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King Abdul Aziz University
Faculty of science
Chemistry department
Model (C)
Chem.110
Final exam of 1st term 1432-1433H
Time: 120minutes
Student name:
Student number
Section
Useful information
Speed of light,
c = 3.0×108 m/s
Planck’s const.,
h = 6.63×10-34 J.s
Avogadro’s No.,
NA = 6.022×1023 mol-1
Rydberg const. for H atom,
RH = 2.18×10-18 J
Gas constant,
R= 0.082 L atm K-1 mol-1
With the best wishes
General Chemistry Team work
1 C
Directions: For each of the following questions, choose the letter that best answers the
question and place it on your answer sheet.
1.The diameter of a circuit is 11 X 103 cm. What is this diameter when expressed in
micrometers?
a)
b)
c)
d)
11 X 105µm
11 X 107µm
11 X 103µm
11 X 109µm
2. How many milliliters in 1.4161 L?
a)
b)
c)
d)
14161.0 mL
1416.1 mL
14.16 mL
141.61 mL
3. Bromine is a red liquid at 25° C. Its density is 3.12 g/cm3. What is the volume of 42.5 g of
liquid bromine?
a)
b)
c)
d)
17.62 cm3
11.62 cm3
16.62 cm3
13.62 cm3
4.Which of the following is a SI base unit?
a)
b)
c)
d)
candela
hour
yard
all of the above
5.Which of the following element is in the halogen group?
a)
b)
c)
d)
N
Li
Mg
Br
6.Which pair of Atomics would be most likely to form a molecular compound?
a)
b)
c)
d)
Li and N
K and Cl
Li and K
C and O
2 C
7. Give the number of protons (p), electrons (e), and neutrons (n) in fluoride ion, 919F - .
a)
b)
c)
d)
9 p, 10 n, 10 e
10 p, 10 n, 9 e
10 p, 9 n, 10 e
9 p, 10 n, 8 e
8. What is the mass of 0.46 mol nickel (Ni) metal?
a)
b)
c)
d)
26.64 g
28.14 g
27.00 g
28.64 g
9. How many grams of Cl2 can be prepared from the reaction of 15.2 g of MnO2 and excess of
HCl according to the chemical equation: MnO2 + 4HCl → MnCl2 + Cl2 + 2H2O
a) 11.4 g
b) 12.4 g
c) 15.4 g
d) 10.4 g
10. Calculate the molarity of a solution of 6 g of ethanol (C2H5OH) in 546 mL of solution.
a)
b)
c)
d)
3.24 M
1.3 M
1.24 M
0.24 M
11. How many bonds around phosphorous atom in, NF3?
a)
b)
c)
d)
1
4
3
5
12. The formal charge on Boron atom in, CH4?
a)
b)
c)
d)
+2
+4
+5
0
3 C
13.The type of bond in Cl2 Compound can be classified as
a)
b)
c)
d)
Polar covalent bond
Ionic bond
Hydrogen bond
Nonpolar covalent bond
14. How many total valence electrons are present in, H2CO3?
a)
b)
c)
d)
15
20
4
24
15. The electron configuration 1s22s22p63s23p6 applies to all of the following species except:
a)
b)
c)
d)
Ca2+
K+
Na+
Ar
16. The correctly drawn Lewis formula for CCl4 will have __________.
a)
b)
c)
d)
4 single bonds and 12 nonbonding electrons
4 single bonds and 20 nonbonding electrons
4 single bonds and 18 nonbonding electrons
4 single bonds and 24 nonbonding electrons
17. Which one of the following molecules would exhibit resonance?
a) O3
b) H2S
c) Cl2
d) CH4
18. Which of these molecules has an expanded of the octet rule?
a)
b)
c)
d)
NF3
PCl5
Br2
CO
4 C
19. If the initial pressure of a 2.00 L gas sample is 2.50 atm, what will the pressure be if the
volume is changed to 3.00 L at constant temperature?
a)
b)
c)
d)
0.600 atm
1.50 atm
1.67 atm
3.75 atm
20 .Propane burns in air according to the equation:
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g) What volume of CO2 would be formed if 8.00 L of
propane burns, assuming that all of the gases are under the same conditions?
