Last modified: Wed 12/31/1969 06:00:00 pm BCE

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Answer all of the questions below. If you do not know an answer enter CNA. However, it will help me the most if you answer each question with your best intuition/idea about what would be a reasonable answer.

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1. Which of the following equations represents a formation reaction?

a) HCl(aq) + NaOH(aq) ----> NaCl(aq) + H2O(l)

b) Mg(s) + 1/2O2(g) ----> MgO(s)

c) Mg(s) + Cu2+(aq) ----> Cu(s) + Mg2+(aq)

d) C3H8(g) + 5O2(g) ----> 3CO2(g) + 4H2O(l)

Indicate the letter of the equation that is the formation reaction.

2. Briefly, describe the characteristic feature(s) of any formation reaction.

3. Is the following equation which describes the conversion of water in the liquid phase to water in the vapor phase endothermic or exothermic?

H2O(l) ----> H2O(g)

Briefly explain your reasoning.

4. Consider the following two reactions

H2(g) + 1/2O2(g) ---> H2O(l) + 285.8 kJ

H2(g) + 1/2O2(g) ---> H2O(g) + 241.8 kJ

Manipulate the two equations to determine how much heat (in kJ) is absorbed or released for the equation.

H2O(l) ----> H2O(g)


5. Given the following reactions


Ho (kJ mol-1)

CH4(g) + 2O2(g) ----> CO2(g) + 2H2O(g)


2CH3OH(g) + 3O2(g) ----> 2CO2(g) + 4H2O(g)


Calculate the Ho for the reaction

CH4(g) + 1/2O2(g) ----> CH3OH(g)

kJ mol-1


6. Is there anything about the questions that you feel you do not understand? List your concerns/questions.

7. If there is one question you would like to have answered in lecture, what would that question be?