4.7 Exothermic And Endothermic Reactions Flashcards Preview

GCSE Chemistry 2.4 Rates And Energy > 4.7 Exothermic And Endothermic Reactions > Flashcards

Flashcards in 4.7 Exothermic And Endothermic Reactions Deck (8)
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1

What are reactions that transfer energy to the surroundings called? Do they make or break bonds?

Exothermic reactions, they make bonds which releases energy so the surrounding temp increases

2

Name 3 types of exothermic reactions:

•combustion, such as burning fuels
•oxidisation, such as respiration
•neutralisation reactions involving acids and bases

3

How can you tell that burning a natural gas is an exothermic reaction?

It heats the surroundings

4

What are reactions that transfer energy from the surroundings called? Do they make or break bonds?

Endothermic reactions, they break bonds which requires energy so the temp decreases

5

Name an endothermic reaction

Thermal decomposition

6

Why do thermal decomposition reactions need to be heated continuously to keep the reaction going?

They need lots of energy to break the bonds so need lots of heat energy or the reaction will stop completely

7

What are the 2 ways that show a reaction is endothermic?

•cools the surroundings
•needs to be heated to keep going

8

Why is energy transferred in chemical reactions?

Bonds are broken and made