Reaction Rates - exam practice

the average energy of the particles that react

the minimum energy required for a reaction to occur

the energy difference between the reactants and products

the energy produced by the particles that react

there is no change

the peak moves to the left and is higher

the peak moves to the right and is lower

the total area under the curve increases

E₁ - E₂

E₂ - E₁

E₂ - E₃

E₃ - E₂

adding some 0.1 mol dm^-3 hydrogen peroxide

adding water

lowering the temperature

using less manganese(IV) oxide

both reaction 1 and reaction 2 use a heterogeneous catalyst

both reaction 1 and reaction 2 use a homogeneous catalyst

reaction 1 uses a heterogeneous catalyst and reaction 2 uses a homogeneous catalyst

reaction 1 uses a homogeneous catalyst and reaction 2 uses a heterogeneous catalyst

the hydrogen ions act as a heterogeneous catalyst

the hydrogen ions are in the same phase as the reactants

the hydrogen ions are used up in the reaction

the hydrogen ions have no effect on the activation energy of the reaction

if a catalyst is added, peak P will be lower and E_a will move to the left

if a catalyst is added, peak P will be lower and E_a will move to the right

if a catalyst is added, peak P will be the same and E_a will move to the left

if a catalyst is added, peak P will be the same and E_a will move to the right

a greater proportion of collisions is successful at the higher concentration

the particles are further apart at the higher concentration

the particles have more energy at the higher concentration

there are more collisions between reactant particles per second at the higher concentration

higher and further to the right

higher and further to the left

lower and further to the right

lower and further to the left

the activation energy decreases

the activation energy increases

more molecules have an energy greater than the activation energy

the molecules collide more frequently

position A represents the mean energy of a molecule in the container

addition of a catalyst moves the position of E_a to the right

the area under the curve to the right of E_a represents the number of molecules with enough energy to react

the position of the peak of the curve at a higher temperature is further away from both axes

A

B

C

D