Rates Of Reactions

Question 1

What does the collision theory state?

Answer 1

In order for a reaction to occur, particles must collide with sufficient energy and have the correct orientation

Question 2

What is activation energy?

Answer 2

The minimum amount of energy required for a reaction to occur

Question 3

What are the factors that affect the rate of reaction?

Answer 3

Temperature, concentration, surface area and catalysts

Question 4

How do you draw the graph in experiment questions?

Answer 4

Draw the line:

• Faster rate of reaction: curved line
• Slower rate of reaction: linear line
• Make sure that the curved line becomes flat before the linear line (reaction finishes earlier)
• Label the line you’ve drawn

Question 5

Explain surface area in relation to the rate of reaction

Answer 5

The smaller an object is, the larger the area of its surface is exposed, meaning it has a large surface area. The larger an object is, the smaller the area of its surface is exposed, meaning it has a small surface area. Smaller objects have faster rates of reaction than larger objects due to the larger surface area.

Question 6

What order must you always answer rate of reaction questions in?

Answer 6

The factor → particles → collisions → rate of reaction

Question 7

What does it mean if there is a small or large concentration?

Answer 7

Dilute/small concentrations mean there are less reactant particles per unit volume

Concentrated/large concentrations mean there are more reactant particles per unit volume