Energetics
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What is an enthalpy change?
Is the heat energy a reaction releases or absorbs per mole
Endothermic
Positive + Heat energy is absorbed
Exothermic
Negative - Heat energy is released
Breaking bonds…
Absorbs energy
Making Bonds…
Releases energy
What is Bond energy?
The amount of heat energy absorbed/released when bonds are broken or made
How do you calculate ΔH
Bonds Broken - Bonds Made
What is calorimetry?
AN experimental method used to measure an enthalpy change
Formula for calculating Heat Energy (Q)?
Q = m x c x ΔT
Formula for calculating enthalpy change?
ΔH = -Q/moles
What happens in a combustion calorimetry?
Combustion of fuel to heat up water
Two errors of Combustion Calorimetry?
Heat loss - Heat energy dissipates into air rather than water Incomplete combustion - Less heat energy released
What is Solution Calorimetry?
Reaction happens dissolved in water
What are 3 errors from solution calorimetry?
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
Calorimetry experiment: Temperature decreases…
Reaction absorbs heat energy from water Water cools down Endothermic Reaction
Calorimetry experiment: Temperature increases…
Heat energy is released Water is heated Exothermic Reaction