IGCSE chemistry- rates of reaction

For a reaction to occur particles must _______ with enough energy to break existing bonds

How do you increase the rate of reaction? (Select multiple)

• increase the concentration of the reactant

• decrease the temperature

• increase the surface area of the reactants

• decrease the surface area of the reactants

• add a catalyst

What is the role of the catalyst?

• To increase the rate of reaction

• To decrease the rate of reaction

• To replace the reactant

• To make a new chemical reaction occur

As temperature increases the ____ energy of the particles increase, increasing the frequency of successful collisions

Label number 2

• bond making

• reactants

• activation energy

• overall energy released

How does a catalyst increase the rate of reaction?

• It provides an alternative pathway for the reaction with a lower activation energy

• It lowers the activation energy of the reaction

• It gives the particles more kinetic energy causing them to collide with more frequency

• It increases the activation energy of the reaction

Which concentration of acid had the fastest rate of reaction?

• 0.5 mol dm3

• 1.0 mol dm3

• 2.0 mol dm3