Speed of Reaction

Question 1

Collision theory

Answer 1

Collision theory states that for a chemical reaction to occur between reactants, reacting particles must collide and particles need to collide with a minimum amount of energy

Question 2

Activation energy

Answer 2

The minimum amount of energy that reactant particles must possess in order for a chemical reaction to occur

Question 3

Ineffective collision

Answer 3

Below Ea —> No new products formed

Question 4

Effective collision

Answer 4

Achieve Ea —> new products formed

Question 5

Speed of reaction

Answer 5

Speed of reaction depends on the frequency of effective collisions between reactant particles, or the number of effective collisions per unit time

Question 6

Factors affecting speed of reaction

Answer 6

1. Temperature
2. Concentration of reactants
3. Pressure (gas reactants)
4. Surface area

Question 7

Temperature

Answer 7

Temperature increase, SOR increase

In general, SOR doubles for every 10 degrees celcius increase in temperature

At low temperatures, the reactant particles move slowly because they have little energy. When temperature increases, particles gain kinetic energy and move faster. More reactant particles will collide with energy greater than activation energy. Together, the frequency of effective collisions increases, therefore speed of reaction increases