Equilibria (triple) quiz

1. What does this symbol represent?

Reversible reaction

Rate of forward reaction equals rate of backwards reaction

Yield of reaction is the same both ways

Dynamic equilibrium

Question 1 of 15

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

Decomposition

Condensation

Diffusion

Combustion

Question 2 of 15

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

NH₃ + HCl ⇌ NH₄Cl

2NH₄ + 2HCl ⇌ 2NH₄Cl + H₂

2NH₃ + 2HCl ⇌ 2NH₃Cl + H₂

NH₃ + HCl ⇌ NH₄Cl + H₂O

Question 3 of 15

4. With how much energy must two particles collide for a reaction to occur?

The particles must collide with an energy greater than or equal to the activation energy

The particles must collide with an energy greater than the activation energy

The particles must collide with an energy less than the activation energy

The particles must collide with an energy equal to the activation energy

Question 4 of 15

5. Explain the effects of increasing the concentration of solutions on the rate of a reaction in terms of particle collision theory

1) more particles in same space 2) less frequent collisions 3) increase rate of reaction

1) more particles in same space 2) less frequent collisions 3) decrease rate of reaction

1) more particles in same space 2) more frequent collisions 3) decrease rate of reaction

1) more particles in same space 2) more frequent collisions 3) increase rate of reaction

Question 5 of 15

6. 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 6 of 15

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

Purple

Blue

Cream

White

Question 7 of 15

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

Constant equilibrium

Variable equilibrium

Static equilibrium

Dynamic equilibrium

Question 8 of 15

9. What is a catalyst?

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

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

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

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

Question 9 of 15

10. What is meant by the term endothermic?

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

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

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

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

Question 10 of 15

11. State the expression for calculating % yield.

% yield = (actual amount of products/theoretical amount of products) x 100

% yield = (theroretical amount of products/actual amount of products)

% yield = (theroretical amount of products/actual amount of products) x 100

% yield = (actual amount of products/theoretical amount of products)

Question 11 of 15

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

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

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

Question 12 of 15

13. What will happen to the rate of reaction when we decrease temperature? A (g) + B (g) ⇋ C (g) + D (g) (+∆H)

it depends on the conditions

increase

remain constant

decrease

Question 13 of 15

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

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

The yield of the backward reaction is greater than 50%

The yield of the forwards reaction is greater than 50%

Question 14 of 15

15. What does the symbol ΔH mean

specific heat capacity

enthalpy (energy) change

exothermic

heat energy

Question 15 of 15

Equilibria (triple) quiz

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