Equilibria (triple) quiz

1. What does this diagram represent?

Energy level diagram for an exothermic reaction

Reaction profile for an exothermic reaction

Energy level diagram for an endothermic reaction

Reaction profile for an endothermic reaction

Question 1 of 15

2. What does this symbol represent?

Reversible reaction

Dynamic equilibrium

Yield of reaction is the same both ways

Rate of forward reaction equals rate of backwards reaction

Question 2 of 15

3. In a calorimetry experiment to investigate the heat energy released by the combustion of ethanol, why should the water in the calorimeter be stirred?

To ensure the container does not get too hot

To prevent the water from evaporating

To allow the heat to spread evenly through the copper container

To ensure the heat energy is mixed evenly throughout all the water

Question 3 of 15

4. What colour is anhydrous copper (II) sulfate?

Cream

White

Blue

Purple

Question 4 of 15

5. In a sealed container, a reversible reaction can reach a state of ______________________________

Constant equilibrium

Variable equilibrium

Static equilibrium

Dynamic equilibrium

Question 5 of 15

6. What is meant by the term activation energy?

The minimum energy that the particles in collision must have if a reaction is going to occur

The energy released by the reaction

The energy provided by the catalyst to allow a reaction to proceed

The maximum energy of the final product for it to be stable

Question 6 of 15

7. In the thermal decomposition of calcium carbonate, we might expect 50g of calcium carbonate to produce 28g of calcium oxide. If instead only 24g of calcium oxide is produced, what is the percentage yield?

85.7 %

56 %

0.857 %

0.56 %

Question 7 of 15

8. Why a catalyst does not affect the position of equilibrium in a reversible reaction?

A catalyst reduces the activation energy, and is not used up

If a reversible reaction is in dynamic equilibrium, a catalyst increases the rate of the forward reaction and the rate of the backward reaction by the same amount, so the position of equilibrium is unaffected

A reaction in dynamic equilibrium already has the lowest possible activation energy

A catalyst has no effect on a forward or backward reactions if it is in dynamic equilibrium

Question 8 of 15

9. One feature of dynamic equilibrium is that the rate of the forward reaction is equal to the rate of the backward reaction. What is the other feature?

There is no overall change in concentrations

The concentration of the products is increasing

The yield of the backward reaction is greater than 50%

The yield of the forwards reaction is greater than 50%

Question 9 of 15

10. What name is given to the movement of gases?

Diffusion

Decomposition

Condensation

Combustion

Question 10 of 15

11. What will happen to the equilibrium position when we add a catalyst? Give a reason for your prediction. A (g) + B (g) ⇋ C (g) (-∆H)

Equilibrium will move to the right, because a catalyst increases the backward rate of reaction

Equilibrium will move to the left, because a catalyst increases the forward rate of reaction

Equilibrium will move to the right, because a catalyst increases the forward rate of reaction

Equilibrium will not shift in position, because catalyst does not affect the position of equilibrium

Question 11 of 15

12. Explain the effects of increasing the temperature on the rate of a reaction in terms of particle collision theory

1) particles have more kinetic energy 2) more frequent collisions 3) and a higher proportion of the collisions which occur have greater or equal to the activation energy 4) increase rate of reaction

1) particles have less kinetic energy 2) less frequent collisions 3) and a lower proportion of the collisions which occur have greater or equal to the activitation energy 4) decrease rate of reaction

1) particles have more kinetic energy 2) more frequent collisions 3) and a lower proportion of the collisions which occur have greater or equal to the activitation energy 4) increase rate of reaction

1) particles have less kinetic energy 2) less frequent collisions 3) and a lower proportion of the collisions which occur have greater or equal to the activitation energy 4) increase rate of reaction

Question 12 of 15

13. Ammonia and hydrogen chloride react together in a reversible reaction to produce a white solid. What are the word and symbol equations?

ammonia + hydrogen chloride ⇌ ammonium chloride + water NH₃ + HCl ⇌ NH₄Cl + H₂O

ammonia + hydrogen chloride ⇌ ammonium chloride + hydrogen 2NH₃ + 2HCl ⇌ 2NH₃Cl + H₂

ammonia + hydrogen chloride ⇌ ammonium hydrochloride NH₃ + HCl ⇌ NH₃ClH

ammonia + hydrogen chloride ⇌ ammonium chloride NH₃ + HCl ⇌ NH₄Cl

Question 13 of 15

14. What is a catalyst?

A substance that helps dissolve insoluble reagents to speed up the rate of reaction

A substance that speeds up a chemical reaction but is used up as the reaction proceeds

A substance that slows down a chemical reaction but is chemically unchanged at the end of the reaction

A substance that speeds up a chemical reaction but is chemically unchanged at the end of the reaction

Question 14 of 15

15. What is meant by the term exothermic?

A reaction which will only be spontaneous at cold temperatures (below 0⁰C)

A reaction which will only be spontaneous at warm temperatures (above 100⁰C)

A reaction in which heat energy is taken in (surroundings get colder)

A reaction in which heat energy is given out (surroundings get hotter)

Question 15 of 15

Equilibria (triple) quiz

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