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Physical Chemistry > Enthalpy Changes > Flashcards

Enthalpy Changes Flashcards

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1
Q

What is an enthalpy change?

A

A change in energy

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2
Q

What symbol represents an enthalpy change?

A

ΔH

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3
Q

What does the ⦵ in ΔH⦵ mean?

A

The substances were in standard states and the measurements were taken under standard conditions

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4
Q

What are standard conditions?

A

100kPa pressure and a stated temperature

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5
Q

What is bond enthalpy?

A

The energy required to break a bond

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6
Q

How do you calculate the enthalpy change of a reaction?

A

total energy absorbed - total energy released

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7
Q

What is the standard enthalpy of formation?

A

ΔfH⦵ is 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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8
Q

What is the standard enthalpy of combustion?

A

ΔcH⦵ is the enthalpy change when 1 mole of a substance is completely burned in oxygen under standard conditions

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Physical Chemistry (2 decks)

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