Energy Changes

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What are reactions that give out energy called?
Reactions that give out energy - usually in the form of heat - are called exothermic reactions. They usually feel hot.
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What are reactions that take in energy called?
Reactions that take in energy from the surroundings - usually in the form of heat - are called endothermic reactions. They usually feel cold.
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How do you start a reaction?
To start a reaction, energy must be absorbed by the chemicals in order to break some of the chemical bonds in the reactants.
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What is activation energy?
The amount of energy needed to start a reaction
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What kind of process is breaking the bonds?
Breaking the chemical bonds in the reactants always requires energy – it is an endothermic process.
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What kind of process is making bonds?
Making new bonds in the products always releases energy – it is an exothermic process.
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How can you tell if a reaction is exothermic?
If more energy is released when new bonds are made than was absorbed to break the bonds in the reactants, then the reaction is exothermic.
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How can you tell if a reaction is endothermic?
If less energy is released when new bonds are made than was absorbed to break the bonds in the reactants, then the reaction is endothermic.
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Card 2

Front

What are reactions that take in energy called?

Back

Reactions that take in energy from the surroundings - usually in the form of heat - are called endothermic reactions. They usually feel cold.

Card 3

Front

How do you start a reaction?

Back

Preview of the front of card 3

Card 4

Front

What is activation energy?

Back

Preview of the front of card 4

Card 5

Front

What kind of process is breaking the bonds?

Back

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