Rates Of Reaction

Question 1

Define rate of reaction

Answer 1

The speed at which a chemical reaction takes place

Question 2

Name the units for measuring rate of reaction

Answer 2

Cm3/s if measuring volume of gas, g/s if measuring changing mass

Question 3

List some factors that can change the rate of a chemical reaction

Answer 3

Concentration, catalyst, temperature, surfacd area of reactants

Question 4

Explain how a catalyst speeds up a chemical reaction

Answer 4

A catalyst speeds up a reaction by lowering the energy needed for the reaction to happen. It helps reactants react more easily without being used up in the process.

Question 5

Explain how temperature can affect the rate of a chemical reaction

Answer 5

Temperature affects the rate of a chemical reaction by increasing the kinetic energy of particles, leading to more frequent and energetic collisions. At higher temperatures, a greater proportion of collisions have enough energy to overcome the activation energy, resulting in a faster reaction rate.

Question 6

Explain how concentration of the particles affects the raye of a chemical reaction

Answer 6

The concentration of particles affects the rate of a chemical reaction because a higher concentration means more particles are present in a given volume. This increases the frequency of collisions between reactant particles, making it more likely for successful collisions to occur. As a result, the reaction rate increases with higher concentration.

Question 7

Explain how surface area of the particles affects the rate of chemical reaction

Answer 7

The surface area of particles affects the reaction rate by determining how much of the material is exposed for collisions. A larger surface area, achieved by breaking solids into smaller pieces, allows more frequent and effective collisions, speeding up the reaction

Question 8

What is collision theory?

Answer 8

The collision theory states that a chemical reaction can only occur between particles when they collide.