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WorksheetsReaction Rate
Total questions: 9
Worksheet time: 5mins
The reaction pathway diagram below illustrates the energies of reactants, products and the transition state of a reaction.
Which expression represents the activation energy of the forward reaction?
E1 – E2
E1 – E3
E2 – E3
(E1 – E2) – (E2 – E3)
The reaction represented by the following equation was carried out.
HCO2CH3(aq) + NaOH(aq) → HCO2Na(aq) + CH3OH(aq)
Which graph best shows the relationship between [CH3OH(aq)] and t, the time from mixing of the reactants?
Na2S2O3 reacts with dilute HCl to give a pale yellow precipitate. If 1 cm3 of 0.1 mol dm–3 HCl is added to 10 cm3 of 0.02 mol dm–3 Na2S2O3 the precipitate forms slowly.
If the experiment is repeated with 1 cm3 of 0.1 mol dm–3 HCl and 10 cm3 of 0.05 mol dm–3 Na2S2O3 the precipitate forms more quickly.
Why is this?
The activation energy of the reaction is lower when 0.05 mol dm–3 Na2S2O3 is used.
The collisions between reactant particles are more violent when 0.05 mol dm–3 Na2S2O3 is used.
The reaction proceeds by a different pathway when 0.05 mol dm–3 Na2S2O3 is used.
The reactant particles collide more frequently when 0.05 mol dm–3 Na2S2O3 is used.
In the diagram, curve X was obtained by observing the decomposition of 100 cm3 of 1.0 mol dm–3 hydrogen peroxide, catalysed by manganese(IV) oxide.
adding water
adding some 0.2 mol dm–3 hydrogen peroxide
using less manganese(IV) oxide
lowering the temperature
The Boltzmann distribution shows the number of molecules having a particular kinetic energy at constant temperature. If the temperature is decreased by 10 °C, what happens to the size of the areas labelled L, M and N?
L decreases, M decreases, N decreases
L decreases, M increases, N decreases
L increases, M decreases, N decreases
L increases, M decreases, N increases
Which factors affect the rate of a reaction?
slow down
move faster
stay apart from each other
move in the correct order
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 reactant particles
it increases the frequency of collision
Why does a higher temperature increase the rate of a reaction?
It increases both the frequency collision and energy of reactant particles
It only increases the frequency of collision
It only increases the energy of reactant particles
It reduces the activation energy of the reaction
As the frequency of ________________ collision increases, the rate of reaction increases.
time
speed
effective
efficient
