KO homework

Question 1

Rate of reaction

Answer 1

mass/volume of product formed or reactant used up per unit time

Question 2

The rate of reaction depends on (particle model)

Answer 2

1. Frequency of collisions between reacting particles
2. Energy transferred during collisions
3. Activation energy - the minimum energy that particles must have to successfully collide and form bonds

Question 3

Mean rate of reaction

Answer 3

Quantity of reactant used/time taken

or

Quantity of product formed/time taken

Question 4

Factors affecting the rate of reaction

Answer 4

1. Concentrations of reactants in solution
2. Pressure of reacting gases
3. Surface area of solid reactants
4. Temperature of the reactants
5. Presence of catalysts

Question 5

Catalysts

Answer 5

Increase the rate of a reaction by providing an alternative (easier) pathway for the reaction that has a lower activation energy.

Question 6

Activation energy

Answer 6

The minimum amount of energy needed to start a reaction

Question 7

Dynamic equilibrium

Answer 7

When the forward and backwards reactions of a reversible reaction are occurring at the same time.

Question 8

Method 1

Answer 8

Measure the volume of gas produced.

e.g. magnesium metal and dilute hydrochloric acid produces hydrogen gas.

Question 9

Method 2

Answer 9

Timing the formation of product.

e.g. sodium thiosulfate and hydrochloric acid makes a cloudy yellow solution.

Question 10

Method 3

Answer 10

Measure the change in mass.

e.g. calcium carbonate in dilute acid will release CO₂ into the air.