Samuels PS Kinetics Question Preview (ID: 31558)
Physical Science Kinetics.
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The kinetic energy needed for molecules to chemically react is known as _____.
a) activation energy
b) concentration
c) potential energy
d) catalyst
If the concentration is increased the reaction rate will:
a) increase
b) decrease
c) stay the same
d) there is not enough information
In order to increase reaction rate by increasing surface area of a solid, which of the following would you do?
a) make the pieces smaller by grinding them
b) make the pieces bigger by clumping them
c) increase the pressure
d) decrease the temperature
What is a substance that alters the rate of a chemical reaction without being permanently changed in the chemical reaction?
a) catalyst
b) reactant
c) product
d) coefficient
In a chemical reaction, if the reaction occurs backward and forward at the same time and rate then the system is said to be at ________.
a) equilibrium
b) inefficient
c) incomplete
d) balanced
What is not true of a catalyst?
a) increases activation energy
b) lowers the activation energy
c) written over the arrow
d) increases rate of reaction
A decrease in temperature will do what to a chemical reaction?
a) slow it down
b) speed it up
c) equalize it
d) nothing
In gases increasing pressure will increase the rate of reaction. Which factor does it fall under?
a) surface area
b) temperature
c) activation energy
d) concentration
If a reaction is at equilibrium the amount of the chemicals:
a) remain constant
b) increase
c) decrease
d) get used up
Why does increasing the kinetic energy of molecule make a reaction faster?
a) there are more collisions
b) there is more disorder
c) there are less molecules
d) there are more molecules
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