Download Exam 2 green multiple choice questions - PDF file

Chemistry 110
Exam 2 - Green
11/16/00
The multiple-choice portion of this exam has 17 questions on 3 pages totaling 85 points. Be sure
to include your name and 9 digit ID number on the answer sheet. Blacken in all selections
using a No. 2 pencil.
The written portion of this exam has 3 questions totaling 15 points. Be sure to include your
name and 9 digit ID number in the spaces provided.
Turn in both the bubble answer sheet and the hand written sheet together. Keep the
multiple-choice questions to check your answers against the posted keys.
Keys will be posted on the web as soon as possible after the exam.
Information for your use:
Strong electrolytes: HCl, NaOH, all soluble salts
Weak electrolytes: H2O
Soluble: all acids, Na2SO4, NaCl
Not soluble: Cu(OH)2,
Oxidation numbers: in compounds H = +1, O = –2
A periodic table page is attached.
1. (5 points) Which of the following should be written in ionic form in an ionic equation for a
reaction in aqueous solution?
(A) a weak acid
2.
(B) a precipitate
(C) water
(D) a soluble salt
(E) a gas
(5 points) Which of the following is the net ionic equation that best describes the overall
reaction that occurs when aqueous solutions of copper sulfate and sodium hydroxide are
mixed?
(A)
(B)
(C)
(D)
(E)
2 NaOH + Cu2+ → 2 Na+ + Cu(OH)2
CuSO4 + 2 OH → Cu(OH)2 + SO42H+ + OH- → H2O
2 Na+ + SO42- → Na2SO4
Cu2+ + 2 OH- → Cu(OH)2
3. (5 points) In the reaction NH4+ + H2O → NH3 + H3O+ , the NH4+ ion acts as:
(A) an oxidizing agent
(B) a reducing agent
(C) a Bronsted-Lowry base
(D) a Bronsted-Lowry acid
(E) a neutral ion
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4.
(5 points) Which of the following is the net ionic equation that best describes the overall
reaction that occurs when aqueous solutions of Na2CO3 and HCl are mixed?
(A) CO32- + 2H+ → H2O + CO2
(B) Na+ + Cl- → NaCl
(C) Na2CO3 + 2 HCl → 2NaCl + H2O + CO2
-
(D) CO32- + 2HCl → H2CO3 + 2Cl
(E) Na2CO3 + 2H+ → 2Na+ + H2O + CO2
5.
(5 points) In the following oxidation-reduction reaction the element oxidized is ____ and the
reducing agent is ____.
WO3(s) + 3 H2(g) → W(s) + 3 H2O(l)
(A) W, WO3
(B) O, WO3
(C) H, WO3
(D) W, H2O
(E) H, H2
6. (5 points) For the oxidation-reduction reaction Mg(s) + Ni(NO3)2(aq) → Ni(s) + Mg(NO3)2
(aq), the net ionic equation for the reduction half reaction is:
(A) Mg2+ + 2e- → Mg
(B) Ni2+ + 2e- → Ni
(C) Mg → Mg2+ + 2e(D) Ni → Ni2+ + 2e-
(E) Mg → Ni2+ + 2e-
Use the following thermochemical equation to answer questions 7 and 8.
4 CO2(g) + 2 H2O(l) → 2C2H2(g) + 5 O2(g)
7.
(5 points) The reaction is ____________ because the products have a ___________ enthalpy
than the reactants.
(A) exothermic, higher
(B) exothermic, lower
8.
∆H° = 2599 kJ
(C) endothermic, higher
(D) endothermic, lower
(E) neither, same
(5 points) What is ∆H° in kJ for the reaction 2 CO2(g) + H2O(l) → C2H2(g) + 5/2 O2(g)
(A) 650
(B) –1300
(C) 1300
(D) 2599
(E) –2599
9. (5 points) Given the following standard enthalpies of formation, determine ∆H° in kJ for the
reaction 4 HCl (g) + O2 (g) → 2 Cl2 (g) + 2 H2O (g)
∆H °f for HCl(g) = – 92 kJ/mol
(A) –116
(B) 116
(C) 150
∆H °f for H2O(g) = – 242 kJ/mol
(D) –150
(E) –334
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10. (5 points) For the hydrogen atom, an electron in a 4s orbital would have a _______ energy
and a ______ probability of being further from the nucleus than an electron in a 1s orbital?
(A) higher, greater
(B) higher, lower
(C) lower, greater
(D) lower, lower
(E) the same, the same
11. (5 points) For the n=2 shell in an atom, there are a total of _______ orbitals which can hold a
maximum of ______ electrons.
(A) 2, 2
(B) 2, 4
(C) 2, 8
(D) 3, 6
(E) 4, 8
12. (5 points) How many unpaired electrons are there in a ground state neutral C atom?
(A) 0
(B) 1
(C) 2
(D) 3
(E) 4
13. (5 points) How many of the five species Ar, O2-, S2-, Be2+, Mg2+ are isoelectronic with Ne?
(A) 1
(B) 2
(C) 3
(D) 4
(E) 5
14. (5 points) If a metal M with the valence electron configuration ns2 reacts with a non-metal X
with the valence electron configuration ns2np4, what would be the formula of the ionic
compound formed?
(A) M2X
(B) MX2
(C) MX
(D) MX3
(E) M2X3
15. (5 points) An element with a valence electron configuration of ns1 is
(A) a halogen
(B) a lanthanide
(C) a transition metal
(D) an alkali metal
(E) a noble gas
16. (5 points) Arrange the elements F, K, Br, Cs in order of increasing atomic radius.
(A) F<K<Br<Cs
(B) F<Br<K<Cs
(C) K<Cs<F<Br
(D) Cs<K<Br<F
(E) Cs<K<F<Br
17. (5 points) Arrange the elements F, K, Br, Cs in order of increasing electronegativity.
(A) Cs<K<Br<F
(B) F<Br<K<Cs
(C) K<Cs<F<Br
(D) F<Br<K<Cs
(E) Cs<Br<K<F
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11/16/00