Deck 16: Chemical Equilibrium

Question 1

In the following equilibrium,when chloride ion is added,the concentration of sodium ion will NaCl(s) Na⁺¹ (aq)+ Cl^-1 (aq)

A)Increase
B)Decrease
C)Remain the same

Answer 1

Decrease

Question 2

In the following equilibrium,when Fe⁺³ ion is added,the concentration of Fe(SCN)⁺² ion will Fe⁺³ + SCN^-1 Fe(SCN)⁺²

A)Increase
B)Decrease
C)Remain the same

Answer 2

Increase

Question 3

The addition of a catalyst to a chemical reaction would change the

A)heat of reaction.
B)enthalpy of the reactants.
C)enthalpy of the products.
D)activation energy.

Answer 3

activation energy.

Question 4

A solution in which equilibrium is reached between dissolved and undissolved solute is

A)saturated.
B)unsaturated.
C)supersaturated.

Question 5

In the following equilibrium,when sodium ion is removed,the concentration of chloride ion will Na⁺¹ (aq)+ Cl^-1 (aq) NaCl (s)

A)Increase
B)Decrease
C)Remain the same

Question 6

In which direction will the point of equilibrium shift when the pressure is increased in the following equilibrium? N₂ (g)+ 3 H₂ (g) 2 NH₃ (g)

A)Shift to the right
B)Shift to the left
C)No shift

Question 7

In which direction will the point of equilibrium shift when temperature is increased in the following equilibrium? 2 SO₃ (g)+ 188 kJ 2 SO₂ (g)+ O₂ (g)

A)Shift to the right
B)Shift to the left
C)No shift

Question 8

In which direction will the point of equilibrium shift when the pressure is decreased in the following equilibrium?
H₂ (g)+ Cl₂ (g) 2 HCl (g)

A)Shift to the right
B)Shift to the left
C)No shift

Question 9

In which direction will the point of equilibrium shift when the volume of the reaction vessel increases in the following equilibrium? 2 CO₂ (g) 2 CO (g)+ O₂ (g)

A)Shift to the right
B)Shift to the left
C)No shift

Question 10

In which direction will the point of equilibrium shift when a catalyst is added to thefollowing equilibrium system? KNO₃ + 34.7 kJ K⁺¹ (aq)+ NO₃^-1 (aq)

A)Shift to the right
B)Shift to the left
C)No shift

Question 11

Which is the common ion when hydrochloric acid is added to a saturated solution of sodium chloride?

A)Hydrogen ion
B)Chloride ion
C)Sodium ion
D)Hydroxide ion

Question 12

In which direction will the point of equilibrium shift when the concentration of iron(III)ion decreases in the following equilibrium? Fe⁺³ (aq)+ SCN^-1 (aq) Fe(SCN)⁺² (aq)

A)Shift to the right
B)Shift to the left
C)No shift

Question 13

According to Le Châtelier's Principle,decreasing the temperature at which the following reaction takes place will N₂O₄ + 58.6 kJ 2NO₂(g)

A)shift the equilibrium to the left.
B)shift the equilibrium to the right.
C)have no effect on the equilibrium.

Question 14

In which direction will the point of equilibrium shift when the volume of the reaction vessel decreases in the following equilibrium? 2 SO₃ (g) 2 SO₂ (g)+ O₂ (g)

A)Shift to the right
B)Shift to the left
C)No shift

Question 15

Equilibrium is reached in a chemical reaction when

A)the reactants are completely consumed.
B)the concentrations of all reactants and products become equal.
C)the rates of the opposing reactions become equal.
D)the forward and reverse reactions stop.

Question 16

In which direction will the point of equilibrium shift when temperature is decreased in the following equilibrium? 2 NO (g)+ O₂ (g) 2 NO₂ (g)+ 113 kJ

A)Shift to the right
B)Shift to the left
C)No shift

Question 17

In which direction will the point of equilibrium shift when a catalyst is added to thefollowing equilibrium system? 2 C (s)+ O₂ (g) 2 CO (g)+ 110 kJ

A)Shift to the right
B)Shift to the left
C)No shift

Question 18

In which direction will the point of equilibrium shift when pressure is increased in the following equilibrium? KCl(s) K⁺¹ (aq)+ Cl^-1 (aq)

A)Shift to the right
B)Shift to the left
C)No shift

Question 19

The main reason for the increase in the rate of reaction as temperature increases is

A)molecules can be closer together to react.
B)the number or frequency of collisions between molecules increases.
C)molecules have less energy to move away from each other.
D)more energy is available to overcome the activation energy.

