chemistry recations

section 2

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  • Created by: Tara
  • Created on: 09-03-13 17:32
Exothermic reaction definition
An EXOTHERMIC reaction is one which transfers energy to the surrounding, usually in the form of heat and usually shown in a rise of temperature.
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Exothermic examples
1) burning fuels is the best example of exothermic reactions- combustion 2) Neutralization reactions 3) many OXIDATION reactions are exothermic- sodium and water
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Exothermic uses
Exothermic reactions have lots of everyday uses. Hand warmers use the exothermic oxidation of iron in air to generate heat. self heating cans of coffee rely on exothermic reactions between chemicals and their bases.
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Endothermic reaction definition
An ENDOTHERMIC reaction is one which takes in energy from the surroundings, usually in the form of heat and usually shown by a fall in temperature.
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Endothermic examples
Endothermic reactions are much less common. Thermal decomposition are a good example: CaCO3 -> CaO + CO2 calcium carbonate decomposes to make quicklime.
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Endothermic uses
Endothermic reactions also have everyday uses. sports injury packs use endothermic reactions-they take in heat and the pack becomes very cold. More convenient than carrying ice around.
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Reversible reactions can be Endothermic and Exothermic.
In reversible reactions, if the reaction is endothermic in one direction, it will be exothermic in the other direction. The energy absorbed by the endothermic reaction reaction is equal to the energy released during exothermic reaction.
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Example of reversible reaction.
If you heat blue hydrated copper sulfate crystals it drives the water off and leaves white anhydrous copper sulfate powder. this is endothermic. If you then add a couple of drops of water to the white powder you get blue crystals back again- exo.
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Other cards in this set

Card 2

Front

1) burning fuels is the best example of exothermic reactions- combustion 2) Neutralization reactions 3) many OXIDATION reactions are exothermic- sodium and water

Back

Exothermic examples

Card 3

Front

Exothermic reactions have lots of everyday uses. Hand warmers use the exothermic oxidation of iron in air to generate heat. self heating cans of coffee rely on exothermic reactions between chemicals and their bases.

Back

Preview of the back of card 3

Card 4

Front

An ENDOTHERMIC reaction is one which takes in energy from the surroundings, usually in the form of heat and usually shown by a fall in temperature.

Back

Preview of the back of card 4

Card 5

Front

Endothermic reactions are much less common. Thermal decomposition are a good example: CaCO3 -> CaO + CO2 calcium carbonate decomposes to make quicklime.

Back

Preview of the back of card 5
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