Paper 2 - The Rate And Extent Of Chemical Change

Question 1

What is the rate of reaction?

Answer 1

Rate of reaction how fast it takes for the reactants to become products

Question 2

What do steep lines on a chemical reaction graph mean?

Answer 2

Steeper the lines on a chemical reaction graph, the faster the reaction is

Question 3

Why do steep lines of a chemical reaction graph become less steep overtime?

Answer 3

Steep lines on a chemical reaction graph becomes less steep as the reactants get used up

Question 4

What do flat lines mean on a chemical reaction graph?

Answer 4

Flat lines on a chemical reaction graph show that the reaction has finished

Question 5

What is the collision theory?

Answer 5

The collision theory is that the rate of reaction depends on:
The collision frequency of the particles - more collisions = faster reaction
The energy transferred during a collision

Question 6

What is activation energy?

Answer 6

Activation energy is the minimum amount of energy required for the particles to react

Question 7

What are the factors which affect the rate of reaction?

Answer 7

Factors that affect the rate of reaction:
temperature
the concentration of a solution
pressure of gas
surface area
the presence of a catalyst

Question 8

Why does increasing concentration increase rate of reaction?

Answer 8

Increasing concentration means that more particles are colliding in the same volume of water

Question 9

Why does increasing pressure of a gas speed up the rate of reaction?

Answer 9

Increasing pressure in a gas means that the same number of particles occupy a smaller space, meaning more will collide

Question 10

How do catalysts increase rate of reaction?

Answer 10

Catalysts increases rate of reaction by providing an alternate reaction pathway with a lower activation energy, therefore speeding up the rate of reaction