chem 111
The final exam in Chem 111 will be based on the following topics taught in Chem 111. On the real final exam the
number of problems will vary. For the department final exam students will be provided a copy of the periodic table but
must know the polyatomic ions and the metric table.
Topic Sample
Significant figures 1. How many significant figures in 0.00210800 m?
Add and subtraction of
measurements
2. What is 97.2 grams + 4.63 grams?
3. What is 15.50 m – 6.5 m?
Multiplying and dividing
measurements
4. What is the volume of a box that measures 12.43 cm long by 9.07 cm wide by
5.40 cm high?
Scientific notation 5. Write 5680 mg in scientific notation.
6. Write 7.5 x 10-4 kg in standard form.
Metric/metric
conversions
7. Convert 52.5 cm to μm.
8. Convert 640 cL to kL
9. Convert 8.11 nanograms to picograms.
Metric/English
conversions
10. Convert 24.7 ounces (oz) to kilograms.
11. Convert 1.50 km to inches.
Writing formulas of
compounds given names
12. Write the formulas for the compounds named below:
a) calcium nitrate
b) chromium (III) sulfate
c) bromine trifluoride
Naming compounds
given the formula
13. Name the following compounds.
a) SnF4
b) Al2S3
c) PCl5
Isotopes 14. The isotope gallium – 71 has an atomic number of 31.
a. How many neutrons in gallium – 71?
a. How many protons in gallium – 72?
Calculation of density
and density as a
conversion factor
15. What is the density of a liquid if 20.0 mL of the liquid has a mass of 17.53 grams?
16. Liquid nitrogen has a density of 1.25 g/mL. How grams of liquid nitrogen would
have a volume of 91.8 mL?
17. How many mL of 3% hydrogen peroxide would have a mass of 200.0 grams if the
density of 3% hydrogen peroxide is 1.02 g/mL?
Calculating atomic
weight given isotope
percent abundances and
masses.
18. Magnesium has three naturally occurring isotopes with the masses and percent
occurrences shown below. Calculate the average atomic mass of
Magnesium– 24. 23.985 amu 78.70%
Magnesium – 25 24.986 amu 10.13%
Magnesium – 26 25.983 amu 11.17%
Naming acid and writing
formulas of acids
19. Name the following acids.
a. HNO3 (aq)
b. H2SO3 (aq)
c. HBr (aq)
Predict solubility using a
solubility table
20. Would the following be soluble or insoluble if they were mixed with water? What
phase symbol (s, l, g, aq) would be used to indicate their phase if mixed with
water?
a. AgCl
b. Na3PO4
c. Pb(NO3)2
d. BaCl2
Writing double
displacement equations
with phases given only
the reactants.
21. Aqueous iron (III) acetate reacts with potassium hydroxide in a double
displacement reaction to produce a precipitate. Write a balanced molecular
equation for this reaction. Include phases such as (aq), (s), (l) or (g).
22. Aqueous barium chloride reacts with aqueous potassium sulfate to produce a
white precipitate. Write a balanced molecular equation for this reaction. Include
phases.
Writing balanced
combustion equations
given a hydrocarbon
only.
23. Pentane, C5H12, burns via a combustion reaction. Write the balanced equation
including reactants and products.
24. Butane, C4H10, is used in cigarette lighters. Write the balanced equation including
reactants and products.
Write balanced equation
given word description of
the reactants and
products
25. Write a balanced equation for the reaction of aqueous aluminum nitrate with
aqueous sodium carbonate to form a precipitate of aluminum carbonate and
aqueous sodium nitrate.
26. Solid magnesium carbonate reacts with hydrochloric acid to produce carbon
dioxide gas, water and aqueous magnesium chloride. Write a balanced equation
with phases.
Writing net ionic
equations from
molecular equations
27. Write the net ionic equation for the following molecular equation.
3K2CO3 (aq) + 2Al(NO3)3 (aq) Al2(CO3)3 (s) + 6KNO3 (aq)
Percent composition 28. What is the percent of calcium in calcium phosphate?
Calculating empirical
formulas
29. A compound contains only carbon, hydrogen and oxygen. What is the empirical
formula if compound is 40.00% carbon, 6.71% hydrogen and 53.28% oxygen?
30. What is the empirical formula of a compound that contain 74.39% gallium and
the rest is oxygen?
Using Avogadro’s
number
31. How many moles of aluminum would contain a billion trillion (1021) atoms?
32. Calculate the number of aluminum atoms in 100.0 grams of aluminum.
33. Calculate the number of sodium atoms in 5.67 moles of sodium carbonate.
Find molar mass given a
formula
34. Find the molar mass of zinc chloride, ZnCl2.
35. What is the molar mass of aluminum nitrate, Al(NO3)3?
Converting between
grams and moles
36. How many grams would 0.249 moles of zinc chloride, ZnCl2, weigh?
37. How many moles are in 120.0 grams of zinc chloride?
Stoichiometry problems
with mass and moles
38. For the reaction shown below, how many grams of nitrogen reacted if 1.84 moles
of hydrogen reacted?
