C7.3 Energy Changes in Chemistry

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What is an Exothermic Reaction?
Exothermic reactions give out energy to their surroundings. The energy of the products is less than the energy of the reactants.
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Give Some Examples of Exothermic Reactions.
Burning, Respiration, Reaction with dilute hydrochloric acid with sodium hydroxide solution.
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In Chemical Reactions New Bonds Are Made to Form Products. Describe the Process.
Creating new bonds to form products gives out energy, therefore making bonds is an exothermic reaction.
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What is an Endothermic Reaction?
Endothermic reactions take in energy from their surroundings. The energy of the products is greater than the energy of the reactants.
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Give Some Examples of Endothermic Reactions.
Photosynthesis, The reaction of solid citric acid with sodium hydrogen-carbonate solution.
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In Chemical Reactions Chemical Bonds in the Reactants Break. What Happens in this Process?
Breaking bonds takes in energy, meaning breaking bonds is an endothermic reaction.
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If the Value for an Energy Transfer is Negative, What Type of Reaction is it?
It is an Exothermic reaction. If it is a positive energy transfer it will be an Endothermic reaction.
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What is Activation Energy?
Every reaction needs a certain minimum energy before it can start, this is the activation energy, it is different for every reaction.
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Card 2

Front

Give Some Examples of Exothermic Reactions.

Back

Burning, Respiration, Reaction with dilute hydrochloric acid with sodium hydroxide solution.

Card 3

Front

In Chemical Reactions New Bonds Are Made to Form Products. Describe the Process.

Back

Preview of the front of card 3

Card 4

Front

What is an Endothermic Reaction?

Back

Preview of the front of card 4

Card 5

Front

Give Some Examples of Endothermic Reactions.

Back

Preview of the front of card 5
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