Energy from reactions

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What is an exothermic reaction?
A reaction that releases energy to the surroundings
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What is an endothermic reaction?
A reaction that takes in heat
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What can simple calorimetry be used for?
Measuring the relative amounts of energy released when substances burn
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How can the amount of energy released or absorbed by a chemical reaction be calculated?
From the measured temperature change of the solution and using the equation Q = mc /\ T
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What can we show with energy level diagrams?
The relative difference in the energy of the reactants and products on energy level diagrams
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What do catalysts do?
They lower the activation energy so a greater proportion of reactant particles have enough energy to react
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Is bond making exo or endothermic?
Exothermic
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Is bond breaking exo or endothermic?
Endothermic
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In an exothermic reaction is the energy released from forming bonds greater all smaller than the energy needed to break existing bonds?
Greater
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In an endothermic reaction is the energy needed to break existing bonds greater all smaller than the energy released from forming new bonds?
greater
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Word equation for the combustion of hydrogen
Hydrogen + oxygen -> water
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How can hydrogen be used as a fuel?
Either burned in combustion engines or used in fuel cells to power engines
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Other cards in this set

Card 2

Front

What is an endothermic reaction?

Back

A reaction that takes in heat

Card 3

Front

What can simple calorimetry be used for?

Back

Preview of the front of card 3

Card 4

Front

How can the amount of energy released or absorbed by a chemical reaction be calculated?

Back

Preview of the front of card 4

Card 5

Front

What can we show with energy level diagrams?

Back

Preview of the front of card 5
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