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Energy Changes

energy-changes

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If a product stores

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energy than the

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then it must've transferred energy

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the surroundings. This is called an

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reaction. These reactions are showns by a

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If a product stores

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energy than the

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then it must've

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energy from the

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this is called an

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reaction, which is shown by a

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Which of these is an example of an exothermic reaction?

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Which of these is an example of an endothermic reaction?

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What is activation energy?

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What do reaction profiles show?

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In endothermic reactions, products have

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energy as it is

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by the surroundings.

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In exothermic reactions, products have

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energy as it is

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into the surroundings.

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Bond breaking is

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and more energy is used to

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Bond making is

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and more energy is

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to form bonds.

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Why are bond energies used?

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Overall energy change=

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The voltage of a cell depends on the type of

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and

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What do fuel cells use?

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Put these in the correct order as to how a hydrogen fuel cell works, from first to last

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Oxygen enters the cathode compartment
The oxygen is reduced, reacting with the H+ ions
Water is produced
The creates an electric current
Hydrogen enter the anode compartment
The H+ ions move towards the cathode
The hydrogen is then oxidised to form H+ ions

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