Rates Of Reaction Paper 2

Question 1

What affects the rate of a reaction

Answer 1

Temperature
Catalyst
Concentration/ pressure
Surface area

Question 2

How does the use of catalyst affect the rate of a reaction

Answer 2

Speeds up the rate of the reaction by reducing the activation energy and finding an alternate reaction pathway

Question 3

How does temperature affect the rate of the reaction

Answer 3

It increases the rate of the reaction as particles gain more kinetic energy so they more faster resulting in more successful collisions

Question 4

How does pressure/concentration increase the rate of the reaction

Answer 4

There are more reactant particles per unit volume, so a greater chance of particles colliding and therefore more successful collisions

Question 5

How does pressure/concentration increase the rate of the reaction

Answer 5

There are more reactant particles per unit volume, so a greater chance of particles colliding and therefore more successful collisions

Question 6

How does surface area affect the rate of the reaction

Answer 6

Higher surface area Increases the rate of reaction as more particles are exposed to the other reactant so there is a greater chance of particles colliding and so more successful collisions

Question 7

What is required for a chemical reaction to happen

Answer 7

Reactant particles must collide with each-other and particles must have enough energy for them to react

Question 8

What is the rate of a reaction

Answer 8

It’s the measure of how fast it takes for reactants to be used up and products to form

Question 9

What is activation energy

Answer 9

The minimum amount of energy required for a reaction to take place

Question 10

How do you calculate the mean rate of a reaction

Answer 10

Quantity of reactant used ➗ time taken

Question 11

How can you tell a reaction is a reversible reaction

Answer 11

Double arrow

Question 12

Rates of reaction practical?

Answer 12

Using a measuring cylinder, add 50 cm³ of hydrogen peroxide solution to a conical flask. Loosely connect the bung into the conical flask and make sure the delivery tube connects to the gas syringe.
Measure 0.5 g of a catalyst.
Add 0.5g of a catalyst to the flask, put the bung back into the flask and start the stopwatch.
Record the volume of gas given off every 10 seconds. Continue timing until no more oxygen appears to be given off or the gas cylinder is full
Repeat steps 1 to 7 for another two catalysts

Question 13

What happens once dynamic equilibrium is reached?

Answer 13

Forward and backward reactions are occurring simultaneously
Concentration of P & R stay consistent

Question 14

What if the factor affecting position of equilibrium is altered?

Answer 14

Position of equilibrium will shift to oppose effect of change