CHEM 130 Final Examination Questions And Answers Latest Update 2026 With Complete
Solution Rio Salado College 100% pass
I. Multiple choice (5 pts each, 65% of exam): Select the best answer (A – E) for
each question. Only the Scantron will be graded for this portion of the exam.
Report your answers on the Scantron form.
1. A 1.0-mol sample of liquid water at 21 °C is subjected to 5.2 kJ of heat. What
happens? The molar heat capacity of water is 75.40 J/mol °C and the enthalpy of
vaporization is 40.65 kJ/mol.
a. The water warms to a final temperature less than 100 °C.
b. The water warms to 100 °C and begins to evaporate.
c. The water warms to a final temperature less than 100 °C and begins to
condense.
d. The water warms to 100 °C and completely evaporates.
e. The water completely evaporates and the vapor temperature is above
100 °C.
2. Which of the molecules below would have the longest bond length, based on
molecular orbital theory? MO valence electron configurations are given.
a. O2+; (σ2s)2 (σ2s*)2 (σ2p)2 ( π2p)4 (π2p*)1
b. O2; (σ2s)2 (σ2s*)2(σ2p)2 (π2p)4 (π2p*)2
c. O2–; (σ2s)2 (σ2s*)2(σ2p)2 (π2p)4 (π2p*)3
d. F2; (σ2s)2 (σ2s*)2 (σ2p)2 (π2p)4 (π2p*)4
e. The bonds are all the same length.
1
,CHEM 130 FINAL EXAM
3. Select the answer choice below that correctly ranks the following elements from
largest to smallest radius. Ti, Cr, K, Ge
a. Ti > Cr > Ge > K
b. Ge > Cr > Ti > K
c. K > Ti > Cr > Ge
d. K > Ti > Ge > Cr
e. Cr > K > Ge > Ti
4. The value of KP for the reaction below is 1.6 at 308 K.
NH4HS(s) ⇌ NH3(g) + H2S(g)
Initially, 0.50 mol of each of NH4HS, NH3, and H2S is added to a 2.0-L container.
How many moles of NH3 are present at equilibrium?
a. 0.10 mol NH3
b. 0.20 mol NH3
c. 1.3 mol NH3
d. 2.6 mol NH3
e. 5.1 mol NH3
2
, CHEM 130 FINAL EXAM
5. You are preparing 15.0 mL of a solution that is 3.10 M chloride ion. (Assume the
concentration of the cation is irrelevant for this experiment.) You have a
concentrated stock solution that is 5.00 M CaCl2. What volume (in mL) of water will
you add to prepare this 15.0-mL solution?
a. 4.65 mL
b. 5.70 mL
c. 9.3 mL
d. 10.4 mL
e. 15 mL
6. A 50-mL sample of 3.0 M hydrofluoric acid is titrated with sodium hydroxide.
How many moles of sodium hydroxide are consumed when the endpoint is reached?
a. 150 moles
b. 0.15 moles
c. 3.0 moles
d. 0.30 moles
e. 0.50 moles
7. Given the chemical reaction below, which of the reference values listed is NOT
needed in order to calculate the lattice energy for NaCl?
Cl2(g) + 2 Na(s) → 2 NaCl(s)
a. bond dissociation energy of Cl2
b. ionization energy of Na
c. electron affinity of Cl
d. energy of sublimation for Na
e. enthalpy of fusion for NaCl
3
Solution Rio Salado College 100% pass
I. Multiple choice (5 pts each, 65% of exam): Select the best answer (A – E) for
each question. Only the Scantron will be graded for this portion of the exam.
Report your answers on the Scantron form.
1. A 1.0-mol sample of liquid water at 21 °C is subjected to 5.2 kJ of heat. What
happens? The molar heat capacity of water is 75.40 J/mol °C and the enthalpy of
vaporization is 40.65 kJ/mol.
a. The water warms to a final temperature less than 100 °C.
b. The water warms to 100 °C and begins to evaporate.
c. The water warms to a final temperature less than 100 °C and begins to
condense.
d. The water warms to 100 °C and completely evaporates.
e. The water completely evaporates and the vapor temperature is above
100 °C.
2. Which of the molecules below would have the longest bond length, based on
molecular orbital theory? MO valence electron configurations are given.
a. O2+; (σ2s)2 (σ2s*)2 (σ2p)2 ( π2p)4 (π2p*)1
b. O2; (σ2s)2 (σ2s*)2(σ2p)2 (π2p)4 (π2p*)2
c. O2–; (σ2s)2 (σ2s*)2(σ2p)2 (π2p)4 (π2p*)3
d. F2; (σ2s)2 (σ2s*)2 (σ2p)2 (π2p)4 (π2p*)4
e. The bonds are all the same length.
1
,CHEM 130 FINAL EXAM
3. Select the answer choice below that correctly ranks the following elements from
largest to smallest radius. Ti, Cr, K, Ge
a. Ti > Cr > Ge > K
b. Ge > Cr > Ti > K
c. K > Ti > Cr > Ge
d. K > Ti > Ge > Cr
e. Cr > K > Ge > Ti
4. The value of KP for the reaction below is 1.6 at 308 K.
NH4HS(s) ⇌ NH3(g) + H2S(g)
Initially, 0.50 mol of each of NH4HS, NH3, and H2S is added to a 2.0-L container.
How many moles of NH3 are present at equilibrium?
a. 0.10 mol NH3
b. 0.20 mol NH3
c. 1.3 mol NH3
d. 2.6 mol NH3
e. 5.1 mol NH3
2
, CHEM 130 FINAL EXAM
5. You are preparing 15.0 mL of a solution that is 3.10 M chloride ion. (Assume the
concentration of the cation is irrelevant for this experiment.) You have a
concentrated stock solution that is 5.00 M CaCl2. What volume (in mL) of water will
you add to prepare this 15.0-mL solution?
a. 4.65 mL
b. 5.70 mL
c. 9.3 mL
d. 10.4 mL
e. 15 mL
6. A 50-mL sample of 3.0 M hydrofluoric acid is titrated with sodium hydroxide.
How many moles of sodium hydroxide are consumed when the endpoint is reached?
a. 150 moles
b. 0.15 moles
c. 3.0 moles
d. 0.30 moles
e. 0.50 moles
7. Given the chemical reaction below, which of the reference values listed is NOT
needed in order to calculate the lattice energy for NaCl?
Cl2(g) + 2 Na(s) → 2 NaCl(s)
a. bond dissociation energy of Cl2
b. ionization energy of Na
c. electron affinity of Cl
d. energy of sublimation for Na
e. enthalpy of fusion for NaCl
3
