Hess's Law Essentials for AS Chemistry Actual Lesson Activity 2

Front

Hess's Law

Back

Energy change is independent of pathway.

Front

Enthalpy Change (ΔH)

Back

Heat change at constant pressure.

Front

Standard Enthalpy of Formation

Back

ΔH when 1 mole of compound forms from elements.

Front

Standard Enthalpy of Combustion

Back

ΔH when 1 mole of substance burns in oxygen.

Front

Hess's Law Equation

Back

ΔH1 = ΔH2 + ΔH3

Front

State Function

Back

Property independent of path taken.

Front

Endothermic Reaction

Back

Absorbs heat, ΔH > 0.

Front

Exothermic Reaction

Back

Releases heat, ΔH < 0.

Front

Bond Enthalpy

Back

Energy to break 1 mole of bonds.

Front

Calorimetry

Back

Measurement of heat change.