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iGCSE Chemistry > Energetics > Flashcards

Energetics Flashcards

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1
Q

What is an enthalpy change?

A

Is the heat energy a reaction releases or absorbs per mole

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2
Q

Endothermic

A

Positive +

Heat energy is absorbed

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3
Q

Exothermic

A

Negative -

Heat energy is released

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4
Q

Breaking bonds…

A

Absorbs energy

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5
Q

Making Bonds…

A

Releases energy

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6
Q

What is Bond energy?

A

The amount of heat energy absorbed/released when bonds are broken or made

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7
Q

How do you calculate ΔH

A

Bonds Broken - Bonds Made

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8
Q

What is calorimetry?

A

AN experimental method used to measure an enthalpy change

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9
Q

Formula for calculating Heat Energy (Q)?

A

Q = m x c x ΔT

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10
Q

Formula for calculating enthalpy change?

A

ΔH = -Q/moles

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11
Q

What happens in a combustion calorimetry?

A

Combustion of fuel to heat up water

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12
Q

Two errors of Combustion Calorimetry?

A

Heat loss - Heat energy dissipates into air rather than water

Incomplete combustion - Less heat energy released

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13
Q

What is Solution Calorimetry?

A

Reaction happens dissolved in water

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14
Q

What are 3 errors from solution calorimetry?

A

Heat Loss - heat energy dissipates into air rather than water

Incomplete combustion - less heat is released than expected

Impure water - SHC is no longer exactly 4.18

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15
Q

Calorimetry experiment:

Temperature decreases…

A

Reaction absorbs heat energy from water

Water cools down

Endothermic Reaction

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16
Q

Calorimetry experiment:

Temperature increases…

A

Heat energy is released

Water is heated

Exothermic Reaction

iGCSE Chemistry (14 decks)

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