N2 (g) + 3H2 (g) 2NH3 (g)
39. For the reaction shown below, how many grams of ammonia were produced if
17.95 grams of hydrogen reacted? (16 pts)
N2 (g) + 3H2 (g) 2NH3 (g)
Limiting and Excess
Reactants
40. For the reaction N2 (g) + 3H2 (g) 2NH3 (g)
a. Identify the limiting reactant AND the theoretical yield of the product
indicated. 35.0 grams of hydrogen reacts with 125.0 grams of nitrogen.
How much ammonia could be produced? (Answer: nitrogen is the
limiting reactant, 152 grams of ammonia could theoretically be
produced.)
b. How many grams of excess reactant reacted? How many grams of excess
reactant were left over? (Ans: 26.98 g H2 reacted, 8.0 g H2 left)
Boyles law
Charles law
Combined gas law
41. A cylinder with a movable piston has a volume of 28.9 mL and a pressure of 0.584
atm. What is the new pressure if the volume is decreased to 21.7 mL? Assume
the temperature does not change.
42. A balloon has a volume of 25.0 L when the temperature is -10.0 oC. What will the
volume be when the temperature increases to 40.0 oC? Assume the pressure is
constant.
43. A weather balloon has a volume of 1250 liters of helium when the pressure is
1.00 atm and the temperature is 15.0 oC. What will the volume of the balloon be
if it floats to an altitude where the temperature is -15.0 oC and the pressure is
0.400 atm?
STP conditions 44. What is the volume of 2.50 moles of chlorine gas at 0 oC and 1 atm?
Ideal gas law 45. How many moles of neon are contained in a volume of 500.0 mL, a pressure of
800.0 mm Hg and a temperature of 37.0 oC?
Partial pressures 46. Oxygen gas is collected over water where the barometric pressure is 29.00 in Hg
and the temperature is 24.6 oC. What is the partial pressure of the oxygen gas?
(You will be given a vapor pressure table like the one used in lab)
Gas stoichiometry at STP
conditions
47. How many liters of carbon dioxide at STP would be produced when 75.0 grams of
Na2CO3 reacts with excess hydrochloric acid? (answer: 15.9 L)
Na2CO3 (s) + 2HCl (aq) 2NaCl (aq) + H2O (l) + CO2 (g)
Calculate molarity 48. What is the molarity of a solution that contains 15.7 grams of NaOH in 250.0 mL
of solution?
Calculations with
molarity
49. How many grams of sodium hydroxide, NaOH, would be required to make 367.0
mL of a 1.95 M solution?
50. How many mL of a 0.437 M solution of sodium hydroxide, NaOH, would contain
9.87 grams of sodium hydroxide?
Dilutions 51. A 0.761 M solution of hydrochloric acid has a volume of 50.00 mL. What will the
new molarity of the solution be if 25.00 mL of water is added to the original
solution?
Strong and weak acids 52. Which of the following is a not a strong acid?
a. HNO3 (aq) b. HClO4 c. HC2H3O2
53. Write the balanced equation for the disassociation of
a. sulfuric acid
b. sulfurous acid
Writing acid / base
reactions
54. Write a balanced equation for the reaction of nitric acid with calcium hydroxide.
Neutralization
stoichiometry
55. How many mL of a 0.850 M HNO3 would it take to neutralize 10.00 grams of
Ca(OH)2?
Use a calculator to
evaluate mathematical
expression with scientific
notation
56. Solve the following: �5.87 ×103 � ×(6.61×10−2)
�3.29 ×10−3� ×(7.51 × 104
Distinguish among
elements, compounds
(both ionic and covalent),
and mixtures
57. Tell whether the following are elements, compounds or homogeneous mixtures
or heterogeneous mixtures.
a. Iron (II) cyanide b. fresh orange juice c. silicon d. vanilla ice cream
Predict chemical and
physical properties using
the periodic table
58. Based on its location of the periodic table would you expect calcium to have
chemical and physical properties most similar to strontium, potassium or iron?
Use symbols, names,
periods, groups, atomic
weights
59. What main block element is found in period 3 and has a 3+ charge when it is an
ion?
Identify oxidation
numbers
60. Identify the oxidation numbers of nitrogen in the following:
a. NO2 b. N2 c. NH3 d. NO3
- e. Na3N
Write electron
configurations
61. For the element barium do the following:
a. Write the electron configuration
b. Write the noble gas electron configuration