7. energy

Created by: Vicky Fursdon
Created on: 29-03-13 12:36

What type of reactions can their energy released can be measured by tempuratu

Water + solids and neutralizing reactions (chemical)

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Define exothermic reaction:

gives heat out to the environment - Bond forms, as the energy released from the the bond forming is more than the energy needed to break the bond

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define endothermic reaction:

takes heat out of the environment - breaking bonds, as the energy needed to break the bond is more than the energy released when the bond is formed

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What is calorimetry?

It shows that amount of energy in a fuel, this is done by burning the fuel for a over water for a certain change in temperature of water

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What is the equation for the energy transferred?

Energy transferred (j) = Mass of water (g) X Specific heat capacity of water (4.2) X Change in temperature (oc)

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What is the activation energy?

The minimum amount of energy that is needed for the reaction to start

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What does a catalyst do?

lowers the activation energy and it doesn't affect the amount of product

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What are combustion engines?

The hydrogen gas is burnt with oxygen which is the fuel for the engine and it's only bi-product is water

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What is a a fuel cell?

It is an electrical cell that's supplied with a fuel and oxygen and uses energy from the reaction between them to generate electricity

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what are the pro's and con's of fuel cells?

Pro's - it doesn't produce greenhouse gases and mean's cities won't be as dependent on crude oil/ con's - hydrogen is explosive so it's hard to hold and it takes up more room to store and it takes electricity to extract it from the original source

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Other cards in this set

Card 2

Front

Define exothermic reaction:

Back

gives heat out to the environment - Bond forms, as the energy released from the the bond forming is more than the energy needed to break the bond

Card 3

Front

define endothermic reaction:

Back

Card 4

Front

What is calorimetry?

Back

Card 5

Front

What is the equation for the energy transferred?

Back

View more cards

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7. energy