Chemistry Final Review
1. Write the formula unit for Barium
hydroxide.
ans: Ba(OH)2
2. Write the molecular formula for Trisulfur
hexaoxide
ans: S3O6
3. How many moles are in 2.3 g of NaCl
ans: 0.0396 moles
4. How many sig figs are in the answer in #3?
ans: 3
5. In the reaction of Na + S2  Na2S, write
the molar ratio for
Na/Na2S
ans: 4:2
Na/S2
ans: 4:1
6. Given 5 g of sodium, how many grams of
Na2S will be produced?
ans: 8.48 g Na2S
7. How many sif fig are expressed in #6 answer?
ans: 3
8. Concern the reaction between,
Cu + NaCl 
What type of reaction may be represented?
ans: single replacement
Does this reaction form a produce?
ans: No, Cu is less reactive than Na
Would Cu replace Ag in AgCl2
ans: yes, Ag is less reactive than Cu
9. Given 2Mg + PbCl4  Pb + 2MgCl2
Is this a good reaction?
ans: yes, Mg is more reactive than Pb
How many mole of PbCl4 is needed to form
5.5 moles of MgCl2 ?
ans: 11 moles MgCl2
How many grams of Mg is needed to produce
0.25 moles Pb?
ans: 12 g Mg
How many grams of MgCl2 is produced from
56.4 g PbCl4?
ans: 30.6 g MgCl2
10. How many moles are in 5.6 g of CuCl2?
ans: 0.045 moles CuCl2
11. How many molecules of O2 is needed to
burn 356 moles of CH4 ?
ans: 4.29 x 1026 molecules O2
12. Given 5.6 x 1021 molecules of Cu(NO3)2, how
many grams would you have?
ans: 1.75 g Cu(NO3)2
13.How moles are in 46 g C2H5OH?
ans: 1 mole C2H5OH
14.Given 12 ml of O2 in 2.5 L of water, which is
the solute?
ans: O2, of a lesser amount
15. A alloy is composed of 54% Cu and 46% Fe.
Which is the solvent?
ans: Cu, of a greater amount.
16.Oil will not mix in water. Oil is said to be:
ans: immiscible in water
17.Is CaCO3 soluble in water?
ans: insoluble
18.What is the molarity of 0.45 mole of HCl in
35 ml of water?
ans: 12.9 M HCl
19. How many grams of NaOH is needed to
make 250 ml of 2 M NaOH?
ans: 20 g NaOH
20.Given 54 g CaCl2 dissolved in 150 ml, what is
the molar concentration?
ans: 3.3 M
21. Is the [OH-] = 5.6 x 10-9 from a pH = 4.765
ans: no, pH = 5.75
22. What is the [H+] from [OH-] = 2.3 x 10-12
ans: 0.004 M
23. Is a solution with [OH-] = 8.3 x 10-2 an
acidic or basic solution?
ans: basic, pH = 12.9
24. What is the [H+] with a pH = 4.5
ans: [H+] = 3.16 x 10-5
25. What is the pOH when the pH = 8.9
ans: 14 – 8.9 = 5.1
26.Is a solution basic or acidic with a hydrogen
concentration of 1.2 x 10-10 ?
ans: basic, pH = 9.9
27. Given a 6M HCl, what is the [H+] ?
ans: HCl is strong, 100% dissociation
making the [H+] = 6 M
28. What is the [H+] from pOH = 12.5
ans: 0.0316
29. What is the pH of the solution in #28?
ans: pH = 1.5
30.Given the weak acid of HA with a
Ka = 1.6 x 10-5 :
a. How much of the HA remains at
equilibrium?
ans: 0.25 – 0.002 = 0.248
b. What is the pH of HA?
ans: pH = -log [H+] = 2.7
31. With an increase in the temperature, there
will be an ___________ in reaction rate.
ans: increase
32. A catalyst will increase reaction rate by:
ans: lowering the activation energy
33. A substance that slows reaction rate by
interfering with reaction pathways is called
ans: inhibitor
34.A reduction in the concentration of a
substance would tend to ___________
reaction rate?
