Topic 2.1 Cards

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  • Created by: RobMeade
  • Created on: 05-03-16 19:58
What is an exothermic reaction
This is a reaction that releases energy to the surroundings there is a temperature rise and a negative enthalpy change
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What is an endothermic reaction
This is a reaction that takes energy from the surroundings, there is a decrease in temperature and a positive enthalpy change
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What is energetics?
This is the study of the changes in energy within a chemical reaction
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What is internal energy?
The sum of kinetic energy and potential energy
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What is kinetic energy
This is energy due to motion, in chemistry it is motion at a molecular level
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What is potential energy?
This arises due to the position of atoms in relation to each other.
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Why are there changes in energy? Explain when each different energy change occurs
In a chemical reaction bonds are broken and bonds are made.
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Give three examples of exothermic reactions
Metals with acids, In hand warmers, this is specifically the oxidation of iron and finally thermite reactions such as aluminum chloride with iron (3) oxide
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Give three examples of endothermic reactions
Ice melting (heat needs to be taken in to condense bonds), In cold packs (the dissolving of ammonium chloride in water) and thermal decompositon of group 2 carbonates
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What is enthalpy?
The total energy content of a system at constant pressure, usually heat.
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What is enthalpy change?
This is the amount of heat evolved or absorbed in a chemical reaction in constant pressure.
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What is the main formula to determine the enthalpy change of a reaction?
Enthalpy Change = Enthalpy products - Enthalpy reactants
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What is the chemical system?
This is the reactants and the products
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What is the surroundings?
The surroundings are everything but the chemical system
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Describe the principle conservation of energy?
This states the total energy within a system cannot be created or destroyed but can be transferred to other forms
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Other cards in this set

Card 2

Front

What is an endothermic reaction

Back

This is a reaction that takes energy from the surroundings, there is a decrease in temperature and a positive enthalpy change

Card 3

Front

What is energetics?

Back

Preview of the front of card 3

Card 4

Front

What is internal energy?

Back

Preview of the front of card 4

Card 5

Front

What is kinetic energy

Back

Preview of the front of card 5
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