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Question 1
Practice for final
Which of the following is a chemical change?
Work in teams of 2 or 3
Agree on one answer
Fi st team
First
t m that
th t each
h holds
h lds up
p correctt answers
ns
s
gets 1 star
Team with most stars wins!
a. Aluminum can crushed by air pressure
b. Melting of ice
c Heat from a stove flows through an aluminum pan to
c.
the water inside
d. The silver spoon used to eat eggs turns black
Correct answer is d
Question 2
Question 1a
How much energy is available if 0.00145 mol of
photons are emitted at 295 nm?
h = 6.626 x 10-34 Jxs
a. 5.88 x 102 J
b. 4.05 x 105 J
c. 1.02 x 1015 J
d. 6.74 x 10-19 J
Correct answer is a
Which of the following is (are) elements?
i) CO
ii) Co
iii) C
iv) Cl2
a.
b
b.
c.
d.
e.
v) CaCl2
only iii
iii and iv
i and v
ii, iii and iv
ii and iii
Correct answer is d
Question 3
Question 4
The correct formula of potassium sulfate is
The correct formula of ammonium carbonate is
a. K2SO3
b. K2S
c KHSO4
c.
d. K(SO4)2
e. K2SO4
a. N2CO3
b. (NH4)2CO3
c NH4CO3
c.
d. (NH3)2CO3
e. (NH4)4C
Correct answer is e
Correct answer is b
1
Question 5
Question 6
What’s the empirical formula of a compound consisting of
45.27% carbon,
9.50% hydrogen, and
45.23% oxygen by mass? (Assume 100g of compound).
Which is the best pair of solvents for decanoic acid,
CH3(CH2)8CO2H
a.
b.
c.
d.
C9H18O9
C4H9O3
C45H9O45
C4H10O3
a. kerosene
b kerosene
b.
c. ethanol
d. ethanol
e. water
Correct answer is d
or
or
or
or
or
aqueous NaOH
aqueous HCl
water
aqueous NaCl
aqueous NaOH
Correct answer is a
Question 7
Question 8
Name the binary compounds PCl5 and S2Cl2.
Write the name for Mg(NO3)2 and the formula of
cobalt (II) chloride hexahydrate.
Are they molecular or ionic?
a. Phosphorus pentachloride
b. Phosphorus chloride
c Phosphorus (V) chloride
c.
d. Phosphorus pentachloride
and
and
and
and
disulfur dichloride.
disulfur dichloride.
disulfur dichloride
dichloride.
sulfur (II) chloride.
a. Magnesium (II) Nitrite
a
Nitrite,
b. Magnesium (II) Nitrate,
c. Magnesium Nitrate,
d. Magnesium Nitrate,
Correct answer is a
CoCl2*6H
6H2O.
O
CoCl2*6H2O.
CoCl2*6H2O.
CoCl2*6H2O.
Ionic
Ionic.
Molecular.
Ionic.
Molecular.
Correct answer is c
Question 9
Question 10
The element Rhenium, Re, has two stable isotopes and 18
unstable isotopes. Re-185 has in its nucleus:
What mass of CO2 (MM 44.01 g/mol) is formed in the
reaction of 233 g of Fe2O3 (MM 159.7 g/mol)
with 41.2 g C(s), given the following equation:
a. 75 protons, 75 neutrons
b. 75 protons
b
protons, 111 neutrons
c. 130 protons, 75 neutrons
d. 75 protons, 110 neutrons
e. 185 protons, 185 neutrons
Correct answer is d
a.
b.
c.
d.
3 C(s)
64.2 g
48.1 g
96.3 g
2.19 g
+ 2 Fe2O3(s)  4 Fe(s)
+ 3 CO2(g)
Correct answer is c
2
Question 11
Question 12
When 1.50 mol of oxygen gas is mixed with 48.7 g of zinc
sulfide, the products are solid zinc oxide and sulfur
dioxide gas. How many moles of zinc oxide could form
in this reaction.
Which aqueous solution will have the highest number of
dissolved particles?
a.
b.
c.
d.
0.50 mol
1.5 mol
2.0 mol
1.0 mol
a.
b
b.
c.
d.
