Year 10 Core Chemistry 2 Revision

The rate of a chemical reaction is NOT affected by which of the following:

• temperature

• concentration

• particle size (surface area)

• All of these affect reaction rates

The rate of a reaction increases as temperature__________________.

• Decreases

• Increases

• Stays the Same

Products will form faster if____________

• the particle size of the reactants are larger.

• temperature is decreased.

• concentration of the reactants are increased.

• the reaction is not stirred.

A ______________ is a substance that increases the rate of a reaction without being used up during the reaction.

• catalyst

• product

• reactant

• solute

A 10 g sample of marble chips is compared to 10 g sample of crushed and powdered marble. The surface area..

• of the marble chips is greater than the powder.

• of the marble chips is smaller than the powder.

• of the marble chips is the same as the powder.

Usually lowering the temperature will slow down a reaction.

• false

• true

• maybe

Increasing the temperature will increase the kinetic energy of particles, therefore the number of collisions between particles will:

• decrease

• increase

• stay the same

• not this one

What type of reaction is this?

• Endothermic

• Exothermic

• Thermomix

• Not this one

Why does a higher concentration increase the rate of reaction?

• it increases the amount of reactants

• it lowers the activation energy

• it increases the energy of particle collisions

• it increases the frequency of particle collisions because there are more collision sites

Products will form faster if____________

• the particle size of the reactants are larger.

• temperature is decreased.

• concentration of the reactants are increased.

• the reaction is not stirred.