General Chemistry Answers

3. Use the changes in oxidation numbers to identify which atoms are oxidized and which are reduced in each reaction:

a. 2H2 (g) + O2(g) →2H2O(l)

b. 2KNO3(s)→2KNO2(s)+ O2(g)

c. NH4NO2(s) →N2(g) + 2H2O(g)

1. For the reaction, H2O(l)⟶H2O(g), calculate ΔG at a) 20oC, b) 100oC and c) 150oC.

2. Calculate the standard-free energy changes for the reaction 2MgO(s) + 2Mg(s) + O2(g) at 25oC .

Which if the following cells will produce the highest voltage? Show your work.

A. Mn I Mn^2+ II Zn^2+ I Zn

B. Zn I Zn^2+ II Ni^2+ I Ni

C. Ni I Ni^2+ II Cu^2+ I Cu

—————————— will produce the highest voltage.

Write the correct name for each of the following structures.

A. CH3CH2CH2CH2CH3

B. CH3CH = CHCH2CH3

C. CH4CH2C = CCH3

Write the correct name for each of the following structures.

A. CH3CH2CH = CHCH2CH2CH = CH2

B. CH3CH2C = CCH2CH3

if 500,000 kj of heat are released by the reaction, how grams of C12H26 must have been consumed

For the following overall cell reaction, write the oxidation and reduction half-reactions, calculate the standard cell potential, E^0cell and determine if the reaction is spontaneous or not. Show your work.

Fe^3+(aq) + Cu^+(aq) —> Fe^2+(aq) + Cu^2+(aq)

Use the IUPAC rules to name the following structures:

A. CH3

I

CH3CH2CH2CH2CHCH3

I

CH2

I

CH3

B. CH3

I

CH2CH2CH2CH2CH2CH2CH3

Draw the structure of each of the following alkanes.

A. 2,3,4 - trimethylpentane

B. 2 - methylheptane

Calculate the standard entropy values for the following reactions at 25°C.

1. N2(g) + 3H2(g) ⟶ 2NH3(g)

2. H2(g) + Cl2(g) ⟶ 2HCl(g)

3. 2CO2(g) + O2(g) ⟶ 2CO2(g)

4. 3O2(g) ⟶ 2O3(g)

5. 2NH3 (g) + CO2 (g) ⟶ NH2CONH2 (aq) H2O(l)