WorksheetsU7L1E1: Explaining Equilibrium
Total questions: 15
Worksheet time: 15mins
Name
Class
Date
1.
This symbol indicates that a reaction is ____________
a)
reversible
b)
irreversible
2.
When the system X + 2 Y <=> Z has reached equilibrium, which of the following is TRUE?
a)
Forward reaction and Backward reaction stop.
b)
Forward reaction has sped up and backward reaction has slowed down.
c)
Forward and backward reactions occur at the same rate.
d)
Forward reaction has slowed down and backward reaction has sped up.
3.
At what time the reaction reached equilibrium?
a)
t1
b)
t2
c)
t3
d)
t4
4.
For the reaction...
N2 + O2 <=> 2NO
If O2 is removed, the concentration of N2 will _______.
N2 + O2 <=> 2NO
If O2 is removed, the concentration of N2 will _______.
a)
increase
b)
decrease
c)
remain the same
d)
double
5.
In an exothermic reaction energy is transferred from
a)
reactants to their surroundings
b)
the surroundings to reactants
c)
one reactant to another
d)
the container to the chemicals
6.
Identify the incorrect statement about achieving equilibrium.
a)
achieved when product and reactant concentrations are equal
b)
achieved when forward and reverse reaction rates are same
c)
achieved when concentration of reactants is stable/constant
d)
achieved when concentration ratio of reactants to products becomes stable, thus fixing the equilibrium constant (equilibrium position)
7.
When the rate of the forward reaction is equal to the rate of backward reaction, the system is said to be in
a)
Chemical Equilibrium
b)
Chemical Balance
c)
Chemical Constant
d)
Chemical Reaction
8.
It is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back.
a)
reversible reaction
b)
irreversible reaction
c)
decomposition reaction
d)
synthesis
9.
Identify the labels (a) and (b) on the graph.
a)
a is concentration of reactants and b is the concentration of product
b)
a is concentration of product and b is the concentration of reactant
c)
a is the volume of reactants and b is the volume of product
d)
a the mass of reactants and b is the mass of product
10.
Define chemical equilibrium.
a)
A reaction is reversible.
b)
The concentration of the reactants is equal to the concentration of the products.
c)
The rate of a forward reaction is equal to the rate of the reverse reaction.
d)
The reaction stops and no further change in concentration occurs.
11.
During equilibrium, the rates of the forward and the reverse reaction are ________
a)
the same
b)
unequal
c)
unequal for exothermic reactions
d)
unequal for endothermic reactions
12.
2A + 3B <----> 2AB
The forward reaction forms the substance __________.
The forward reaction forms the substance __________.
a)
A
b)
B
c)
AB
d)
A + B
13.
For the reaction...
H2 (g) + Cl2 (g) <−> 2HCl (g) + heat
If the temperature is cooled, the _________ reaction will be favored.
H2 (g) + Cl2 (g) <−> 2HCl (g) + heat
If the temperature is cooled, the _________ reaction will be favored.
a)
forward
b)
reverse
c)
forward and reverse
14.
For the reaction...
heat + N2 + O2 <−> 2NO
If the heat is removed from the chemical system, the concentration of N2 will _______.
heat + N2 + O2 <−> 2NO
If the heat is removed from the chemical system, the concentration of N2 will _______.
a)
increase
b)
decrease
c)
remain the same
d)
double
15.
Which of the following is the condition needed to establish the equilibrium?
a)
Constant Temperature
b)
Products and reactants should be in constant dynamic motion
c)
All reactants and products should be in closed system
d)
All of the above
100 %
