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Exam 4A – Key
- A
- C
- D
- B
- D
- B
- B
- D
- A
- A
- A
- K = [Mg2+] [F1-]^2 K =
[ 𝐻𝐶𝑙 ]^2
[ 𝐻 2 ] [ 𝐶𝑙 2 ]
- a)
b) 150 mL x
x
x
14. 2 C 5 H 10 OS + 17 O 2 10 CO 2 + 10 H 2 O + 2 SO 3
- no reaction Ca 3 (PO 4 ) 2 PbSO 4
- -2 +5 -
- 5 e-^ oxidation 2 e-^ oxidation
- 2 Cr3+(aq) + 3 S2-(aq) ⇌ Cr 2 S 3 (s)
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CH 101 – 002 Fourth Exam – Form A – Special Code 1111__ __ April 15, 2015
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Useful Information Avogadro’s Number = 6.02 x 10^23 R = 0.0821 L-atm / K-mol Questions #1 – 11 are worth 10 points each; answers for those questions should be placed on the scantron sheet. Point values of #12 – 18 are given in parentheses in the question; answers for those questions should be placed directly on this exam
1A 8A
H
1.008 2A^ 3A^ 4A^ 5A^ 6A^ 7A
He
3 Li
Be
B
C
N
O
F
Ne
11 Na
Mg 24.31 3B^ 4B^ 5B^ 6B^ 7B^ 8B^ 1B^ 2B
Al
Si
P
S
Cl
Ar
19 K
Ca
Sc
Ti
V
5 0.
Cr
Mn
Fe
Co
Ni
Cu
Zn
Ga
Ge
As
Se
Br
Kr
37 Rb
Sr
Y
Zr
Nb
Mo
Tc (98)
Ru
Rh
Pd
Ag
Cd
In
Sn
Sb
Te
I
Xe
55 Cs
Ba
La
Hf
Ta
W
Re
Os
Ir
Pt
Au
Hg
Tl
Pb
Bi
Po (209)
At (210)
Rn (222) 87 Fr (223)
Ra
Ac
Rf (267)
Db (268)
Sg (269)
Bh (270)
Hs (269)
Mt (278)
Ds (281)
Rg (281)
Cn (285)
Fl (289)
Lv (293)
58 Ce
Pr
Nd
Pm (145)
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lu
90 Th
Pa
U
Np
Pu (244)
Am (243)
Cm (247)
Bk (247)
Cf (251)
Es (252)
Fm (257)
Md (258)
No (259)
Lr (262)
For the next two questions, consider the following reactions:
Reaction I) 2 NO 2 (g) ⇌ N 2 O 4 (g) Reaction II) 2 NO 2 (g) + H 2 O(l) ⇌ HNO 3 (aq) + HNO 2 (aq)
- Which reaction is a redox reaction? A) Reaction I only B) Reaction II only C) Both Reactions I and II D) Neither Reaction I nor II
- If you were to use reaction II to produce HNO 3 , and if the reaction were exothermic, which of the following would maximize the yield of HNO 3?
A) remove H 2 O and increase the temperature B) remove HNO 2 and increase the temperature C) remove H 2 O and decrease the temperature D) remove HNO 2 and decrease the temperature
- How many of the following are strong electrolytes?
i) C 6 H 12 O 6 ii) CH 3 OH iii) NaC 2 H 3 O 2 iv) Cl 2
A) one B) two C) three D) four E) none of them
- In the following reaction, identify the oxidizing agent:
3 SeO 32 ^ + 4 Bi + 3 H 2 O ⇌ 3 Se + 2 Bi 2 O 3 + 6 OH^1
A) SeO 32 B) Bi C) H 2 O D) Se E) Bi 2 O 3
- Consider the following entries in a table of standard reduction potentials and the two statements below:
Fe2+^ + 2 e1-^ ⇌ Fe 0.44 V Ni2+^ + 2 e1-^ ⇌ Ni 0.23 V Statement 1 : Ni2+^ is a stronger oxidizing agent than Fe2+ Statement 2 : Ni is a stronger reducing agent than Fe
Which statement is true? A) Statement 1 B) Statement 2 C) Both 1 and 2 D) Neither 1 nor 2
- (6 each) Write an expression for the equilibrium constant for each of the following reactions:
MgF 2 (s) ⇌ Mg2+(aq) + 2 F^1 (aq) H 2 (g) + Cl 2 (g) ⇌ 2 HCl(g)
- (8 each) SET UP the following problems, showing the numbers you would use. You do NOT need to calculate a final answer; you will be graded on your setup.
a) 5.00 g of NaCl (Mm = 58.4 g/mol) are added to enough water to form 700 mL of solution. What is the molarity of this solution?
b) How many grams of Ca(NO 3 ) 2 (Mm = 164 g/mol) are needed to make 150 mL of 0.20 M Ca(NO 3 ) 2 solution?
- (10) Write a balanced equation, with integer coefficients, for the complete combustion of C 5 H 10 OS. You do not need to include states of matter for this question.
