Rate of reaction

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  • Created by: ahmes033
  • Created on: 03-12-13 10:25
How can rate of reaction be measured?
The rate of a reaction can be measured by the rate at which a reactant is used up, or the rate at which a product is formed.
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factors which affect the rate of a reaction?
The temperature, concentration, pressure of reacting gases, surface area of reacting solids, and the use of catalysts
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Chemical reactions can only happen if...
if reactant particles collide with enough energy. The more frequently particles collide, and the greater the proportion of collisions with enough energy, the greater the rate of reaction.
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Measuring rates
Different reactions can happen at different rates. Reactions that happen slowly have a low rate of reaction. Reactions that happen quickly have a high rate of reaction.
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Equation for rate of reaction
Amount of reactants uses or amount produced ÷ time taken
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Rate of reactions increases if ...
The temperature is increased, the concentration of a dissolved reactant is increased, the pressure of a reacting gas is increased, solid reactants are broken into smaller pieces, a catalyst is used
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What is needed for a chemical reaction to happen?
reactant particles must collide. Collisions with too little energy do not produce a reaction.
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What is activation energy?
The minimum energy needed for particles to react
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What will happen with changing concentration and pressure?
There are more reactant particles in the same volume, there is a greater chance of the particles colliding, the rate of reaction increases.
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What will happen with change particle size?
Its surface area is increased, more particles are exposed to the other reactant, there is a greater chance of the particles colliding, the rate of reaction increases
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What will happen with increase of temperature?
The reactant particles move more quickly, more particles have the activation energy or greater, The particles collide more often, and more of the collisions result in a reaction, the rate of reaction increases
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What do catalysts do?
Catalysts increase the rate of reaction without being used up. They do this by lowering the activation energy needed. With a catalyst, more collisions result in a reaction, so the rate of reaction increases. Different reactions need different catalys
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Card 2

Front

factors which affect the rate of a reaction?

Back

The temperature, concentration, pressure of reacting gases, surface area of reacting solids, and the use of catalysts

Card 3

Front

Chemical reactions can only happen if...

Back

Preview of the front of card 3

Card 4

Front

Measuring rates

Back

Preview of the front of card 4

Card 5

Front

Equation for rate of reaction

Back

Preview of the front of card 5
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