AP Chemistry Thermochemistry Review
1. Define and know: G, S, H, E, q, heat, temperature
2. State functions
3. Heat capacity, specific heat capacity, molar heat capacity
4. Solve for q in a heating or cooling curve
5. Hydrogen and chlorine gas forming hydrogen chloride gas; enthalpy of the reaction is -187.6 kJ. What is the enthalpy change for 80.00 g HCL. Write the correct reaction first. Then calculate. answer is 205.8 kJ
6. Sum of product - sum of reactants for any state function i.e. G,H, S
7. more moles of gas formed the higher the entropy
8. Remember to flip reactions and account for moles, given enthalpy with a + or - it will need to be changed also
9. At equilibrium Gibb's Free energy = zero i.e. boiling, melting etc., read pp 803-806.
10. Careful that units match i.e. Joules and kilojoules.
Be able to solve for:
. When 100.0 grams of a certain metal at 80.0 °C was mixed with 100.0 grams of water at 30.0 °C, the final equilibrium temperature of the mixture was 36.0 °C. What is the specific heat (Joules /gram °C) of the metal?
2. Determine the amount of energy released from 100.00 grams of steam at 110.0 C as it cools to –10.0 C. The specific heat of steam is 2.02 J/g C, the specific heat of liquid water is 4.18 J/ g C and the specific heat of ice is 2.06 J/ g C. The heat of fusion is 334.0 J/g and the heat of vaporization is 2260 J/ g C.
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