Chem 104 Final Exam 2024. Questions and
Correct Answers With Complete Solution, Updated
2024/2025.
When the rate of the forward reaction equals the rate of the reverse reaction, the net concentrations
of all species do not change and the system is at _________.
equilibrium
The energy of activation is the minimum amount of energy needed for a reaction to take place and is
often called _____ that must be crossed.
energy barrier
According to the law of conservation of energy, the _______ energy in the universe does not change.
Therefore, _____ cannot be created or destroyed.
total
Energy
When energy is absorbed, the reaction is said to be ______ and (triangle)H is ______. Since energy is
absorbed, the products are ____ in energy than the reactans.
endothermic
positive
higher
The capacity to do work is referred to as the ________.
energy
Heat is ______.
Released
The enthalpy change (triangle)H is _______
negative
The bonds formed in the _____ are stronger than the bonds broken in the ______.
products
reactants
The products are ____ in energy than the reactants.
lower
A slow reaction is an incomplete reaction.
,False
A slow reaction may go to completion but take a longer period of time
The rates of forward and reverse reactions are never the same.
False
The rates of forward and reverse reactions are equal in a dynamic equilibrium situation
There are two types of energy --_____ energy is stored energy and _____ energy is the energy of
motion?
potential
kinetic
A compound with _____ potential energy is more stable than a compound with higher potential
energy.
lower
When energy is released, the reaction is said to be _____ and (triangle)H is _____. Since energy is
released, the products are _____ in energy than the reactants.
exothermic
negative
lower
The unstable energy maximum located at the top of the energy hill in an energy diagram is the
_______.
transition state
The difference in energy between the reactants and the transition state is the _____, which is
symbolized by _____
energy of activation
Ea
The magnitude of the _____ determines the reaction rate -- how fast the reactions occurs.
energy of activation
Use Le Chatelier's Principle to predict whether the amount of PCl3 in a 1.00-L container increases,
decreases, or remains the same for the equilibrium.
PCl3(g) + Cl2(g) <-> PCl5(g) + heat
when each of the following changes is made. Click in the answer box to display choices.
Cl2 is added.
PCl3 ______
decreases
, Determine the sign of (triangle)G for the following reaction. Is the reaction spontaneous, non
spontaneous, or temperature dependent?
47 kcal + 2SO3(g) -> 2SO2(g) + O2(g)
This is spontaneous, non spontaneous
Temperature dependent
Is the following process exothermic or endothermic?
S(s) + O2(g) -> SO2(g), (triangle)H = -71 kcal
exothermic
Use LeChatelier's principle to predict the effect, if any, of adding a catalyst to the equilibrium system,
described below, in a closed container. Select the single best answer.
C(s) + 2H2(g) <-> CH4(g) + 18 kcal
Not effect
Will an increase in pressure increase, decrease, or have no effect on the concentration of H2(g) in the
following reaction?
C(s) + H2O (g) <-> CO(g) + H2(g)
Decrease
Classify NH3 as a Bronsted acid, Bronsted base or both?
Bronsted base
In the Arrhenius definition, _____ are substance that contain hydroxide and dissolve in water to form -
OH
bases
A _____ is proton donor
Bronsted-Lowery acid
A _____ is the product formed by the loss of a proton by an acid
conjugate BASE
A _____ is the solution that has an equal concentration of hydronium and hydroxide ions and a pH = 7
neutral solution
An amphoteric compound contains both a ______ atom and a _____ of electrons so that it can be
either an acid or a base.
hydrogen
Lone pair
The _____ constant is the product of the concentration of hydronium ion and hydroxide ion in water or
an aqueous solution and is symbolized by _____
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