Energy Transfer in Reactions

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  • Created by: joshd
  • Created on: 01-04-14 20:32
What happens during a chemical reaction?
Old bonds are broken and new bonds are formed.
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What must be supplied to do what?
Energy must be supplied to break existing bonds - so bond breaking is an endothermic process.
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What is released when what happens?
Energy is released when new bonds are formed - so bond formation is an exothermic process.
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What is BOND BREAKING?
ENDOTHERMIC.
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What is BOND FORMING?
EXOTHERMIC
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What happens in EXOTHERMIC reaction?
The heat energy released in forming bonds in the products is greater than the energy used in breaking old bonds in the reactants.
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Give a full definition of an exothermic reaction?
An EXOTHERMIC reaction is one which overall GIVES OUT ENERGY to the surroundings in the form of heat, shown by a rise in temperature.
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What does burning fuels (combustion) dO?
It gives out a lot of heat - it's very exothermic. That's because making new bonds in the products (water and carbon dioxide) gives out much more energy than it takes to break the bonds in the fuel.
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What are also exothermic?
Explosions - lots of heat energy is released.
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What happens in an endothermic reaction?
The energy required to break old bonds in the reactants is greater than the heart energy released when new bonds are formed in the products.
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Give a full definition of an endothermic reaction.
An ENDOTHERMIC reaction is one which overall TAKES IN ENERGY from the surroundings in the form of heat, shown by a FALL OF TEMPERATURE.
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Give a couple of examples of the uncommon reactions:
-Photosynthesis uses light energy from the sun to convert carbon dioxide and water into glucose and oxygen.-As ammonium nitrate dissolves in water it takes in heat energy from its surroundings. This temperature change can be easily measured.
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Other cards in this set

Card 2

Front

What must be supplied to do what?

Back

Energy must be supplied to break existing bonds - so bond breaking is an endothermic process.

Card 3

Front

What is released when what happens?

Back

Preview of the front of card 3

Card 4

Front

What is BOND BREAKING?

Back

Preview of the front of card 4

Card 5

Front

What is BOND FORMING?

Back

Preview of the front of card 5
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