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# the equilibrium constants

In the graph, energy is plotted as a function of reaction progress for a catalyzed and an uncatalyzed chemical reaction. Assign the terms to their corresponding features in the figure.
Energy is plotted on the y axis versus the reaction progress on the x axis. There are two curves. Both curves start at the same energy, rise to a maximum energy and decrease to the same final energy. The final energy is lower than the initial energy. The maximum energy of the red (top) curve is greater than the maximum energy of the blue (botton) curve.
answer bank: activation energy , products, reactants
2.
How are the following aspects of a reaction affected by the addition of a catalyst?
Increased. Decreased. Not affected
answer bank: rate of the reverse reaction, activation energy of the reverse reaction, activation energy of the forward reaction, rate of the forward reaction
What other aspects of a catalyzed reaction are different from the uncatalyzed reaction?
THE MECHANISM
THE OVERALL REACTION
Δ𝐸RXN

## the equilibrium constants

3.
At 25 °C, only 0.0490 mol of the generic salt AB3 is soluble in 1.00 L of water.
What is the 𝐾sp of the salt at 25 °C?
AB3(s)↽−−⇀A3+(aq)+3B−(aq)
𝐾SP=
4.
The 𝐾sp of copper(II) carbonate, CuCO3, is 1.4×10−10. Calculate the molar solubility, 𝑆, of this compound.
𝑆=
M
5.
The 𝐾sp of iron(II) hydroxide, Fe(OH)2, is 4.87×10−17. Calculate the molar solubility, 𝑠, of this compound.
𝑠=
M
6.
Complete the 𝐾sp expression for Ag2CO3.
𝐾sp=8.46×10−12=
7.
Enter the solubility-product expression for Al(OH)3(s).
𝐾sp=
8.
For each event, indicate how the concentration of each species in the chemical equation will then change to reach equilibrium. An up arrow indicates an increase in concentration, a down arrow indicates a decrease in concentration, and leaving it blank means there is no change in the concentration.
2CO(g) + O2(g) ↽−−⇀ 2CO2(g)
increasing the concentration of CO
increasing the concentration of CO2
decreasing the volume of the system
9.
Consider the reaction.
PCl5(g)↽−−⇀PCl3(g)+Cl2(g)𝐾c=0.0420
The concentrations of the products at equilibrium are [PCl3]=0.260 M and [Cl2]=0.180 M. What is the concentration of the reactant, PCl5, at equilibrium?
[PCL5]=
M
10.
For the reaction
2H2O(g)↽−−⇀2H2(g)+O2(g)
the equilibrium concentrations were found to be [H2O]=0.250 M, [H2]=0.340 M, and [O2]=0.750 M.
What is the equilibrium constant for this reaction?
𝐾C=
11.
For the reaction
2H2O(g)↽−−⇀ 2H2(g)+O2(g)
the equilibrium concentrations were found to be [H2O]=0.250 M, [H2]=0.560 M, and [O2]=0.800 M. What is the equilibrium constant for this reaction?
𝐾EQ=
12.
Write the equilibrium constant expression for the reaction
A(s)+3B(l)↽−−⇀2C(aq)+D(aq)
in terms of [A], [B], [C], and [D] as needed.
𝐾eq=
13.
Write the equilibrium-constant expression for the reaction shown in terms of [A], [B], [C], and [D].
3A(g)+B(g)↽−−⇀2C(g)+2D(g)
Note that 𝐾c, which is sometimes symbolized as 𝐾 or 𝐾eq, denotes that the equilibrium constant is expressed using molar concentrations. For this question, 𝐾c means the same thing as 𝐾 and 𝐾eq.
𝐾c=
14.
Write the equilibrium-constant expression for the reaction shown in terms of [NO], [O2], and [NO2].
2NO(g)+O2(g)↽−−⇀2NO2(g)
𝐾c, which is sometimes symbolized as 𝐾 or 𝐾eq, denotes that the equilibrium constant is expressed using molar concentrations. For this question, 𝐾c means the same thing as 𝐾 and 𝐾eq.
𝐾c=