a)
b)
c)
d)
12.0 L
24.0 L
3.00 L
4.80 L
21. Select the correct equilibrium constant expression for the reaction:
CH4(g) + 2H2S(g) a)
b)
c)
d)
CS2(g) + 4H2(g)
Keq = [CS2][H2]4 / [CH4][H2S]2
Keq = [CH4][H2S]2/ [CS2][H2]4
Keq = [CH4][ H2S] / [CS2][H2]
Keq = [CS2][H2] / [CH4][H2S]
22. Select the solution below that is the most acidic.
a)
b)
c)
d)
[H3O+] = 1.0 × 10–10 M
[H+] = 1.0 × 10–3 M
[H+] = 1.0 × 10–8 M
[H+] = 1.0 × 10–4 M
23. Consider the following system at equilibrium:
CH4 (g) + 2H2O (g) ↔ CO2(g) + 4H2(g)
What change will cause the equilibrium to shift to form more CH4?
a)
b)
c)
d)
add a catalyst
decrease [H2O]
increase the volume of the reaction vessel
decrease [H2]
5 C
24. Consider the following system at equilibrium:
C2H2(g) + H2(g)
C2H6(g)
Exothermic
What change will be observed if the temperature of the reaction mixture at equilibrium were
increased?
a)
b)
c)
d)
The concentration of C2H6 will increase.
The concentration of both C2H2 and H2 will increase.
There will be no change in the equilibrium concentrations.
The concentration of both C2H2 and H2 will decrease.
25. Calculate the pH of a solution that has [H3O+] = 1.0 × 10–7M.
a)
b)
c)
d)
pH = 1.00
pH = 14.00
pH = 7.00
pH = 6.00
26. If the pH of a solution is 11, the solution will be:
a)
b)
c)
d)
Acidic
Neutral
Alkaline
None of these
27. Fill in the blanks: 6.00 moles of oxygen gas (O2) have a weight of ---------- g , and occupy
volume of ---------- L at STP.
a)
b)
c)
d)
192 g , 134.3L
64.0 g , 22.4 L
64.0 g , 3.00 L
96.0 g , 67.2 L
28. The reaction in which increased pressure has no effect on the equilibrium reaction is
a)
b)
c)
d)
CO2(g) + H2(g)
CO(g) + H2O(g)
N2(g) + 3 H2(g)
2 NH3(g)
2 H2(g) + CO(g)
CH3OH(L)
CaCO3(s) CaO(s) + CO2(g)
6 C
29. The equilibriium constan
nt for the following reaaction: N2(gg) + 3H2(g)
2NH3(g
g) is 70 at
o
350 C.
C A system at equilibriium has [N2] = 0.2 M aand [H2] = 0.1
0 M. Whatt is the [NH
H3]?
a)
b)
c)
d)
0.371
0.118
0.237
0.302
30. Kcc will be eqqual to Kp iff _____.
a)
b)
c)
d)
∆n = 1
∆n = 0
RT = 0
∆n = ∞
he correct orrder of radius in the following is
31. Th
a)
b)
c)
d)
Cl- < Cl
O-2 < O
Fe+2 > Fe
Fe +2 > Fee+3
w
of the following compounds
c
is aromaticc?(b)
32. which
a) CH3-CH2-CH
- 3
b)
= 2
c) CH3-CH2=CH
CH3-C≡
C
CH
d)
Whichh of these ellements hass the lowest electronegaativity?
a)
b)
c)
d)
51Sb
33As
31Ga
55Cs
34. The nickel (III) ion, Ni2+, has how many
m
3d electrons?
a)
b)
c)
d)
0
7
8
5
7 C
35. Which
W
one of these elem
ments (perio
od 4) is a traansition elem
ment?
a)
b)
c)
d)
Br
As
Ca
Zn
36. The correct order
o
in the first ionizattion energy is:
a)
b)
c)
d)
N <O < C < Si
Si < C <O
O <N
O > N > C > Si
C > N > O > Si
37. The general formula
f
of an
a alkene iss
a)
b)
c)
d)
CnH2n+2
C2nH2n
CnH2n
CnH2n-2
38. Th
he functionaal group in this
t compou
und CH3CH
H2CH2CH2OH
O is
a)
b)
c)
d)
Alcohol
Aldehydee
Amine
Ether
39. A protein is
a)
b)
c)
d)
a polymerr of ester.
a polymer of amino acids.
an aromattic hydrocarrbon.
none of th
hese.
40. Which
W
of thesse is the sysstematic nam
me for the compound
c
r
represented
below?
a)
b)
c)
d)
3-methylp
pentane
2-ethylbuttane
2-methylp
pentane
3-ethylbuttane
8 C
9