CHEM 105 EXAM 2 QUESTIONS AND
ANSWERS
Which of the following compounds contain covalent bonds?
CaCl2, Br2, K2O, CrSO4, NO2 - Correct Answers -Br2, CrSO4, and NO2
What is the correct formula for the neutral molecule containing sodium & sulfite ions? -
Correct Answers -Na2SO3
What is the correct name for Ti(BrO2)2? - Correct Answers -Titanium (II) Bromite
What is the correct name for CS2? - Correct Answers -carbon disulfide
A molecule contains 69.19% C, 10.33% H, and 20.48% O by mass. What is the
molecules empirical formula? - Correct Answers -C9H16O2
Which compound is a non-electrolyte when dissolved in water? - Correct Answers -
C2H6O
What is the concentration (in molarity, M) for a solution made from 49.8 g of FeCl3 and
water with a total volume of 100mL? Identify the solute of the solution. - Correct
Answers -3.07 M
FeCl3 is the solute
What volume of 0.80 M AgNO3 is required to fully react with 25.0 L of 0.30 M MgCl2?
2 AgNO3 (aq) + MgCl2 (aq) --> 2 AgCl (s) + Mg(NO3)2 (aq) - Correct Answers -18.75 L
What is the oxidation number of chlorine in KClO2? - Correct Answers -3
According to kinetic molecular theory, which gas will have the highest average velocity
at a given temperature?
N2, O2, CO2, Ar, Ne - Correct Answers -Ne
What is the density of CO2 (g) at standard temperature and pressure (STP)? - Correct
Answers -1.96 g/L
If it takes 58.0 seconds for a small amount of nitrogen gas to effuse, how long would it
take for the same small amount of CO2 (g) to effuse under the same conditions? -
Correct Answers -72.7 seconds
ANSWERS
Which of the following compounds contain covalent bonds?
CaCl2, Br2, K2O, CrSO4, NO2 - Correct Answers -Br2, CrSO4, and NO2
What is the correct formula for the neutral molecule containing sodium & sulfite ions? -
Correct Answers -Na2SO3
What is the correct name for Ti(BrO2)2? - Correct Answers -Titanium (II) Bromite
What is the correct name for CS2? - Correct Answers -carbon disulfide
A molecule contains 69.19% C, 10.33% H, and 20.48% O by mass. What is the
molecules empirical formula? - Correct Answers -C9H16O2
Which compound is a non-electrolyte when dissolved in water? - Correct Answers -
C2H6O
What is the concentration (in molarity, M) for a solution made from 49.8 g of FeCl3 and
water with a total volume of 100mL? Identify the solute of the solution. - Correct
Answers -3.07 M
FeCl3 is the solute
What volume of 0.80 M AgNO3 is required to fully react with 25.0 L of 0.30 M MgCl2?
2 AgNO3 (aq) + MgCl2 (aq) --> 2 AgCl (s) + Mg(NO3)2 (aq) - Correct Answers -18.75 L
What is the oxidation number of chlorine in KClO2? - Correct Answers -3
According to kinetic molecular theory, which gas will have the highest average velocity
at a given temperature?
N2, O2, CO2, Ar, Ne - Correct Answers -Ne
What is the density of CO2 (g) at standard temperature and pressure (STP)? - Correct
Answers -1.96 g/L
If it takes 58.0 seconds for a small amount of nitrogen gas to effuse, how long would it
take for the same small amount of CO2 (g) to effuse under the same conditions? -
Correct Answers -72.7 seconds
