Starter quiz
Which label is missing from this reaction profile?- reaction
- energy
- reactants ✓
- products
- activation energy
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Which label is missing from the y-axis on this reaction profile?- 'energy' ✓
- Catalysts provide an alternative route for a reaction with a lower activation energy. What is activation energy?
- the energy all reactant particles contain
- the maximum energy that particles can contain
- the minimum energy that particles can contain
- the maximum energy that the particles must have in order to react
- the minimum energy that the particles must have in order to react ✓
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- Which of the following is an example of an enzyme?
- iron
- platinum
- lipase ✓
- aluminium
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- How could we increase the rate of a chemical reaction?
- by decreasing the frequency of successful collisions
- by increasing the frequency of successful collisions ✓
- lowering the temperature so that particles have less energy
- raising the temperature so that particles have more energy ✓
- providing a pathway for particles to react with a lower activation energy ✓
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- Catalysts have many uses, such as being used in catalytic converters in cars. Which of the following statements about catalysts are correct?
- Catalysts have to be replaced after each reaction.
- Catalysts are not used up in chemical reactions. ✓
- Catalysts increase the rate of reaction. ✓
- Catalysts decrease the rate of reaction.
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Exit quiz
- Which of the following will increase the rate of a chemical reaction?
- increasing the concentration of reacting solutions ✓
- decreasing the surface area of a solid reactant
- decreasing the temperature
- adding a catalyst ✓
- increasing the pressure of reacting gases ✓
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- How does a catalyst affect the activation energy of a reaction?
- it increases the activation energy
- it decreases the activation energy ✓
- it eliminates the activation energy
- it has no effect on the activation energy
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- What are enzymes?
- chemical catalysts made in laboratories
- biological catalysts that speed up reactions in living organisms ✓
- catalysts that decrease reaction rates
- catalysts that increase the activation energy
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- Which of the following statements about catalysts are correct?
- Catalysts all have the same efficiency.
- Qualitative data can be used to evaluate the effectiveness of catalysts. ✓
- When a catalyst is present more collisions between reactants result in a product ✓
- When a catalyst is present less collisions between reactants result in a product
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- Why are catalysts important in industrial processes?
- they slow down reactions to save energy
- they are expensive and increase costs
- they increase the reaction rate and reduce energy consumption ✓
- they are used up, adding to waste
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Which label shows the activation energy for the reaction when a catalyst has been used?- A
- B
- C ✓
- D
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Worksheet
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Lesson Details
Key learning points
- A catalyst affects the reaction rate without being used up.
- A catalyst reduces the activation energy needed for a reaction.
- With a catalyst present, more collisions between reactants result in the formation of product(s).
- Enzymes are biological catalysts.
- Catalysts vary in efficiency; qualitative data helps evaluate effectiveness.
Common misconception
Catalysts increase the amount of product formed.
Catalysts do not affect the quantity of products formed. They increase the rate at which the products are formed.
Keywords
Catalyst - A catalyst is a chemical that increases the rate of a reaction without itself being used up.
Activation energy - The minimum energy that the particles must have in order to react is known as the activation energy.
Reaction profiles - Reaction profiles are diagrams that show the energy of the reactants and products in a chemical reaction.
Qualitative data - Qualitative data is information that describes qualities or characteristics that cannot be measured with numbers.
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