GCSE 2.3 Rate of Reaction

Which of the following equations represents the rate of a reaction?

• Rate = 1/time

• Rate = time/1

• Rate = mass/volume

• Rate = volume/mass

Which of the following methods is NOT suggested for measuring the rate of a reaction?

• Measuring a change in mass

• Measuring gas volume

• Measuring temperature change

• Formation of a precipitate against time

What is the effect of increasing temperature on the rate of reaction?

• Decreases the rate of reaction

• Increases the rate of reaction

• Has no effect on the rate of reaction

• Stops the reaction

What is a catalyst?

• A substance that decreases the rate of a reaction

• A substance that increases the rate of a reaction without being used up

• A substance that is consumed in the reaction

• A substance that changes the color of the reactants

Which of the following is NOT a factor affecting the rate of reaction?

• Temperature

• Concentration

• Colour of the reactants

• Frequency and energy of collisions between particles

What is the role of a catalyst in a chemical reaction?

• It provides an alternative reaction pathway of higher activation energy

• It provides an alternative reaction pathway of lower activation energy

• It increases the concentration of reactants

• It decreases the temperature of the reaction

What is the rate of reaction?

• The speed at which particles move

• The speed at which a reaction happens

• The amount of energy in a reaction

• The number of particles in a reaction

According to collision theory, what must happen for a reaction to take place?

• Particles must have low energy

• Particles must collide with enough energy

• Particles must move slowly

• Particles must be large

How does increasing the temperature affect the rate of reaction?

• It decreases the energy of particles

• It slows down the movement of particles

• It increases the number of successful collisions

• It decreases the number of particles

What happens when the concentration of reactants is increased in a reaction vessel?

• The number of successful collisions decreases

• The number of reactant particles decreases

• The number of successful collisions increases

• The volume of the reaction vessel increases