GCSE Chemistry: Rate of reaction — concentration (video)

Collision theory and the effect of concentration on the rate of reaction — from freesciencelessons. Each card deep-links to the video.

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What two conditions must be met for a chemical reaction to occur according to collision theory?
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Reacting particles must collide with each other, and the collisions must have sufficient energy.
The rate of a chemical reaction is determined by the ?.
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frequency of successful collisions
Why are chemical reactions rapid initially?
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Because there is a large number of reactant molecules, leading to a large number of collisions per second.
Why do chemical reactions slow down over time?
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Because the number of reactant molecules decreases, resulting in fewer collisions per second.
Why does a chemical reaction eventually stop?
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Because all reactant molecules have been used up, so the number of collisions per second becomes zero.
How does doubling the concentration of reactants affect the rate of reaction?
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It doubles the rate of reaction because there are twice as many collisions per second.
What is the relationship between reaction rate and concentration of reactants?
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The rate is proportional to the concentration.
On a product-time graph, how can you tell which reaction had a higher concentration of reactants?
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The line is steeper, indicating a faster reaction.
Why does a higher concentration of reactants produce more product at the end of a reaction?
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Because there are more reactant molecules at the start.

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