3.2 Key Terms

3. a diagram of a reaction that allows you to compare the enthalpy of the reactants with the products (8, 7, 7)
9. a reaction in which the enthalpy of the products is smaller than the enthalpy of the reactants (9)
11. the quantitative study of energy change in a chemical reaction (11)
13. the energy change that takes place when 1 mole of a substance is completely combusted, under standard conditions (8, 6, 2, 10)
17. the energy required to raise 1g of a substance by 1K (8, 4, 8)
18. the distribution of energies of molecules at a particular temperature, often shown as a graph (9, 12)
19. states that the enthalpy change in a chemical reaction is independent of the route it takes (4, 3)

1. a reaction in which the enthalpy of the products is greater than the enthalpy of the reactants (10)
2. a catalyst used in a reaction which is in the same phase as the reactant (10)
4. a catalyst used in a reaction which is in a different phase to the reactants (12)
5. exists in a closed system when the rate of the forward reaction is equal to the rate of the reverse reaction (7, 11)
6. the energy change associated with the formation of 1 mole of water from a neutralisation reaction, under standard conditions (8, 6, 2, 9)
7. the energy change that takes place when 1 mole of a compound is formed from its constituent elements in their standard state, under standard conditions (8, 6, 2, 9)
8. the mean energy needed for 1 mole of a given type of gaseous bonds to undergo homolytic fission (7, 4, 8)
10. the change in concentration of a reactant or product in a given time (4, 2, 8)
12. the energy change associated with a given reaction (8, 6, 2, 8)
14. when a system in dynamic equilibrium is subjected to a change, the position of equilibrium will shift to minimise the change (2, 10, 9)
15. gives the position of where equilibrium lays, by giving the ratio between products and reactants (11, 8)
16. the minimum energy required to start a reaction by breaking bonds in the reactants (10, 6)