Rate of reaction

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13 Terms

1
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What is rate of reaction?

The speed at which the products are formed from the reactants in a chemical reaction.

2
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What is a catalyst?

A substance that increases the rate of a chemical reaction without being used up

3
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Factors affecting rate of reaction

There are four factors that affect the rate (speed) of a chemical reaction:

  • temperature

  • concentration

  • particle size

  • use of a catalyst

4
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What is activation energy?

The minimum amount of energy needed to start a chemical reaction.

5
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How does temperature affect rate of reaction?

  • If the temperature is increased, the particles have more energy and so move quicker.

  • Increasing the temperature increases the rate of reaction because the particles collide more often and with more energy.

  • The higher the temperature, the faster the rate of a reaction will be.

<ul><li><p>If the temperature is increased, the particles have more energy and so move quicker.</p></li><li><p> Increasing the temperature increases the rate of reaction because the particles collide more often and with more energy.</p></li><li><p> The higher the temperature, the faster the rate of a reaction will be.</p></li></ul><p></p>
6
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How does concentration affect the rate of reaction?

  • If the concentration of reactants is increased, there are more reactant particles moving together.

  • There will be more collisions and so the reaction rate is increased.

  • The higher the concentration of reactants, the faster the rate of a reaction will be.

<ul><li><p>If the concentration of reactants is increased, there are more reactant particles moving together. </p></li><li><p>There will be more collisions and so the reaction rate is increased.</p></li><li><p> The higher the concentration of reactants, the faster the rate of a reaction will be.</p></li></ul><p></p>
7
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How does particle size affect the rate of reaction?

  • By decreasing the particle size of a reactant, we are increasing its surface area.

  • The smaller the particle size the faster the reaction.

  • The greater the surface area, the higher the chance of collisions, thus the faster the rate of reaction.

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How does a catalyst affect rate of reaction?

  • Provides an alternative reaction pathway

  • Has a lower activation energy

  • Increases the frequency of more successful collisions, because more particles have greater energy than the activation energy

9
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What is the equation that links time, mean rate and volume?

mean rate= volume/ time

mean rate= (cmÂł) / (s)

10
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List 2 things that are needed in order to have a successful collisions:

  • more frequent collisions

  • collisions have to have enough energy

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What is concentration?

The volume of particles in a given space (liquid).

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What is the equation for rate of reaction?

Rate of reaction= mass / time

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What is the equation used to measure the rate of reaction? (extension of question before)

mass of reactants lost / time

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