Chemistry C3 3.3 Energy level diagrams.

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What can be shown on energy level diagrams?
The relative difference in the energy of reactants and products.
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What do catalysts provide?
A pathway with a lower activation energy so the rate of reaction increases.
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What type of reaction is bond breaking?
Endothermic.
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What type of reaction is bond making?
Exothermic.
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In what direction do endothermic changes go in an energy level diagram?
Up (energy in).
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In what direction do exothermic changes go in an energy level diagram?
Down (energy exits).
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What is the difference between energy levels of reactants and products?
The energy change for the reaction.
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How can we show energy changes for chemical reactions?
On energy level diagrams.
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What must occur for a chemical reaction to take place?
Bonds must be broken, this is endothermic because energy is taken in.
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What is the minimum energy needed for the reaction to happen called?
The activation energy.
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What happens when new bonds in the products are formed?
Energy is released and so this is exothermic.
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How can we show the activation energy and how the energy changes during a reaction?
On an energy level diagram.
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What do catalysts do?
Increase the rate of a reaction by providing a different pathway with an activation energy that is lower.
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Card 2

Front

What do catalysts provide?

Back

A pathway with a lower activation energy so the rate of reaction increases.

Card 3

Front

What type of reaction is bond breaking?

Back

Preview of the front of card 3

Card 4

Front

What type of reaction is bond making?

Back

Preview of the front of card 4

Card 5

Front

In what direction do endothermic changes go in an energy level diagram?

Back

Preview of the front of card 5
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