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Chemistry AQA > C7 > Flashcards

C7 Flashcards

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1
Q

examples of endothermic reactions

A

photosynthesis

thermal decomposition

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2
Q

examples of exothermic reactions

A

combustion

neutralisation

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3
Q

uses of endothermic changes

A

treating injuries with cold packs

keeping drinks cans cold

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4
Q

which endothermic change is used in cold packs?

A

dissolving ammonium nitrate in water

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5
Q

formula for ammonium nitrate

A

NH4 NO3

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6
Q

chemical reaction that takes place in a hand warmer

A

exothermic, oxidation of iron, which forms hydrated iron oxide

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7
Q

how does a reusable hand warmer work

A

saturated solution
crystallises by pressing metal disk
crystals spread through solution, transferring energy to surroundings

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Chemistry AQA (4 decks)

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