Your exam may have the problems in a different order.

Answer key to the following exam:

1) C 2) D 3) D 4) C (1pt for B) 5) A (1pt for C or D) 6) D 7) C 8) B 9) C 10) A (1pt for C or D) 11) E (1pt for A) 12) B 13) C 14)D 15) C 16) B 17) B 18) A 19) A 20) D 21) E 22) D (1pt for C) 23) C 24) C 25) D

1. Which element and group are not correctly matched?

Element Periodic Group or Classification

(a) Sb metalloid

(b) Kr noble gas

(c) Al alkali metal

(d) F halogen

(e) Ca alkaline earth metal

 

2. Which one of the following compounds is incorrectly identified as to type of

compound?

Substance Type of Compound

(a) KOH strong base

(b) HClO4 strong acid

(c) HNO2 weak acid

(d) NH3 insoluble base

(e) H2SO3 weak acid

3. Which one of the following compounds is not a strong electrolyte?

(a) RbF (b) Ni(ClO3)2 (c) Mg(NO3)2

(d) HF (e) HNO3

4. What is the total ionic equation for the following formula unit equation?

HF(aq) + KOH(aq) Æ KF(aq) + H2O(l)

(a) [H+(aq)+F-(aq)] + [K+(aq)+OH-(aq)] Æ [K+(aq)+F-(aq)] + [2H+(l)+O2-(l)] (b) [H+(aq)+F-(aq)] + [K+(aq)+OH-(aq)] Æ [K+(aq)+F-(aq)] + H2O(aq) (c) HF(aq) + [K+(aq)+OH-(aq)] Æ [K+(aq)+F-(aq)] + H2O(l)

(d) HF(aq) + [K+(aq)+OH-(aq)] Æ [K+(aq)+F-(aq)] + [2H+(aq)+OH-(aq)]

(e) HF(aq) + OH-(aq) Æ F-(aq) + H2O(l)

5. What is the net ionic equation for the following formula unit equation?

Cu(NO3)2(aq) + H2S(aq) Æ CuS(s) + 2HNO3(aq)

(a) Cu2+(aq) + H2S(aq) Æ CuS(s) + 2H+(aq)

(b) [Cu2+(aq)+2NO3-(aq)] + H2S(aq) Æ CuS(s) + 2[H+(aq)+2NO3-(aq)]

(c) Cu2+(aq) + 2H+(aq) + S2-(aq) Æ CuS(s) + 2H+(aq)

(d) Cu2+(aq) + S2-(aq) Æ CuS(s)

(e) Cu2+(aq) + 2NO3-(aq) + 2H+(aq) + S2-(aq) Æ CuS(s) + 2H+(aq) + 2NO3-(aq)

6. Determine the oxidation number of the underlined element in .

(a) +6 (b) +8 (c) +3 (d) +4 (e) +5

7. In the following reaction CO is ____________.

Fe2O3(s) + 3CO(g) Æ 2Fe(s) + 3CO2(g)

    1. the oxidizing agent and is oxidized
    2. the oxidizing agent and is reduced
    3. the reducing agent and is oxidized

(d) the reducing agent and is reduced

(e) neither an oxidizing agent nor a reducing agent

8. Which of the following reactions is a combination reaction?

(a) AgNO3(aq) + HCl(aq) Æ AgCl(s) + HNO3(aq)

(b) Na2O(s) + CO2(g) Æ Na2CO3(s)

(c) C3H8(g) + 5O2(g) Æ 3CO2(g) + 4H2O(l)

(d) 2H2O(l) Æ 2H2(g) + O2(g)

(e) KOH(aq) + HCl(aq) Æ KCl(aq) + H2O(l)

9. Which response lists all the reactions below that will occur in aqueous solution,

and no other reactions?

I. Br2(l) + 2F-(aq) Æ 2Br -(aq) + F2(g)

II. Cl2(g) + 2I-(aq) Æ 2Cl-(aq) + I2(s)

III. Br2(l) + 2I-(aq) Æ 2Br -(aq) + I2(s)

IV. Cl2(g) + 2Br -(aq) Æ 2Cl-(aq) + Br2(l)

(a) II and III (b) I, II, and IV (c) II, III, and IV (d) I and IV (e) I, II, III, and IV

10. Will a precipitate form when 0.1 M aqueous solutions of HBr and Pb(CH3COO)2 are mixed? If a precipitate does form, identify the precipitate and give the net ionic equation for the reaction.

