Understanding
System vs Surroundings System: the reactants ALONE e.g. NaOH and HCl Surroundings: everything else, e.g. beaker, water, thermometer, cup
- surroundings is not directly involved in the chemical reaction while the system is
Energy Changes
Reactions
Exothermic and Endothermic Reactions
Enthalpy Change
Energy Level Diagrams
Energy Profile Diagrams
Mole + Stoichiometry in Energetics
Mole + Stoichiometry in Energetics
Combustion of Fuels
Fuel Cells
Answer Techniques
Explaining Why Reaction is Endo/Exo
- State that bond breaking is endo and bond making is exo
- State energy of products higher/lower than reactants
- State whether energy taken in from surr to system for breaking bonds in xx mol of xxx compound is more/less than energy released from system to surr. to make new bonds to form xxx mol of xxx compound
- Net energy transfer from system to surr / surr to system
- Positive/Negative enthalpy change.
- Thus Endo/Exo
Important
important to state direction of energy movement ; taken in or given out