Question 20

In which direction will the point of equilibrium shift when the concentration of chloride ion increases in the following equilibrium?
NaCl (s) Na⁺¹ (aq)+ Cl^-1 (aq)

A)Shift to the right
B)Shift to the left
C)No shift

Question 21

Which acid ionization constant would indicate the weakest acid?

A)3.5 10^-4
B)1.8 10^-5
C)4.6 10^-4
D)1.5 10^-2

Question 22

In the following equilibrium;as I₂ (g)is added,the concentration of H₂ (g)will H₂ (g)+ I₂ (g) 2 HI (g)

A)increase.
B)decrease.
C)remain the same.

Question 23

Calculate the value of K_eq for the following equilibrium when [ H₂ ] = 0.228 M, [ I₂ ] = 0.228 M,and [ HI ] =1.544 M.
H₂ (g)+ I₂ (g) 2 HI (g)

A)29.7
B)0.0337
C)0.0219
D)45.9

Question 24

Which solubility product constant indicates the least soluble salt?

A)2.8 10^-13
B)9.1 10^-6
C)5.0 10^-13
D)1.1 10^-10

Question 25

What is the [OH^-1] in a 0.01 M KOH solution?

A)1 10^-2 M
B)1 10^-14 M
C)1 10^-7 M
D)1 10^-12 M

Question 26

Which solubility product constant indicates the most soluble salt?

A)5.0 10^-13
B)7.1 10^-9
C)8.3 10^-17
D)2.5 10^-2

Question 27

Which K_eq value indicates the greatest concentration of reactants at equilibrium?

A)6.7 10⁵
B)3.2 10⁹
C)1.4 10^-3
D)3.2 10^-7

Question 28

In the following equilibrium,as volume of the reaction vessel decreases,the point of equilibrium will N₂O₄ (g) 2 NO₂ (g)

A)shift to the right.
B)shift to the left.
C)not shift.

Question 29

What is the [OH^-1] in a 0.0001 M solution of HCl?

A)1 10^-14 M
B)1 10^-10 M
C)1 10^-4 M
D)1 10^-7 M

Question 30

Which acid ionization constant would indicate the strongest acid?

A)3.5 10^-4
B)9.5 10^-8
C)1.5 10^-2
D)1.3 10^-13

Question 31

Which K_eq value indicates the greatest concentration of products at equilibrium?

A)6.7 10⁵
B)3.2 10⁹
C)1.4 10^-3
D)3.2 10^-7

Question 32

What is the [H⁺¹] in a 0.01 M KOH solution?

A)1 10^-2 M
B)1 10^-14 M
C)1 10^-7 M
D)1 10^-12 M

Question 33

For the following reaction: K_eq = .COCl₂ is introduced in a closed container until its concentration is 0.890 M.What will be the concentration of Cl₂(g)once the reaction has reached equilibrium?

A)
B)
C)
D)

Question 34

In the following equilibrium,as HNO₃ is added,the concentration of CrO₄^-2 ion will 2 CrO₄^-2 (aq)+ 2 H⁺¹ (aq) Cr₂O₇^-2 (aq)+ H₂O (l)

A)increase.
B)decrease.
C)remain the same.

Question 35

An aqueous solution of sodium sulfate will be:

A)acidic
B)neutral
C)basic

Question 36

In the following equilibrium;as H₂ (g)is removed,the concentration of HI (g)will
H₂ (g)+ I₂ (g) 2 HI (g)

A)increase.
B)decrease.
C)remain the same.

Question 37

In the following equilibrium,as the concentration of CrO₄^-2 ion increases,the concentration of Cr₂O₇^-2 ion 2 CrO₄^-2(aq)+ 2 H⁺¹(aq) Cr₂O₇^-2(aq)+ H₂O (l)

A)increases
B)decreases
C)remains the same

Question 38

In the following equilibrium,as temperature increases,the point of equilibrium will CO₂ (g)+ 2 H₂O (g)+ 890 kJ CH₄ (g)+ 2 O₂ (g)

A)shift to the right.
B)shift to the left.
C)not shift.

