C2.5 Exothermic and endothermic reactions Flashcards Preview

Chemistry: C2 > C2.5 Exothermic and endothermic reactions > Flashcards

Flashcards in C2.5 Exothermic and endothermic reactions Deck (10)
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1
Q

When chemical reactions occur…

A

Energy is transferred to or from the surroundings

2
Q

What is an exothermic reaction?

A

One that transfers energy to the surroundings, usually in the form of heat

3
Q

What are some examples of exothermic reactions?

A

Combustion, many oxidation reactions and neutralisation

4
Q

What are some everyday uses for exothermic reactions?

A

Self-heating cans and hand warmers

5
Q

What is an endothermic reaction?

A

One that takes energy from the surroundings, usually in the form of heat

6
Q

What is an example of an endothermic reaction?

A

Thermal decompositions

7
Q

What is an everyday use for an endothermic reaction?

A

A sports injury pack

8
Q

If a reversible reaction is exothermic in one direction…

A

it is endothermic in the opposite direction

9
Q

What is an example of a reversible reaction, which is endothermic one way

A

Heat blue hydrated copper sulfate crystals which when the water is dried off leaves white anhydrous copper sulfate powder

10
Q

What is an example of a reversible reaction, which is exothermic the other way

A

Add water to the white anhydrous copper sulfate powder to get the blue hydrated copper sulfate crystals back again