ans: slow or reduce
35. What is the formula unit for Iron (III)
oxide?
ans: Fe2O3
36. True or false: a molecular compound is
composed of a metal bonded to a nonmetal?
ans: False, this defines an ionic compound
37.The sharing of electrons tends to form
what type of bond?
ans: covalent bond
38.Which of the following are diatomic
molecules: nitrogen, helium, argon
hydrogen
ans: N2 and H2 others are O2, F2, Cl2, Br2
and I2
39. How many atoms of chlorine are in Carbon
tetrachloride?
ans: 4
40. What is the name of AgF ?
ans: Silver (I) fluoride, MUST include Roman
numeral with transisitional metal naming.
41. Name Cr(ClO4)4
ans: Chromium (IV) perchlorate
42. With ionic compounds a Roman numeral is
used to identify the number of atoms
present. In a molecule _______ is used to
identify the number of atoms in a molecule.
ans: prefix
43. What is the prefix for 6
ans hexa44. The prefix penta- means?
ans: 5
45. Name the given compounds:
a. HBr
ans: hydrobromic acid
b. H2SO3
ans: sulfurous acid
c. HClO4
ans: perchloric acid
d. HF
ans: hydrofluoric acid
46. Write the formula for the following:
a. Calcium hydroxide
ans: Ca(OH)2
b. Hydrosulfuric acid
ans: H2S
c. Chlorous acid
ans: HClO2
d. Oxalic acid
ans: H2C2O4
47. Identify the type of reaction and complete:
a. CH4 + O2 
ans: combustion, CH4 + 2O2  CO2 + 2H2O
b. NaNO3 + Fe(SO4)2 
ans: Double replacement
4NaNO3 + Fe(SO4)2  2Na2SO4 + Fe(NO3)4
c. Pb + Ca(OH)2 
ans: Single Replacement, but a check of the
activity series indicate no reaction.
48. Would N2S5 tend to form ionic or covalent
bonds?
ans: Non-metal bonded to non-metal is
covalent.
49. The further apart two element are place on
the periodic table, the __________ ionic the
bond between then will be.
ans; more
50. What is the molar mass of potassium
dichromate?
ans: K2Cr2O7 has a mass of 294 g/mol
51. Food preservatives and weed killer are
examples of:
ans: an inhibitor
52. What affect would the increase in surface
area have on reaction rates?
ans: results in an increase
53. Energy based on position or composition is:
ans: potential energy
54. The change in the amount of energy in a
reaction is called:
ans: enthalpy of the reaction
55.What is the average reaction rate if at time
2s the concentration was 0.02 M and at
time 12 s the concentration is at 0.01 M
ans: -0.001 mole/L s
56. What does the (-) value indicate?
ans: reduction in the [reactants] in time
57. The energy of motion is called:
ans: kinetic energy
58. What concept is defined by mole solute/Kg
solvent?
ans: molality
59.Colligative properties are boiling point
elevation, vapor pressure lowering, osmotic
pressure and _______________.
ans: freezing point depression
60. A _______ is exhibited by the Tyndall Effect
ans: colloid
61. Which dissociation will result in a great
depression of the freezing point of water?
NaCl or MgCl2
ans: MgCl2 breaks into 3 particles
62.How much mass of water can absorb 4284 J
of heat when the temperature changes from
20 oC to 38.2oC?
ans: 56.3 g
63. How many joules of heat is exchanged when
156 g of a substance cools from 85.2oC to
5.6oC. The Cp = 0.554 J/goC
ans: -6879.4 J
64. What does the negative value in #63 mean?
ans: energy is loss by the substance to the
surrounding.
65.In the synthesis reaction of sodium in the
present of molecular oxygen, what is the
product?
ans: Na2O
66. Will a precipitate form in the following
reaction: Ca(NO3)2 + K2SO3 
ans: Yes, CaSO3