Equilibria (triple) quiz

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

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 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) increase rate of reaction

Question 1 of 15

2. What type of substance speeds up a chemical reaction but is chemically unchanged at the end of the reaction?

Catalyst

Solute

Reagent

Ore

Question 2 of 15

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

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 catalyst reduces the activation energy, and is not used up

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 3 of 15

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

Cream

White

Purple

Blue

Question 4 of 15

5. 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?

0.56 %

0.857 %

56 %

85.7 %

Question 5 of 15

6. Write a chemical equation for the reaction between hydrogen chloride and ammonia

NH₃ + HCl ⇌ NH₄Cl

NH₃ + HCl ⇌ NH₄Cl + H₂O

2NH₄ + 2HCl ⇌ 2NH₄Cl + H₂

2NH₃ + 2HCl ⇌ 2NH₃Cl + H₂

Question 6 of 15

7. What will happen to the equilibrium position when the pressure is increased? Give a reason for your prediction. CH₄(g) + H₂O(g) ⇋ CO(g) + 3H₂(g) ΔH = +210 kJ mol⁻1

Equilibrium will move to the left because there are more molecules on the left hand side

Equilibrium will move to the left because there are fewer molecules on the left hand side

Equilibrium will move to the right because there are fewer molecules on the right hand side

Equilibrium will move to the right because there are more molecules on the right hand side

Question 7 of 15

8. What does this symbol represent?

Dynamic equilibrium

Yield of reaction is the same both ways

Rate of forward reaction equals rate of backwards reaction

Reversible reaction

Question 8 of 15

9. What is meant by the term activation energy?

The energy released by the reaction

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

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

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

Question 9 of 15

10. One feature of dynamic equilibrium is that there is no overall change in concentrations. What is the other?

The yield of the backward reaction is greater than 50%

The yield of the forwards reaction is greater than 50%

The rate of the forward reaction is equal to the rate of the backward reaction

The rate of the forward reaction is greater than the rate of the backward reaction

Question 10 of 15

11. What is meant by the term endothermic?

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

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

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

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

Question 11 of 15

12. 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 12 of 15

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

Constant equilibrium

Static equilibrium

Variable equilibrium

Dynamic equilibrium

Question 13 of 15

14. Explain why experimental values of enthalpy change differ from theoretical values

Different equipment produces different results. Not all the reactants are used up

Different equipment produces different results. Heat energy is lost to the surroundings. Not all the reactants are used up

Heat energy is lost to the surroundings. Not all the reactants are used up.

Different equipment produces different results. Heat energy is lost to the surroundings

Question 14 of 15

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

Decomposition

Condensation

Combustion

Diffusion

Question 15 of 15

Equilibria (triple) quiz

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