AQA Chemistry (9-1) Rates

What is the rate of a chemical reaction? Choose 2.

• How quickly the reactants in a reaction are used up
• How quickly the reactants in a reaction are made
• How quickly the products in a reaction are used
• How quickly the products in a reaction are formed

How do we calculate mean rate of reaction?

• quantity of product made/time taken
• time taken/quantity of product made

What are the two possible units for rate of reaction? Choose 2

• s/g

• g/m

• cm³/s

• g/s

• m/s

On a rates graph, what type of line shows the reaction has ended?

• Sloped
• Curved
• Straight
• Vertical
• Horizontal

What is "collision theory"?

• Reactions only occur when particles collide with sufficient energy
• Collisions occur when particles collide with no energy
• Collisions mean that particles hit each other gently

What factors can affect the rate of a reaction? Choose 4

• Temperature
• Surface area of a solid
• Concentration in solution, pressure of gases
• Bigger beaker
• Pressure of gases

State the effect of increasing the surface area on the rate of a reaction

• Increases
• Decreases
• Stays the same

Why does increasing surface area increase the rate of a reaction?

• Less particles available to collide, so more frequent effective collisions.
• More particles available to collide, so more frequent effective collisions.
• Less particles available to collide, so less frequent effective collisions.
• More particles available to collide, so less frequent effective collisions.

Increasing the concentration …........................ the rate of reaction

• Increases
• Decreases
• Stays the same

Why does increasing concentration increase the rate of reaction?

• More particles in more space, so more frequent effective collisions.
• More particles in same space, so less frequent effective collisions.
• More particles in same space, so more frequent effective collisions.