C3 - Rate of Reaction

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What does rate of reaction mean?
Measuring how much product is formed in a fixed period of time
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What is a reactant?
a substance that takes part in and undergoes change during a reaction
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What is a product?
A chemical substance formed as a result of a chemical reaction
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How can the rate of reaction be worked out?
The gradient
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What is a limiting reactant?
The reactant that is not used in excess that gets used up by the end of the reaction
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Reactions occur when..
particles collide together
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What happens in terms of produce if the number of reacting particles is reduced?
The number of collisions by particles of that reactant is limited
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What does the rate of the reaction depend on?
The number of collisions
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What are three ways to increase rate of reaction?
Concentration, temperature and pressure
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What does concentration mean?
The amount of particles in that same space. As the concentration increases, it means the particles become more crowded.
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What does raising the temperature mean?
The particles gain more kinetic energy and move around more quickly.
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What does pressure mean?
The particles are forced closer together
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What does collision frequency mean?
The number of successful collisions between reacting particles each second.
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What does a particle need to have, for a successful collision to occur?
Each particle must have enough energy to react
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How does a higher concentration affect rate of reaction?
The number of collisions per second increases as there are more particles likely to collide as there are more particles
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How does a higher temperature affect rate of reaction?
The reactants have more kinetic energy so collisions are more energetic and frequent, so more likely to be successful
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How does an increase in pressure affect rate of reaction?
Forces particles closer together so increases collision frequency
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What are explosions caused by?
Combustible powders
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What has the biggest surface area - Block or powder?
POWDER!
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When do reactions occur?
Reactant particles collide with sufficient energy
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Why do powders speed up rate of reaction?
Because they can spread through the mixture, increasing collision frequency
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Why can collisions only occur with particles on the surface?
The particles of the block are trapped inside, so they are not available to react
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Other cards in this set

Card 2

Front

What is a reactant?

Back

a substance that takes part in and undergoes change during a reaction

Card 3

Front

What is a product?

Back

Preview of the front of card 3

Card 4

Front

How can the rate of reaction be worked out?

Back

Preview of the front of card 4

Card 5

Front

What is a limiting reactant?

Back

Preview of the front of card 5
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