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10 Cards in this Set
- Front
- Back
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How does increasing the surface area of a solid affect the rate of reaction? |
The reaction on a solid occurs on the surface Increasing surface area provides more area on the surface for the reaction to occur |
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How does increasing the concentration of the reactant increase the rate of reaction? |
• There are more reactant particles in the same volume. • Greater frequency of collisions between different reactant particles •Greater frequency of successful collisions •Increase in rate |
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How does increasing the temperature increase the rate of reaction? |
•Particles have a greater store of kinetic energy (move faster) •They collide with more energy •Greater frequency of collisions •Increase of number of successful collisions (as they collide with more energy more frequently) •Increase in rate |
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Define a catalyst |
A catalyst increases the rate of a reaction without being used up itself; it provides an alternative route for the reaction to take, with a lower activation energy |
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Define equilibrium |
Equilibrium is where the rate of the forward reaction is equal to the rate of the backward reaction. |
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What is Le Chatelier's Principle? |
If equilibrium is disturbed by a change in conditions, the position of equilibrium moves to counteract or oppose the change |
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Positive delta H shows the reaction is endo/exo thermic |
Endothermic |
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Negative delta H shows the reaction is endo/exo thermic |
Exothermic |
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How does an increase in pressure affect the rate of the reaction |
• There are more reactant particles for everu unit of volume. • Greater frequency of collisions between different reactant particles •Greater frequency of successful collisions •Increase in rate |
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Why does the rate of reaction decrease as the reaction progresses |
Reactant particles used up Decrease in concentration Less frequent collisions (Less frequent successful collisions) Rate decreases |
