.
c. changes most rapidly near the bottom of its trajectory.
d. does not change.
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