Chemistry AS Developing Fuels

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What is an exothermic reaction?
Gives out heat from surroundings deltaH = Negative
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What is an Endothermic reaction?
Takes in heat from the surroundings deltaH = Positive
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What is the standard enthalpy change of combustion?
Is the enthalpy change when 1 mole of a substance burns completely in oxygen under standard conditions
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What are the standard conditions?
1 Atmosphere pressure, 298K, 25c
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What is the standard enthalpy change of combustion?
Is the enthalpy change when 1 mole of a substance is formed from its constituent elements
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What is Entropy?
Entropy is the measure of the number of ways in which particles can be arranged
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True or False - 'Gases have greater entropy than liquids'
TRUE!
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True or False - 'Mixtures have a greater entropy than the unmixed constituents'
TRUE!
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What is the definition for Hess's Law?
Hess's law states that as long as the starting and finishing points are the same, the enthalpy change for a chemical reaction will always be the same, no matter how you go from start to finish.
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What is Bond Enthalpy?
Bond Enthalpy is the average energy required to break the bonds in 1 Mole of gaseous compounds.
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True Or False - 'The greater the bond enthalpy, the stronger the bond'
TRUE!
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True Or False - 'C=C is shorter and stronger than C-C'
TRUE!
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True Or False - 'Short bonds are stronger than long bonds'
TRUE!
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Other cards in this set

Card 2

Front

What is an Endothermic reaction?

Back

Takes in heat from the surroundings deltaH = Positive

Card 3

Front

What is the standard enthalpy change of combustion?

Back

Preview of the front of card 3

Card 4

Front

What are the standard conditions?

Back

Preview of the front of card 4

Card 5

Front

What is the standard enthalpy change of combustion?

Back

Preview of the front of card 5
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