Physical chemistry

?
  • Created by: Kat098
  • Created on: 05-04-18 11:45
Enthalpy
the thermal energy that is stored in a chemical system
1 of 23
Conservation of energy
energy cannot be created or destroyed, only moved from one place to another
2 of 23
Exothermic reaction
Heat lost from reaction into surroundings. Negative enthaply
3 of 23
Endothermic reaction
Heat gain from surroundings. Postitive enthalpy
4 of 23
Enthalpy change
the energy change associated with a given reaction (kJmol^-1)
5 of 23
Activation energy
minimum energy required to start a reaction by breaking bonds in a reaction
6 of 23
Enthalpy change of formation
the energy change that takes place when one mole of a coompund is formed from its constitueent elements in their standard state under standard conditions
7 of 23
Enthalpy change of combustion
Energy change that takes place when 1 mole of a substance is completely combusted
8 of 23
Enthalpy change of neutralisation
energy change associated with the formation of one mole of water from a neutraliation reaction
9 of 23
Calorimetry
the quantitative study of energy change in a chemical reaction (q=mcT). q is heat exchanged with surroundings in J
10 of 23
Average bond enthalpy
mean energy needed for one mole of a given type of gaseous bonds to undergo homolytic fission
11 of 23
Hess' law
the enthalpy change in a chemical reaction is independent of the route it takes
12 of 23
Rate of reaction
the change in concentration of a reactsny or a product at a given time (moldm^-3s^-1)
13 of 23
Catalyst
a substance that increases the rate of a reaction without being used up during the process
14 of 23
Homogenous catalyst
A catalyst in the same phase as the reactant
15 of 23
Heterogeneous catalyst
catalyst in a different phase from the reactants
16 of 23
Biological catalysts
Catalysts found in nature, enzymes
17 of 23
The Boltzmann Distribution
the distribution of energies of molecules at a particular temperature
18 of 23
Reversible reaction
a reaction can take place in forward or reverse direction
19 of 23
Dynamic equilibrium
A closed systems the rate of forward reaction is equal to the rate of the reverse reaction and all chemicals have their concentrations maintained
20 of 23
Le Chatelier's Principle
When system in equilibrium is subjected to change, the position of equilibrium will shift to minimise the change
21 of 23
Eqilibrium constant, Kc
Kc gives a measure of where the equilibrium lays, giving a ratio between products and reactants (products conc./ reactants conc.)
22 of 23
Fermentation
Metabolic process in which an organism converts a carbohydrate into an alcohol or an acid
23 of 23

Other cards in this set

Card 2

Front

energy cannot be created or destroyed, only moved from one place to another

Back

Conservation of energy

Card 3

Front

Heat lost from reaction into surroundings. Negative enthaply

Back

Preview of the back of card 3

Card 4

Front

Heat gain from surroundings. Postitive enthalpy

Back

Preview of the back of card 4

Card 5

Front

the energy change associated with a given reaction (kJmol^-1)

Back

Preview of the back of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Enthalpy resources »