The Rate And Extent Of Chemical Change

Question 1

Give three common ways of measuring rate of reaction:

Answer 1

Loss in mass of reactants
Volume of gas produced
Time for a solution to become opaque

Question 2

Give five factors affecting the rate of a chemical reaction:

Answer 2

Concentration of reactants
Pressure of gases
Surface area
Temperature
Catalysts

Question 3

What is the collision theory?

Answer 3

Chemical reactions can occur only one reacting particles collide with each other with sufficient energy

Question 4

What is a catalyst? How does it work?

Answer 4

A catalyst changes the rate of reaction but it is not used up
Increases the rate of reaction

Question 5

What is an enzyme?

Answer 5

A molecule that acts as a catalyst in a biological system

Question 6

What is a reversible reaction?

Answer 6

Where the products of a reaction can react backwards to produce the original reactants

Question 7

Describe the effect of changing the concentration of reactant and product on the position of the equilibrium:

Answer 7

If the concentration of one of the reactants or products changed the system is no longer at equilibrium and the concentrations of all the substances will change until equilibrium is reached again

Question 8

Describe the effect of a catalyst on the position of the equilibrium:

Answer 8

No effect
It just speeds up both forward and backward reactions equally