Summary
enthalpy module 3 summary
- Institution
- OCR
condensed notes on enthalpy profile diagrams, energy changes, enthalpy changes of combustion, formation and neutralisation, average bond enthalpy, hess' law.
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Some examples from this set of practice questions
1.
define enthalpy of combustion
Answer: enthalpy change when 1 mole of a substance undergoes complete combustion, under standard conditions, with all the reactants and products in their standard states
2.
define enthalpy of formation
Answer: enthalpy change when 1 mole of a compound is formed from its elements under standard conditions, with all the reactants and products in their standard states
3.
define enthalpy of neutralisation
Answer: enthalpy change when 1 mole of water is formed from an acid-base reaction
4.
what are the standard conditions ?
Answer: 25 degress Celsius 1 atm 1 mold dm-3
5.
what is meant by average bond enthalpy ?
Answer: energy required to break 1 mole of a specific type of covalent bond in a gaseous molecule, averaged over a range of compounds
Content preview
ENTHALPY PROFILE DIAGRAMSENDOTHERMIC
STANDARD ENTHALPY OF
COMBUSTION: 1 mole of a substance undergoes complete combustion in oxygen,
with all the reactants and products in their standard states, under standard
conditions (1 atm, 25 ℃)
FORMATION: 1 mole of a compound is formed from its elements with all the
reactants and products in their standard states, under standard conditions
NEUTRALISATION: 1 mole of water is formed in an acid-base reaction
ENERGY CHANGE
Of water / aqueous solution = 4.18 g-1 K-1
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