Question 39

What is the [H⁺¹] in a 0.0001 M solution of HCl?

A)1 10^-14 M
B)1 10^-10 M
C)1 10^-4 M
D)1 10^-7 M

Question 40

In the following equilibrium,as volume of the reaction vessel increases,the point of equilibrium will 2 HF (g) H₂ (g)+ F₂ (g)

A)shift to the right.
B)shift to the left.
C)not shift.

Question 41

What is the pH of a 0.140 M HCl solution?

A)0.854
B)13.2
C)0.140
D)3.66

Question 42

What is the pH of a 0.10 M KOH solution?

A)1
B)7
C)13
D)14

Question 43

AgNO₃ is added to a saturated AgI solution until the [Ag⁺¹] is 0.050 M.What is the [I^-1] remaining in the solution? The Ksp of AgI is 8.3 10^-17.

A)0.050 M
B)4.2 10^-18 M
C)1.7 10^-15 M
D)8.3 10^-17 M

Question 44

In aqueous solution the [H⁺¹] is 1.4 10^-4 M.The [OH^-1] in the same solution is

A)1.4 10^-2 M
B)1.4 10^-7 M
C)1.0 10^-7 M
D)7.1 10^-11 M

Question 45

A solution of NaNO₃ would be

A)acidic.
B)basic.
C)neutral.

Question 46

A solution of K₂SO₃ would be

A)acidic.
B)basic.
C)neutral.

Question 47

Which salt would produce a neutral solution?

A)KNO₂
B)NH₄Cl
C)Na₂S
D)KCl

Question 48

What is the pH of a 0.0010 M HCl solution?

A)1.0 X 10^-3
B)3.0
C)11
D)4.0

Question 49

Hydrocyanic acid,HCN,is a weak acid whose K_a value is 4.0 10^-10.What is the [H⁺¹] in a 0.10 M solution of HCN?

A)1 10^-4
B)6.3 10^-6
C)4.0 10^-9
D)1.0 10^-11

Question 50

Hydrocyanic acid,HCN,is a weak acid whose K_a value is 4.0 10^-10.What is the pH of a 0.10 M solution of HCN?

A)1.0
B)5.2
C)9.4
D)10.

Question 51

Which salt would produce an acidic solution?

A)NaCl
B)NH₄Cl
C)KNO₃
D)NaI

Question 52

In aqueous solution the [OH^-1] is 3.0 10^-6 M.The [H⁺¹] in the same solution is

A)1.0 10^-7 M
B)3.3 10^-9 M
C)3.0 10^-6 M
D)3.0 10⁸ M

Question 53

The K_sp of silver iodide is 8.3 10^-17.What is the solubility of silver iodide in g/L?

A)1.5 10^-6
B)1.6 10^-30
C)1.9 10^-14
D)6.1 10^-21

Question 54

Hydrosulfuric acid,H₂S,is a weak acid whose K_a value is 9.5 10^-8.What is the [H⁺¹] in a 4.0 M solution of H₂S?

A)6.0 10^-1 M
B)6.2 10^-4 M
C)4.0 M
D)3.8 10^-7 M

Question 55

The pH of an aqueous solution is 3.2.What is the [ ] in the same solution?

A) M
B) M
C) M
D)10.8 M

Question 56

The K_sp of silver bromide is 5.0 10^-13.What is the solubility of silver bromide in g/L?

A)4.7 10^-23
B)3.0 10^-11
C)1.3 10^-4
D)9.4 10^-11

Question 57

HCl is added to a saturated AgCl solution until the [Cl^-1] is 0.010 M.What is the [Ag⁺¹] remaining in the solution? The K_sp of AgCl is 1.8 10^-10.

A)1.8 10^-10 M
B)1.8 10^-8 M
C)1.8 10^-12 M
D)0.010 M

Question 58

What is the pH of a 0.0500 M NaOH solution?

