The midterm test for 1998 is on Oct. 29 between 7:00 and 8:30 pm.
If you have a class or another examination scheduled during this time,
or check the
Sample MidTerm Test
The Mid Term Tests are set by your instructor, and his style and
problems may be very different from these sample problems.
Mid Term Test Example Problems
The answers are given at the end of the Instruction, and there are
a few more practice questions in the Dialogue.
A compound consists of 68.1 % C, 13.7 % H and 18.2 % O.
What is its empirical formula?
Antimony(III) oxide is produced by burning antimony metal in air,
4 Sb(s) + 3 O2(g) -> 2 Sb2O3(s)
How much antimony is needed to prepare 425 kg of Sb2O3 if the yield
is 94.0 %?
A 292 kg
B 259 kg
C 710 kg
D 355 kg
E 378 kg
What is the molar concentration of K2CrO4 in a solution which
contains 22.0 % K2CrO4 by weight, and has a density of 1.192 g/mL?
A 1.13 M
B 1.35 M
C 0.0950 M
D 1.19 M
E 0.220 M
Which statement is not correct?
Oxygen gas (M=32.0) will effuse through a tiny pinhole 1.4142
times as fast as sulfur dioxide (M=64.0) at the same temperature
and pressure, in the same apparatus.
At a given temperature, H2 gas molecules have a higher average
speed than N2 gas molecules (M=28.0).
The density of H2 (g) is greater than the density of N2(g)
at the same temperature and pressure.
The boiling point of a liquid is the temperature at which
the liquid's equilibrium vapour pressure equals the surrounding
Given 2 NO(g) + O2 (g) -> 2 NO2 (g), the reaction of 1.0 L
of NO (g) with 1.0 L of O2 (g) would give a gas mixture with
final volume of 1.5 L, after the limiting reagent has been
consumed -- all measurements at the same temperature and
A mixture of N2 (g) and O2 (g) occupies a volume of 335 mL at
538 torr and 24 °C. If the partial pressure of O2 (g) is 246 torr,
what amount of N2(g) is present?
A 0.00445 mol N2 (g)
B 0.00973 mol N2 (g)
C 0.00528 mol N2 (g)
D 0.0654 mol N2 (g)
E 0.120 mol N2 (g)
Using standard heat of formation data from the data sheet,
determine the standard heat of combustion for 1.00 mole of
C2H5OH(l) with excess O2.
(Data sheet is not given here, but you may consult a text
Given the enthalpies for the reactions (all reactants and products are gases)
HF => H + F, DH = 568 kJ
H2 => 2 H, DH = 463 kJ
H2 + F2 => 2 HF, DH = -542 kJ
What is the DH for the reaction
F2 => 2 F
A 262 kJ
B 131 kJ
C -131 kJ
D -262 kJ
E Non of the above
A gas at 25 °C is contained in a closed cylinder with a moveable
piston. Its volume is 5.00 L and its pressure is the same as
the atmospheric pressure of 96.3 kPa. The gas is heated to
50 °C, by adding 101 J of heat, while it expands against the
atmospheric pressure to a new volume of 5.50 L.
What is change in inter energy E for the gas?
A 101 J
B 149 J
C 53 J
D -101 J
E 202 J
Which of the following statements about the Hall-Heroux process
for the electrolytic production of aluminum is or are correct?
The mixture of cryolite and alumina has a much lower melting
point than either pure cryolite or pure alumina.
During electrolysis the carbon anode is consumed and CO2 is formed.
The molten aluminum that forms is drawn off from the bottom of
C a and b
D b and c
E a, b and c
A 2.00 g mixture of CaCl2 and NaCl is dissolved in water.
Then, AgNO3 was added, and the resulting dry AgCl weighs a g.
If the 2.0 g mixture contains x g CaCl2, and y g NaCl,
which one of the following statements is correct?
A x + y = a
B x = 2 + y
C x / (molar mass of CaCl2) + y / (molar mass of NaCl) = a
D 2 x / (molar mass of CaCl2) = moles of Cl- from CaCl2
E a / (molar mass of AgCl) = number of mole of NaCl
Two more versions are available:
Version 1 has 7 questions, and
Version 2 has 10 questions.
Confidence Building Questions
This is not an easy question!