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- understand the term enthalpy change
- be able to construct simple enthalpy level diagrams
- know that the enthalpy change is negative for exothermic reactions and positive for endothermic reactions
- know the definitions of standard enthalpy changes of reaction, formation, combustion, neutralisation and atomisation
- be able to use the experimental data from combustion experiments and experiments in which substances are mixed in insulated containers, such as polystyrene cups, to calculate the energy transferred in a reaction and hence the enthalpy change of the reaction
- be able to use the expression energy transferred = mass x specific heat capacity x temperature change to calculate the energy transferred in thermochemistry experiments
- be able to evaluate the results obtained from combustion experiments and experiments in which substances are mixed in insulated containers, and comment on the sources of error and assumptions in these experiments
- know and understand Hess’s Law
- be able to apply Hess’s Law in calculating enthalpy changes from data provided, or selected from tables, or obtained from experiments
- understand why standard conditions must apply to the tabulated data for enthalpy changes
- be able to plan and carry out experiments to determine the enthalpy change for reactions which cannot be measured directly
- understand the terms bond enthalpy and mean bond enthalpy
- be able to use mean bond enthalpies to calculate the enthalpy changes of reactions involving simple molecules
- recognise the limitations of using mean bond energies in calculations of enthalpy changes
- understand that bond enthalpy data can give some indication about which bond might break first in a reaction, how easy or difficult this is, and therefore how rapidly a reaction will take place.
mar 14 2014 ∞
oct 5 2014 +
oct 5 2014 +