Higher Chemistry Unit 3 Section 3 Equilibrium Multiple Choice Questions This is designed to be used...

Higher ChemistryHigher Chemistry

Unit 3Section 3 EquilibriumMultiple Choice Questions

This is designed to be used by teachers to help students develop skills in answering multiple choice questions.

Douglas Racey, Waid Academy, Anstruther, Fife, Scotland

Higher Chemistry Unit 3 - Section 3 Higher Chemistry Unit 3 - Section 3 EquilibriumEquilibriumMultiple Choice QuestionsMultiple Choice Questions

1.1. A catalyst is added to a reaction at A catalyst is added to a reaction at equilibrium. Which of the following equilibrium. Which of the following does does notnot apply? apply?

A.A. the rate of the forward reaction increasesthe rate of the forward reaction increasesB.B. the rate of the reverse reaction increasesthe rate of the reverse reaction increasesC.C. the position of equilibrium remains unchangedthe position of equilibrium remains unchangedD.D. the position of equilibrium shifts to the rightthe position of equilibrium shifts to the right

Answer D.

2.2. ICl(l) + ClICl(l) + Cl22(g)(g) IClICl33(s) (s) H= -106 kJmolH= -106 kJmol-1-1

Which line in the table identifies correctly the changes Which line in the table identifies correctly the changes that will cause the greatest increase in the proportion that will cause the greatest increase in the proportion of solid in the above equilibrium?of solid in the above equilibrium?

TemperatureTemperature PressurePressureA.A. DecreaseDecrease DecreaseDecreaseB.B. DecreaseDecrease IncreaseIncreaseC.C. IncreaseIncrease DecreaseDecreaseD.D. IncreaseIncrease IncreaseIncrease

Answer B.


3.3. Which of the following is likely to apply to the Which of the following is likely to apply to the use of a catalyst in a chemical reaction?use of a catalyst in a chemical reaction?

position of position of H valueH valueequilibriumequilibrium

A.A. moves to rightmoves to right decreasesdecreasesB.B. unaffectedunaffected increasesincreasesC.C. mmoves to leftoves to left unaffectedunaffectedD.D. unaffectedunaffected unaffectedunaffected

Answer D.


4.4. ClCl22(g) + H(g) + H22O(l) O(l) Cl Cl –– (aq) + ClO (aq) + ClO --(aq) + 2H(aq) + 2H++(aq) (aq)

The addition of which substance would move The addition of which substance would move the above equilibrium to the right?the above equilibrium to the right?

A.A. hydrogenhydrogen

B.B. hydrogen chloridehydrogen chloride

C.C. sodium chloridesodium chloride

D.D. sodium hydroxidesodium hydroxide

Answer D.


5. 5. Chemical reactions are in a state of dynamic Chemical reactions are in a state of dynamic equilibrium only whenequilibrium only when

A.A. the rate of the forward reaction the rate of the forward reaction equals that of the backward reactionequals that of the backward reaction

B.B. the concentrations of reactants and the concentrations of reactants and products are equalproducts are equal

C.C. the activation energies of the forward the activation energies of the forward and backward reactions are equaland backward reactions are equal

D.D. the reaction involves zero enthalpy changethe reaction involves zero enthalpy change

Answer A.


6. In which of the following systems will the 6. In which of the following systems will the equilibrium position be unaffected by a equilibrium position be unaffected by a change in pressure?change in pressure?

A.A. 2NO2NO22(g) (g) N N22OO44 (g) (g)

B.B. HH22(g) + I(g) + I22(g) (g) 2HI (g) 2HI (g)

C.C. NN22(g) + 3H(g) + 3H22(g) (g) 2NH 2NH33(g)(g)

D.D. 2NO(g) + O2NO(g) + O22(g) (g) 2NO 2NO22(g) (g)

Answer B.


7. 7. In a reversible reaction, equilibrium is reached In a reversible reaction, equilibrium is reached whenwhen

A.A. molecules of reactants cease to change into molecules of reactants cease to change into molecules of productsmolecules of products

B.B. the concentration of reactants and products the concentration of reactants and products are equalare equal

C.C. the concentration of reactants and products the concentration of reactants and products are constantare constant

D.D. the activation energies of the forward and the activation energies of the forward and reverse reactions are equal reverse reactions are equal

Answer C.


8. 8. AgAg++(aq) + Fe(aq) + Fe2+2+(aq) (aq) Ag(s) + Fe Ag(s) + Fe3+3+(aq)(aq) The addition of which compound would lead to The addition of which compound would lead to

an increase in the mass of silver deposited?an increase in the mass of silver deposited?

A.A. Hydrochloric acidHydrochloric acid

B.B. Iron(II) sulphateIron(II) sulphate

C.C. Iron(III) hydroxideIron(III) hydroxide

D.D. Sulphuric acid Sulphuric acid

Answer B.


99. Some solid ammonium chloride is added to a . Some solid ammonium chloride is added to a dilutedilute

solution of ammonia.solution of ammonia. Which of the following ions will decrease in Which of the following ions will decrease in

concentration as a result?concentration as a result?

A.A. ChlorideChloride

B.B. AmmoniumAmmonium

C.C. HydrogenHydrogen

D.D. Hydroxide Hydroxide Answer D.


10. 10. NN22OO44(g) (g) 2NO 2NO22 (g) (g) H = +57kJ molH = +57kJ mol-1-1

Which of the following will increase the Which of the following will increase the concentration of nitrogen dioxide? concentration of nitrogen dioxide?

A.A. Use of a catalystUse of a catalyst

B.B. Increase in pressureIncrease in pressure

C.C. Increase in temperatureIncrease in temperature

D.D. Decrease in temperature Decrease in temperature

Answer C.


Higher Chemistry Unit 3 Section 3 Equilibrium Multiple Choice Questions This is designed to be used...

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