The activation energy for a reaction was measured with and without a catalyst. Select the value below that was the value for the catalysed reaction.
Responda
72 kJ/mol
55 kJ/mol
Questão 8
Questão
Increasing the [blank_start]surface area[blank_end] of reactants frees up more particles that are available to [blank_start]collide[blank_end] right away. This doesn't add more particles in to the reaction, it only allows particles that would have once had to wait for other particles to react first to be available. This leads to more [blank_start]frequent[blank_end], successful collisions and so the rate of reaction [blank_start]increases[blank_end].
Responda
surface area
collide
frequent
increases
Questão 9
Questão
There are three main ways to measure the rate of a reaction:
Responda
the change of mass of reactants over time
the volume of gas produced over time
the time taken for a solution to change colour, or form a precipitate
the change in volume of reactants over time
the mass of gas produced over time
the time taken for a solution to form
Questão 10
Questão
Equilibrium is reached when the forward and reverse reactions occur at similar rates.
Responda
True
False
Questão 11
Questão
The concentrations of the reactants vs products are not necessarily equal at equilibrium, and there is usually more of one than the other.
If the concentration of the reactants is higher than products, we say the equilibrium lies to the [blank_start]left[blank_end].
If the concentration of the products is higher than the reactants, we say the equilibrium lies to the [blank_start]right[blank_end].
Responda
left
middle
right
right
middle
left
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Semelhante
GCSE - AQA: C1.1 The Fundamental Ideas in Chemistry