Speed of reaction

Question 1

How can we tell the change in speed of reaction from a graph?

Answer 1

the larger the gradient, the higher the speed of reaction

Question 2

What are the factors that affect the speed of reaction?

Answer 2

concentration
pressure
particle size / surface area
temperature
presence of catalyst

Question 3

How does the concentration affect the speed of reaction?

Answer 3

the greater the concentration of reactant, the greater the speed of reaction

Question 4

How does the pressure affect the speed of reaction?

Answer 4

the greater the pressure, the greater the speed of reaction

Question 5

How does the surface area affect the speed of reaction?

Answer 5

the greater the surface area, the greater the speed of reaction

Question 6

How does temperature affect the speed of reaction?

Answer 6

the greater the temperature, the greater the speed of reaction

Question 7

What is a catalyst?

Answer 7

substance which increases the speed of a chemical reaction and remains chemically unchanged at the end of reaction

Question 8

What are the characteristics of a catalyst?

Answer 8

minute amount needed
lowers activation energy
does not change yield
remains chemically unchanged
impurities prevent catalyst from working
selective in action

Question 9

What are enzymes?

Answer 9

substance that catalyse chemical reactions

they are biological catalysts

Question 10

What are the characteristics of enzymes?

Answer 10

proteins
specific in action
sensitive to ph and temperature changes