Rate of reaction

14 important questions on Rate of reaction

What is collision theory?

Reactant particles collide with enough energy to react( more than activation energy) for successful collision

How does surface area affect the rate of reaction?

Reactions go faster when SA is increased because a bigger area is exposed meaning there is a greater chance of successful collisions.

How does temperature affect the rate of reaction?

Reaction rate increases with heat and particles go faster so there are more collisions.
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How does concentration affect the rate of reaction?

The higher the concentration, the more reacting particles in a given volume, and a greater chance of them bumping into eachother

How does pressure affect the rate of reaction?

Reaction rate increases with pressure because reacting particles are closer together meaning there is more chance of successful collision

What are the two ways of measuring reaction rates?

1) Measure the rate at which a reactant is used up
2) Measure the rate at which a product is formed

What is the rate of reaction formula?

amount of reactant used or product formed
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time taken

What is a catalyst?

A substance that speeds up a reaction without chemically changing itself or the reactants.

What affect do catalysts have on activation energy?

A catalyst provides an alternate route for the reaction which requires less activation energy which also increases the rate of the reaction

The two rules for reversible reactions ?

1) one reaction is exothermic while the other is endothermic
2) In any reversible reaction, the amount of energy transferred to the surroundings in one direction is exactly the same as the amount of energy transferred back in when the reaction goes the other way.

What is an example of a reversible reaction?

hydrates copper sulphate (CuSO4.5H2O) ---> anhydrous copper sulphate(CuSO4)+ water(5H2O) 
endothermic in forward reaction and exothermic in reverse reaction

How does changing the temperature affect equilibrium?

Increasing the temperature always favours endothermic reaction and decreasing favours exothermic

How does pressure (only for gases) affect the equilibrium?

High pressure favours the side with the lowest volume, whereas low pressure always favours the side with highest volume of gases. Changing pressure will not affect the position of equilibrium.

How does adding a catalyst affect the equilibrium?

A catalyst reduces the time taken to reach the equilibrium but does not change the position of the equilibrium

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