Chemistry C2 4.7 Exothermic and endothermic reactions

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Where may energy be transferred in a reaction?
Energy may be transferred to or from the reacting substances in a reaction.
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What is a reaction in which energy is transferred from the reacting substances to their surroundings called?
An exothermic reaction.
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What is an endothermic reaction?
A reaction in which energy is transferred to the reacting substances from their surroundings.
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What happens when chemical reactions take place?
Energy is transferred as bonds are broken and made.
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What is an exothermic reaction?
A reaction that transfers energy to the surroundings.
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What happens to he surroundings during an exothermic reaction?
The energy transferred often heats up the surroundings and so the temperature increases.
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What examples of exothermic reactions are there?
Combustion, such as burning fuels; oxidation reactions, such as respiration; neutralisation reactions involving acids and bases.
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What chemical reaction takes in energy from the surroundings?
An endothermic reaction.
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What can happen when an endothermic reaction takes energy from the surroundings?
Some cause a decrease in temperature and others require a supply of energy, when some solid compounds are mixed with water the temperature decreases because endothermic changes happen as they dissolve.
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Why do thermal decomposition reactions need to be heated continuously?
To keep the reaction going.
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How can you tell that burning natural gas is an exothermic reaction?
It transfers energy to the surroundings/heats the surroundings.
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What are the two ways that show that a reaction is endothermic?
Either it cools the surroundings or it needs to be heated to keep it going.
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**MAKE SURE YOU CAN RECOGNISE A REACTION AS EXOTHERMIC OR ENDOTHERMIC FROM TEMPERATURE CHANGES PROVIDED**
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Card 2

Front

What is a reaction in which energy is transferred from the reacting substances to their surroundings called?

Back

An exothermic reaction.

Card 3

Front

What is an endothermic reaction?

Back

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Card 4

Front

What happens when chemical reactions take place?

Back

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Card 5

Front

What is an exothermic reaction?

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