A)1.30
B)-1.30
C)12.7
D)0.0500

Question 59

Which salt would produce a basic solution?

A)KBr
B)NaNO₂
C)CuCl
D)NH₄Cl

Question 60

Hydrosulfuric acid,H₂S,is a weak acid whose K_a value is 9.5 10^-8.What is the pH of a 4.0 M solution of H₂S?

A)0.60
B)6.2
C)3.5
D)3.2

Question 61

The equilibrium constant can change significantly with a change in

A)concentration.
B)catalyst.
C)temperature.
D)pressure.

Question 62

Calculate the pH of a 0.250 M aqueous solution of HNO₂.The acid dissociation constant,K_a,for HNO₂ is .

A)1.97
B)2.74
C)3.35
D)3.95

Question 63

The magnitude of K_eq depends on

A)initial concentration of reactants.
B)presence of a catalyst.
C)temperature.
D)volume of reaction vessel.

Question 64

Calculate the percent ionization of a 0.200 M aqueous solution of HNO₂ having a pH of 2.80.

A)7.1%
B)1.4%
C)2.0%
D)0.79%

Question 65

A 0.50 M solution of hydrofluoric acid,HF,is 3.6% ionized.The acid ionization constant, K_a,for hydrofluoric acid is

A)3.6 10^-2
B)1.8 10^-2
C)3.2 10^-4
D)6.5 10^-4

Question 66

Calculate the percent ionization of a 0.050 M aqueous solution of HF having a pH of 3.15.

A)1.4%
B)4.9%
C)1.6%
D)6.3%

Question 67

Which solution has the highest pH?

A)0.1 M HNO₂
B)0.1 M HCl
C)0.1 M KOH
D)0.1 M NH₄Cl

Question 68

Which solution has the lowest pH?

A)0.1 M HNO₂
B)0.1 M HCl
C)0.1 M KOH
D)0.1 M NH₄OH

Question 69

What will be the [H⁺¹] in a 0.50 M solution of HClO? The K_a of HClO = 3.5 10^-8.

A)1.8 10^-8 M
B)7.0 10^-8 M
C)1.3 10^-4 M
D)1.9 10^-4 M

Question 70

The mathematical expression for the equilibrium constant of the following reaction is:

A)
B)
C)
D)

Question 71

The sodium salts of all anions listed below yield basic solutions when dissolved in water except

A)fluoride
B)chloride
C)cyanide
D)nitrite

Question 72

What is the pH of a 0.00500 M solution of barium hydroxide?

A)11.7
B)12.0
C)2.00
D)2.30

Question 73

The concentration of hydroxide ions, ,in an aqueous solution is M.The pH of the solution is:

A)1.00
B)4.50
C)9.50
D)3.17

Question 74

The solubility of silver bromide is 7.1 10^-7 M.The K_sp of silver bromide is

A)7.1 10^-5
B)5.0 10 ^-5
C)5.0 10^-13
D)5.0 10^-15

Question 75

The solubility of CaF₂ is 2.14 10^-4 M.The K_sp of CaF₂ is

A)3.92 10^-11
B)4.58 10 ^-8
C)9.80 10^-12
D)2.14 10^-8

Question 76

A 0.20 M solution of the weak acid HA has a [H⁺¹] = 1.4 10^-4 M.The acid ionization constant,K_a,for this acid is

A)9.8 10^-8
B)1.8 10^-5
C)2.0 10^-8
D)7.0 10^-4

Question 77

What is the pH of 0.50 M HClO? The K_a of HClO is 3.5 10^-8.

A)0.30
B)7.5
C)7.8
D)3.9

Question 78

In the following equilibrium;as the pressure is increased,the amount of NO₂ formed will N₂ (g)+ 2 O₂ (g) 2 NO₂ (g)

A)increase.
B)decrease.
C)remain the same.

Question 79

If HCl (aq)is added to a saturated NaCl solution,the [Na⁺¹] will

A)increase.
B)decrease.
C)remain the same.

Question 80

A 0.30 M solution of formic acid,HCHO₂,is 2.4% ionized.The acid ionization constant, K_a,for formic acid is

A)1.7 10^-4
B)7.2 10^-3
C)2.4 10^-2
D)1.6 10^-5