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Chemistry A Level > PC4 > Flashcards

PC4 Flashcards

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1
Q

What is enthalpy change?

A

The heat energy transferred in a reaction at constant pressure

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2
Q

What is bond enthalpy?

A

The energy needed to break a bond

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3
Q

What is mean bond enthalpy?

A

The average energy needed to break a certain type of bond, over a range of compounds

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4
Q

Define ‘standard enthalpy of formation’

A

The enthalpy change when 1 mole of a compound is formed from its elements in their standard states under standard conditions

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5
Q

Define ‘standard enthalpy of combustion’

A

The enthalpy change when 1 mole of a substance is completely burned in oxygen under standard conditions with all reactants and products in their standard states

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6
Q

Define ‘standard enthalpy change of reaction’

A

The enthalpy change when a reaction occurs in the molar quantities shown in the chemical equation, under standard conditions with all reactants and products in their standard states

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7
Q

What is Hess’s Law?

A

The total enthalpy change for a reaction is independent of the route taken

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Chemistry A Level (16 decks)

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