WorksheetsKinetics And
Total questions: 24
Worksheet time: 12mins
Name
Class
Date
1.
Which term is defined as a measure of the disorder of a system?
a)
heat
b)
entropy
c)
kinetic energy
d)
activation energy
2.
Systems in nature tend to undergo changes toward
a)
lower energy and lower entropy
b)
lower energy and higher entropy
c)
higher energy and lower entropy
d)
higher energy and higher entropy
3.
A 1.0-gram piece of zinc reacts with 5 milliliters of HCl(aq). Which of these conditions of concentration and temperature would produce the greatest rate of reaction?
a)
1.0 M HCl(aq) at 20.oC
b)
1.0 M HCl(aq) at 40.oC
c)
2.0 M HCl(aq) at 20.oC
d)
2.0 M HCl(aq) at 40.oC
4.
Which expression represents the ΔH for a chemical reaction in terms of the potential energy, PE, of its products and reactants?
a)
PE of products + PE of reactants
b)
PE of products - PE of reactants
c)
PE of products × PE of reactants
d)
PE of products ÷ PE of reactants
5.
Which factors must be equal in a reversible chemical reaction at equilibrium?
a)
the activation energies of the forward and reverse reactions
b)
the rates of the forward and reverse reactions
c)
the concentrations of the reactants and products
d)
the potential energies of the reactants and products
6.
Given the equation representing a reaction at equilibrium:
N2(g) + 3H2(g) <--> 2NH3(g) + ENERGY
Which change causes the equilibrium to shift to the right?
N2(g) + 3H2(g) <--> 2NH3(g) + ENERGY
Which change causes the equilibrium to shift to the right?
a)
decreasing the concentration of H2(g)
b)
decreasing the pressure
c)
increasing the concentration of N2(g)
d)
increasing the temperature
7.
Adding a catalyst to a chemical reaction results in
a)
a decrease in activation energy and a decrease in the reaction rate
b)
a decrease in activation energy and an increase in the reaction rate
c)
an increase in activation energy and a decrease in the reaction rate
d)
an increase in activation energy and an increase in the reaction rate
8.
Given the potential energy diagram of a chemical reaction: . . . (see image)
Which arrow represents the potential energy of the reactants?
Which arrow represents the potential energy of the reactants?
a)
A
b)
B
c)
C
d)
D
9.
Given the reaction at equilibrium:
2SO2(g) +O2(g) <--> 2SO3(g) + HEAT
Which change will shift the equilibrium to the right?
2SO2(g) +O2(g) <--> 2SO3(g) + HEAT
Which change will shift the equilibrium to the right?
a)
increasing the temperature
b)
increasing the pressure
c)
decreasing the amount of SO2(g)
d)
decreasing the amount of O2(g)
10.
Which process is accompanied by a decrease in entropy?
a)
boiling of water
b)
condensing of water vapor
c)
subliming of iodine
d)
melting of ice
11.
Given the reaction at 25oC:
Zn(s) + 2 HCl(aq) --> ZnCl2(aq) + H2(g)
The rate of this reaction can be increased by using 5.0 grams of powdered zinc instead of a 5.0-gram strip of zinc because the powdered zinc has
Zn(s) + 2 HCl(aq) --> ZnCl2(aq) + H2(g)
The rate of this reaction can be increased by using 5.0 grams of powdered zinc instead of a 5.0-gram strip of zinc because the powdered zinc has
a)
lower kinetic energy
b)
lower concentration
c)
more surface area
d)
more zinc atoms
12.
A solution that is at equilibrium must be
a)
concentrated
b)
dilute
c)
saturated
d)
unsaturated
13.
Given the reaction:
N2(g) +O2(g) +182.6 KJ <--> 2 NO(g)
Which change would cause an immediate increase in the rate of the forward reaction?
N2(g) +O2(g) +182.6 KJ <--> 2 NO(g)
Which change would cause an immediate increase in the rate of the forward reaction?
a)
increasing the concentration of NO(g)
b)
increasing the concentration of N2(g)
c)
decreasing the reaction temperature
d)
decreasing the reaction pressure
14.
In a potential energy diagram, the difference between the potential energy of the products and the potential energy of the reactants is equal to the
a)
heat of reaction
b)
entropy of the reaction
c)
activation energy of the forward reaction
d)
activation energy of the reverse reaction
15.
Which sample has the greatest entropy?
a)
NH3(g)
b)
NH3(l)
c)
NH3(s)
d)
NH3(aq)
16.
An open flask is half filled with water at 25oC. Phase equilibrium can be reached after
a)
more water is added to the flask
b)
the flask is stoppered
c)
the temperature is decreased to 15oC
d)
the temperature is increased to 35oC
17.
Given the accompanying potential energy diagram for a reaction:
Which interval on this diagram represents the difference between the potential energy of the products and the potential energy of the reactants?
Which interval on this diagram represents the difference between the potential energy of the products and the potential energy of the reactants?
a)
1
b)
2
c)
3
d)
4
18.
Given the reaction at equilibrium:
C2 + D2(g) <-->2 CD(g) + energy
Which change will cause the equilibrium to shift?
C2 + D2(g) <-->2 CD(g) + energy
Which change will cause the equilibrium to shift?
a)
increase in pressure
b)
increase in volume
c)
addition of heat
d)
addition of a catalyst
19.
A sample of helium gas is in a sealed, rigid container. What occurs as the temperature of the sample is increased?
a)
The mass of the sample decreases
b)
The number of moles of gas increases.
c)
The volume of each atom decreases.
d)
The frequency of collisions between atoms increases.
20.
Given the potential energy diagram for a chemical reaction:
(see image)
Which numbered interval represents the heat of reaction?
(see image)
Which numbered interval represents the heat of reaction?
a)
1
b)
2
c)
3
d)
4
21.
Given the equation representing a reaction:
N2O4(g) <--> 2NO2(g)
Which statement describes this reaction at equilibrium?
N2O4(g) <--> 2NO2(g)
Which statement describes this reaction at equilibrium?
a)
The concentration of N2O4(g) must equal the concentration of NO2(g).
b)
The concentration of N2O4(g) and the concentration of NO2(g) must be constant.
c)
The rate of the forward reaction is greater than the rate of the reverse reaction.
d)
The rate of the reverse reaction is greater than the rate of the forward reaction.
22.
Given the potential energy diagram and equation representing the reaction between substances A and D: (see accompanying diagram)
According to Table I, substance G could be
According to Table I, substance G could be
a)
HI(g)
b)
H2O(g)
c)
CO2(g)
d)
C2H6(g)
23.
Which list of the phases of H2O is arranged in order of increasing entropy?
a)
ice, steam, and liquid water
b)
ice, liquid water, and steam
c)
steam, liquid water, and ice
d)
steam, ice, and liquid water
24.
For a given reaction, adding a catalyst increases the rate of the reaction by
a)
providing an alternate reaction pathway that has a higher activation energy
b)
providing an alternate reaction pathway that has a lower activation energy
c)
using the same reaction pathway and increasing the activation energy
d)
using the same reaction pathway and decreasing the activation energy
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