# The rate and extent of chemical changes

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Calculating rates of reaction
Calculating rates of reaction
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What is the equation for the rate of chemical reaction (1):
Rate = quantity of reactant used/ time taken
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What is the equation for the rate of chemical reaction (2):
Rate = quantity of product formed/ time taken
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What can the quantity of reactant or product be measured by?
Mass in grams or volume in cm3
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What is the units for rate of reaction in moles?
Moles per second (mol/s)
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Factors which affect the rates of chemical reactions
Factors which affect the rates of chemical reactions
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Give 1 factor that affects the rate of reactions and explain how:
Temperature- the higher the temperature, the quicker the rate of reaction
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Give 1 factor that affects the rate of reactions and explain how:
Concentration- the higher the concentration, the quicker the rate of reaction
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Give 1 factor that affects the rate of reactions and explain how:
Surface area- the larger the surface area of a reactant solid, the quicker the rate of reaction
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Give 1 factor that affects the rate of reactions and explain how:
Pressure (of gases)- When gases react, the higher the pressure upon them, the quicker the rate of reaction
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Collision theory and activation energy
Collision theory and activation energy
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According to collision theory when can chemical reactions only occur?
When reacting particles collide with each other with sufficient energy
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What is activation energy?
This is the minimum amount of energy colliding particles in a reaction need in order to react
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By increases the temperature, what happens?
It increases the frequency of collisions and makes the collisions more energetic, therefore increasing the rate of reaction
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By increases the concentration, pressure and surface area what happens?
It increases the frequency of collisions, therefore increasing the rate of reaction
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Catalysts
Catalysts
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What does a catalyst do?
A catalyst changes the rate of a chemical reaction but is not used in the reaction
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What are enzymes?
These are biological catalysts
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How do catalysts increse the rate of reaction?
Catalysts provide a different reaction pathway where reactants do not require as much energy to react when they collide
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## Other cards in this set

### Card 2

#### Front

What is the equation for the rate of chemical reaction (1):

#### Back

Rate = quantity of reactant used/ time taken

### Card 3

#### Front

What is the equation for the rate of chemical reaction (2):

### Card 4

#### Front

What can the quantity of reactant or product be measured by?

### Card 5

#### Front

What is the units for rate of reaction in moles?