Factors Affecting the Rate of Reaction

Question 1

what are the four things rate of reaction depends on?

Answer 1

1. temperature
2. the concentration of a solution or the pressure of gas
3. surface area
4. the presence of a catalyst

Question 2

how does higher temperature increase rate?

Answer 2

• higher temperature increases rate because the particles have more kinetic energy
• so the percentage of collisions with enough energy is higher
• so there are more successful collisions per unit time

Question 3

how does higher concentration/gas pressure increase rate?

Answer 3

• higher solution concentration/gas pressure increases rate because there are more particles per unit volume
• so the collision frequency is higher
• so there are more successful collisions per unit time

Question 4

how does higher solid surface area increase rate?

Answer 4

• higher solid surface area increases rate because more of the solid is exposed to the other particles
• so the collision frequency is higher
• so there are more successful collisions per unit time