(a) PbBr2 precipitates. 2[H+(aq)+Br -(aq)] + [Pb2+(aq)+2CH3COO-(aq)]Æ

PbBr2(s) + 2CH3COOH(aq)

(b) CH3COOH precipitates H+(aq) + CH3COO-(aq) Æ CH3COOH(s)

(c) PbBr2 precipitates. Pb2+(aq) + 2Br -(aq) Æ PbBr2(s)

(d) PbBr2 precipitates. Pb(CH3COO)2(aq) + 2Br -(aq) Æ PbBr2(s) + 2CH3COO-(aq)

(e) No precipitate forms.

11. Classify the following reaction by giving all of these reaction type(s) that apply.

I. redox II. combination III. decomposition

IV. displacement V. metathesis

Zn(s) + 2HCl(aq) Æ ZnCl2(aq) + H2(g)

(a) only I (b) only II (c) only III (d) only V (e) I and IV

12. Which of the following matched pairs of name and formula has an error?

Formula Name

(a) N2O4 dinitrogen tetroxide

(b) P4O6 phosphorus hexoxide

(c) OF2 oxygen difluoride

(d) NO nitrogen oxide

(e) Mn2O7 manganese(VII) oxide

13. Give the number of protons, neutrons, and electrons in an atom of the 41K isotope.

(a) 19 p, 22 n, 22 e (b) 41 p, 19 n, 41 e (c) 19 p, 22 n, 19 e

(d) 19 p, 16 n, 19 e (e) 15 p, 26 n, 15 e

14. A hypothetical element consists of the following naturally occurring isotopes. What is the atomic weight of the element?

Isotopes Mass Abundance

1 46.041 amu 26.00%

2 47.038 amu 58.00%

3 49.034 amu 16.00%

(a) 46.78 amu (b) 46.89 amu (c) 47.02 amu (d) 47.10 amu (e) 47.24 amu

15. What is the energy, in J/photon, of blue light having a wavelength of 4.240 x 10-7 m? E=hc/l h=6.63*10-34J.s c=3.00*108 m/s

(a) 2.81 x 10-38 J/photon (b) 6.42 x 10-17 J/photon (c) 4.69 x 10-19 J/photon (d) 7.07 x 10-20 J/photon (e) 6.28 x 10-11 J/photon

16. Which quantum number is often designated by the letters s, p, d and f?

(a) n (b) l (c) ml (d) ms (e) y

17. Which one of the following ground state electron configurations is incorrect?

(a) 20Ca [Ar]4s2

(b) 25Mn [Ar]4s24d5

(c) 29Cu [Ar]3d104s1

(d) 50Sn [Kr]4d105s25p2

(e) 54Xe [Kr]4d105s25p6

18. Which element has the largest atomic radius?

(a) Al (b) Si (c) P (d) S (e) Cl

19. Which element has the highest first ionization energy?

(a) B (b) Al (c) Ga (d) In (e) Tl

20. The general electron configuration for the element group that would have the largest negative value for the electron affinity for its atoms is ________?

(a) ns2np6 (b) ns2np4 (c) ns1 (d) ns2np5 (e) ns2np3

21. Which ion or atom has the largest radius?

(a) Sr2+ (b) Rb+ (c) Kr (d) Br- (e) Se2-

22. Which Lewis dot notation for atoms and ions is correct for the reaction for the formation

of aluminum oxide?

(a)

(b)

(c)

(d)

(e)

23. The negative ion F- is isoelectronic to the positive ion ____.

(a) Ca2+ (b) Li+ (c) Mg2+ (d) K+ (e) Sc3+

24. The Lewis dot formula for N2 shows

(a) a single covalent bond. (b) a double covalent bond.

(c) a triple covalent bond. (d) a single ionic bond.

(e) a total of 8 x 2 = 16 electrons.

25. The elements of Group VIIA may react with each other to form covalent compounds. Which of the following single covalent bonds in such compounds is the most polar bond?

(a) F-F (b) F-Cl (c) F-Br (d) F-I (e) Cl-I