Developing Fuels

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  • Created by: jesswatts
  • Created on: 07-01-16 12:48
What does Enthalphy mean?
Enthalphy is a measure of the total energy of a thermodynamic system.
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How can the enthalpy change of a reactant be calculated?
Enthalpy Change= Hproducts - Hreactants
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What does exotherimic reaction mean?
Heat is given out to its surroundings
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What does endothermic reaction mean?
Heat is taken in from its surroundings
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What is standard enthalpy change of combustion?
It is the enthalpy change that occurs when one mole of a substance is burned completly in oxygen under standard conditions.
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What is the enthalpy change of a reaction?
The enthalpy change is when molar quantities of reactants as stated in the equation together under standard conditions.
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What is the enthalpy change of neutralisation?
The enthalpy change is when one mole of H+ reacts with one mole of OH- to form one mole of water under standard conditions.
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What is the standard enthalpy change of formation?
It is the enthalpy change that occurs when one mole of a compound is formed from its elements under standard conditions.
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Why do we extrapolate graphs?
We extrapolate graphs to minimise heat loss. (The temperature we would have reached with no heat loss)
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What is Hess' Law
It is the enthalpy change for a reaction that is independent of the pathway taken between the initial and final states.
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State the factors for Bond Breaking
All reactant bonds. Energey is taken in. Endothermic. Positive H values.
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State the factors for Bond forming
All product bonds. Energy is given out. Exothermic. Negative H values.
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What is Cracking?
The breaking down of long hydrocarbons into smaller ones. Using heat and a catalyst.
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What is a catalyst?
Catalysts speed up the rate of a reaction and can be recovered at the end of the reaction.
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What is a homogenous catalyst?
When the reactants are in the same state as the catalyst
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What is a hetrogenous catalyst?
Catalyst is in a different state to the reactants. The reaction takes place on a catalyst surface.
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Card 2

Front

How can the enthalpy change of a reactant be calculated?

Back

Enthalpy Change= Hproducts - Hreactants

Card 3

Front

What does exotherimic reaction mean?

Back

Preview of the front of card 3

Card 4

Front

What does endothermic reaction mean?

Back

Preview of the front of card 4

Card 5

Front

What is standard enthalpy change of combustion?

Back

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