# Chemical Equilibrium

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## Chemical Equilibrium Answer Key

1.

For the equilibrium, [math]A harr 2B + Heat[/math], the number of A molecules increases if

- volume is increased.
- temperature is increased.
- catalyst is added.
- concentration of 2B is decreased.

2.

Consider the following gas-phase reaction

aA(g) + bB(g) [math]harr[/math] cC(g) + dD(g)

What is its partial pressure equilibrium constant expression?

aA(g) + bB(g) [math]harr[/math] cC(g) + dD(g)

What is its partial pressure equilibrium constant expression?

- [math]K_p = (p_C)^c (p_D)^d[/math][math][/math]
- [math]K_p = (p_A)^a (p_B)^b[/math]
- [math]K_p = (p_C)^c (p_D)^d// (p_A)^a (p_B)^b[/math][math][/math][math][/math]

3.

The degree of dissociation of a weak base is inversely proportional to the square root of its concentration and directly proportional to the square root of the volume of solution.

4.

Which of the following equations correctly presents Ostwald's dilution equation for a weak acid?

Assume the following in answering this question:

[math]alpha[/math]= degree of dissociation of the acid

[math]K_a = [/math] acid dissociation constant

V = Volume of the acidic solution

[math]alpha[/math] is very small

Assume the following in answering this question:

[math]alpha[/math]= degree of dissociation of the acid

[math]K_a = [/math] acid dissociation constant

V = Volume of the acidic solution

[math]alpha[/math] is very small

- [math]K_a = alpha^2//V[/math][math][/math]
- [math]K_a = alphaV[/math][math][/math]
- [math]K_a = alpha^3V[/math]
- [math]K_a = alpha^3//V[/math]

5.

When volume of the equilibrium reaction, [math]C(s) + H_2O (g) harr CO (g) + H_2(g)[/math], is increased at constant temperature, the equilibrium will

- shift from left to right.
- shift from right to left.
- be unaffected.
- not be predicted.

6.

The equilibrium, [math]H_2O (l) harr H^+(aq) + OH^[-] (aq)[/math], is

- dynamic.
- static.
- physical.
- mechanical.

7.

For the equilibrium, [math]Cl_2(g) + 2NO (g) harr 2NOCl(g)[/math], the concentration of NOCl will increase if the equilibrium is disturbed by

- adding [math]Cl_2[/math].
- removing NO.
- adding NOCl.
- removal of [math]Cl_2[/math].

8.

According to Le-Chatelier's principle, if an external stress is applied to a reacting system at equilibrium, the system will adjust itself in such a way that the effect of the stress is nullified

9.

Strong electrolytes have a degree of dissociation that is essentially equal to one.

- True
- False

10.

Which of the following parameters does not affect the position of equilibrium in a chemical reaction?

- concentration
- pressure
- volume
- catalyst

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