Chemistry: Year 10 Term 2: Usages of Energy Transfers

What reactions are used in hand warmers? (1)
Exothermic
1 of 10
Which hand warmer reactions means they cannot be reused? (1)
Oxidation of iron
2 of 10
What is the catalyst for non-reusable hand warmers? (1)
Salt (NaCl)
3 of 10
Which hand warmer reactions mean they can be reused? (1)
Formation of crystals from salt solution
4 of 10
What is the catalyst for reusable hand warmers? (1)
Metal
5 of 10
How are they reused? (2)
Crystals redissolved in hot water so can be reactivated
6 of 10
What reactions are used in self-heating cans? (1)
Endothermic
7 of 10
What is the chemical reaction used in self-heating cans and how is this triggered? (2)
Calcium oxide + water -> Calcium hydroxide, a button which break a seal and allows reactants to mix
8 of 10
Cold packs use what reactions? (1)
Endothermic
9 of 10
What is the reaction used in cold packs and how is it started? (1)
Ammonium nitrate + water, squeezed to break barrier
10 of 10

Other cards in this set

Card 2

Front

Which hand warmer reactions means they cannot be reused? (1)

Back

Oxidation of iron

Card 3

Front

What is the catalyst for non-reusable hand warmers? (1)

Back

Preview of the front of card 3

Card 4

Front

Which hand warmer reactions mean they can be reused? (1)

Back

Preview of the front of card 4

Card 5

Front

What is the catalyst for reusable hand warmers? (1)

Back

Preview of the front of card 5
View more cards

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