FINAL EXAM
1) What is the coefficient of Cd metal after balancing the following equation?
__Al(s) + __Cd(C2H3O2)2(aq) → __Al(C2H3O2)3(aq) + __Cd(s)
A) 1
B) 2
C) 3
D) 4
E) none of the above
2) What is the number of sulfur atoms that equal a mass of 32.07 amu?
A) 1
B) 16
C) 32
D) 6.02 × 1023
E) none of the above
3) What is the coefficient of oxygen gas after balancing the following equation?
__P(s) + __O2(g) → __P2O3(s)
A) 0
B) 1
C) 3
D) 5
E) none of the above
4) What is the term for the chemical formula of a compound that expresses the actual number of atoms of each element in a molecule?
A) atomic formula
B) elemental formula
C) empirical formula
D) molecular formula
E) none of the above
5) Predict the chemical formula for sodium sulfide, given the formula of lithium oxide, Li2O.
A) NaS
B) Na2S
C) NaS2
D) Na2S3
E) none of the above
6) What is the mass of 3.30 × 1023 atoms of silver, Ag?
A) 0.549 g
B) 25.8 g
C) 59.1 g
D) 85.7 g
E) 197 g
7) The formula for mustard gas used in chemical warfare is C4H8SCl2. What is the percentage of hydrogen in the compound?
A) 0.635%
B) 5.08%
C) 20.16%
D) 30.20%
E) 44.57%
8) What is the chemical formula for stannic chlorite?
A) Sn(ClO2)2
B) Sn(ClO2)4
C) Sn(ClO3)2
D) Sn(ClO3)4
E) none of the above
9) If 0.300 mol of lead combines with 0.300 mol of sulfur, what is the empirical formula of the lead sulfide product?
A) PbS
B) Pb2S
C) PbS2
D) Pb3S3
10) State whether each of the following is a physical or a chemical change:
A) oxidation
B) sublimation
C) vaporization
D) condensation
E) combustion
11) What do you understand by a Neutralization Reaction?
12) What is the term for the value that indicates the number of protons for an atom of a given element?
A) atomic notation
B) atomic number
C) atomic mass
D) mass number
E) none of the above
13) If a rectangular stainless steel block measures 5.05 cm by 1.50 cm by 1.25 cm, what is the volume of the stainless steel solid?
A) 0.106 cm3
B) 2.69 cm3
C) 4.21 cm3
D) 6.06 cm3
E) 9.47 cm3
14) Starting with 0.657 g of lead(II) nitrate, a student collects 0.925 g of precipitate. If the calculated mass of precipitate is 0.914 g, what is the percent yield?
A) 71.0%
B) 71.9%
C) 98.8%
D) 101%
E) 139%
15) According to Rutherford, which of the following subatomic particles are found outside the nucleus?
A) electron and neutron
B) neutron and proton
C) proton and electron
D) all of the above
E) none of the above
16) A 109.35 g sample of brass is added to a 100-mL graduated cylinder with 55.5 mL of water. If the resulting water level is 68.0 mL, what is the volume of the brass?
A) 12.5 mL
B) 32.0 mL
C) 44.5 mL
D) 87.5 mL
E) 123.5 mL
17)What is the [H+] in orange juice with a pH of 2.75?
18) One milliliter of helium gas contains 26,900,000,000,000,000,000 atoms at normal temperature and pressure. Express this number of atoms in scientific notation.
A) 2.69 × 1017
B) 2.69 × 1018
C) 2.69 × 1019
D) 26.9 × 1018
E) 26.9 × 1019
19) Acetylene is used in oxyacetylene gas welding. Calculate the empirical formula for acetylene given its percent composition: 92.25% C and 7.75% H.
A) CH
B) CH2
C) CH8
D) C8H8
E) C12H
20)Write the unit equation for each of the following metric equivalents:
A)L and pL
B)s and Gs
C)g and Mg
D)m and mm
21) What volume of 6.0 M NaOH needs to be diluted to prepare 5.00 L of 0.10 M NaOH?
22) Which of the following is the electron dot formula for an atom of strontium?
A)
B)
C)
D)
E)
23)What is the pH of blood with [H+] = 4.8 x 10–8 M?
24) Considering the limiting reactant, what is the mass of zinc sulfide (97.46 g/mol) produced from 0.750 g of zinc and 0.350 g of sulfur?
Zn(
s) + S(
s) ZnS(
s)
A) 0.530 g
B) 1.06 g
C) 1.10 g
D) 1.12 g
E) 2.28 g
25) Give electron dot formula for Sulphur Trioxide. Define Octet rule, core electrons and valence electrons.
1
¾
®
¾
D
Chem
110
1
Name_________________
F
INA
L
EXAM
1
) What is the coefficient of Cd metal after balancing the following equation?
__Al(
s
) + __Cd(C
2
H
3
O
2
)
2
(
aq
)
?
__Al(C
2
H
3
O
2
)
3
(
aq
) + __Cd(
s
)
A) 1
B) 2
C) 3
D) 4
E) none of the above
2
) What is the number of sulfur atoms that equal a mass of 32.07
amu?
A) 1
B) 16
C) 32
D) 6.02 × 10
23
E) none of the above
3
) What is the coefficient of oxygen gas after balancing the following equation?
__P(
s
) + __O
2
(
g
)
?
__P
2
O
3
(
s
)
A) 0
B) 1
C) 3
D) 5
E) none of the above
4
) What is
the term for the chemical formula of a compound that expresses the actual number of
atoms of each element in a molecule?
A) atomic formula
B) elemental formula
C) empirical formula
D) molecular formula
E) none of the above
5
) Predict the chemical formul
a for sodium sulfide, given the formula of lithium oxide, Li
2
O.
A) NaS
B) Na
2
S
C) NaS
2
D) Na
2
S
3
E) none of the above
Chem 110
1
Name_________________
FINAL EXAM
1) What is the coefficient of Cd metal after balancing the following equation?
__Al(s) + __Cd(C
2
H
3
O
2
)
2
(aq) ? __Al(C
2
H
3
O
2
)
3
(aq) + __Cd(s)
A) 1
B) 2
C) 3
D) 4
E) none of the above
2) What is the number of sulfur atoms that equal a mass of 32.07 amu?
A) 1
B) 16
C) 32
D) 6.02 × 10
23
E) none of the above
3) What is the coefficient of oxygen gas after balancing the following equation?
__P(s) + __O
2
(g) ? __P
2
O
3
(s)
A) 0
B) 1
C) 3
D) 5
E) none of the above
4) What is the term for the chemical formula of a compound that expresses the actual number of
atoms of each element in a molecule?
A) atomic formula
B) elemental formula
C) empirical formula
D) molecular formula
E) none of the above
5) Predict the chemical formula for sodium sulfide, given the formula of lithium oxide, Li
2
O.
A) NaS
B) Na
2
S
C) NaS
2
D) Na
2
S
3
E) none of the above