Correct answer is a
Correct answer is b
Question 13
Question 14
Balance the following equation.
What is the coefficient in front of H2O?
P4O10
a.
b.
c.
d.
+
H2O

H3PO4
3
5
6
8
If 3 moles of calcium hydroxide are reacted with excess
HCl, how many moles of H2O will be produced?
a.
b.
b
c.
d.
Correct answer is c
Question 15
For a complete reaction of
Mg (s) + Ge (s)  MgGe (s),
(balanced)
about what mass ratio of the elements should be used?
a.
b.
c.
d.
e.
1.00 mol of NaCl in 1.0 L
3
3.00
00 mol of CaCl2 in 1.0
10L
3.00 mol of methanol in 1.0 L
1.50 mol of NaCl in 0.5 L
the masses of Mg and Ge will be equal
g will be ½ the mass of Ge
the mass of Mg
the mass of Ge will be ½ the mass of Ge
the mass of Mg will be three times the mass of Ge
the mass of Ge will be three times the mass of Mg
Correct answer is e
6 mol
2 mol
5 mol
3 mol
Correct answer is a
Question 16
How much energy does a refrigerator have to remove
from 1.50 kg of water at 20.0 C to cool the water to
2.00 C? Specific heat of water = 4.18 J/g C.
a.
a
b.
c.
d.
e.
126 J
113 J
113,000 J
126,000 J
none of the above
Correct answer is c
3
Question 17
Question 18
In the lab, a student filled a 250.0 mL container with an
unknown gas until a pressure of 760.0 Torr was
obtained when the temperature was 25 ºC. He then
found that the sample of gas weighed 0.164 g. What
is the molar mass of the gas?
Calculate the H for the synthesis of propane
3 C (s) + 4 H2 (g)  C3H8 (g)
a.
b.
c.
d.
e.
1.34 g/mol
16.0 g/mol
62.3 g/mol
0.0211 g/mol
1.77×10-3 g/mol
C3H8(g) + 5O2(g)  3CO2(g) + 4H2O(l) H = -2220 kJ
C (s) + O2 (g)  CO2 (g)
H = -394 kJ
H = -286 kJ
H2 (g) + ½ O2 (g)  H2O ((l))
a - 106 kJ
Correct answer is b
b. 106 kJ
c. 1540 kJ
d. -212 kJ .
Correct answer is a
Question 19
Question 20
Which pair [or pairs] of solutions will give a precipitate
when mixed?
What is the pH of a 0.00873 M solution of Ba(OH)2?
a.
b
b.
c.
d.
AgNO3(aq)
Na2CO3(aq)
Fe(NO3)2(aq)
NaOH(aq)
and NaC2H3O2(aq)
and Ca(ClO4)2(aq)
and NaCl(aq)
and CuCl2(aq)
a.
b.
c
c.
d.
Correct answers are b and d
2.06
1.75
12 25
12.25
11.94
Correct answer is c
Question 21
Question 22
What is the formula for copper (II) chloride tetrahydrate?
How many mL of a 3.59 M solution are needed to
make 250.0 mL of a 0.925 M solution?
a.
b.
c
c.
d.
a.
Co2Cl•H2O
CoCl2•4H2O
CuCl2•4H2O
Cu2Cl4•H2O
b. 64.4 mL
c.
Answer is c
13.3 mL
970 mL
d. 15.5 mL
Answer is b
4
Question 23
Question 24
A 3.00 g sample of copper (II) sulfate pentahydrate
(FW of CuSO4 is 159.7 g/mol) is heated until it turns
white. What is the mass of the final solid product?
A 25.00 mL sample of sulfuric acid is titrated with 23.59
mL of 0.4159 M NaOH. What is the concentration of
the acid?
a.
a
b.
c.
d.
a.
a
b.
c.
d.
1 92 g
1.92
4.69 g
2.78 g
3.23 g
Answer is
a
0 3924 M
0.3924
0.7848 M
0.004906 M
0.1962 M
Answer is d
• End of review:
• 2 more slides of practice,
• Or use for tiebreaker
Name these molecular shapes
Name these molecular shapes
5