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General Chemistry I Homework: Identifying Statements and Completing Reactions, Exams of Chemistry

South Carolina State University (SCSU)Chemistry

A series of questions and statements from a general chemistry i homework assignment at south carolina state university. Students are asked to identify the correct answer for each statement or complete a chemical reaction by filling in the missing letter or blank. Topics covered include atomic properties, compounds, ionic equations, and redox reactions.

Typology: Exams

Pre 2010

Uploaded on 08/18/2009

koofers-user-mlz
koofers-user-mlz ๐Ÿ‡บ๐Ÿ‡ธ

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South Carolina State University
Department of Biological and Physical Sciences
General Chemistry I, Chemistry 150-Hamidi, Homework chapter 4, s05ch4 Name:โ€ฆโ€ฆโ€ฆโ€ฆโ€ฆ..
Identify the letter of the choice that best completes the statement or answers the question.
____ 1. The chemical behavior of a group of elements is determined by the __________ of the atoms in the group.
a. mass numbers
b. atomic numbers
c. atomic weights
d. atomic mass units
e. Avogadro numbers
____ 2. Which element is not correctly classified?
Element Classification
a. S nonmetal
b. Ge metalloid
c. Se metalloid
d. Li metal
e. In metal
____ 3. Which one of the statements below is false concerning the following reaction:
NH3(g) + H2O(l) NH4
+(aq) + OH-(aq)
a. The double arrows indicate that ammonia, NH3, is only very slightly soluble in water.
b. The reaction is reversible.
c. When NH3 is added to H2O, NH4
+ and OH- ions are produced in a 1:1 ratio.
d. When solutions of NH4Cl and NaOH are mixed, some ammonia is produced.
e. Ammonia is considered a weak base.
____ 4. 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
____ 5. What is the total ionic equation for the following formula unit equation?
BaCl2(aq) + Na2SO4(aq) โ†’ BaSO4(s) + 2NaCl(aq)
a. [Ba2+(aq)+Cl-(aq)] + [Na+(aq)+SO4
2-(aq)] โ†’ BaSO4(s) + [Na+(aq)+Cl-(aq)]
b. [Ba2+(aq)+2Cl-(aq)] + [2Na+(aq)+SO4
2-(aq)] โ†’ BaSO4(s) + 2[Na+(aq)+Cl-(aq)]
c. [Ba2+(aq)+2Cl-(aq)] + 2[Na+(aq)+SO4
2-(aq)] โ†’ BaSO4(s) + 2[Na+(aq)+Cl-(aq)]
d. [Ba2+(aq)+2Cl-(aq)] + [Na+(aq)+SO4
2-(aq)] โ†’ BaSO4(s) + [Na+(aq)+Cl-(aq)]
e. Ba2+(aq) + SO4
2-(aq) โ†’ BaSO4(s)
____ 6. What is the net ionic equation for the following formula unit equation?
Cu(NO3)2(aq) + H2S(aq) โ†’ CuS(s) + 2HNO3(aq)
a. Cu2+(aq) + H2S(aq) โ†’ CuS(s) + 2H+(aq)
b. [Cu2+(aq)+2NO3
-(aq)] + H2S(aq) โ†’ CuS(s) + 2[H+(aq)+2NO3
-(aq)]
c. Cu2+(aq) + 2H+(aq) + S2-(aq) โ†’ CuS(s) + 2H+(aq)
d. Cu2+(aq) + S2-(aq) โ†’ CuS(s)
e. Cu2+(aq) + 2NO3
-(aq) + 2H+(aq) + S2-(aq) โ†’ CuS(s) + 2H+(aq) + 2NO3
-(aq)
pf3

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South Carolina State University

Department of Biological and Physical Sciences

General Chemistry I, Chemistry 150-Hamidi, Homework chapter 4, s05ch4 Name:โ€ฆโ€ฆโ€ฆโ€ฆโ€ฆ..

Identify the letter of the choice that best completes the statement or answers the question.

____ 1. The chemical behavior of a group of elements is determined by the __________ of the atoms in the group. a. mass numbers b. atomic numbers c. atomic weights d. atomic mass units e. Avogadro numbers

____ 2. Which element is not correctly classified? Element Classification a. S^ nonmetal b. Ge^ metalloid c. Se^ metalloid d. Li^ metal e. In^ metal

____ 3. Which one of the statements below is false concerning the following reaction: NH 3 (g) + H 2 O(l) NH 4 +(aq) + OH-(aq) a. The double arrows indicate that ammonia, NH 3 , is only very slightly soluble in water. b. The reaction is reversible. c. When NH 3 is added to H 2 O, NH 4 +^ and OH-^ ions are produced in a 1:1 ratio. d. When solutions of NH 4 Cl and NaOH are mixed, some ammonia is produced. e. Ammonia is considered a weak base.

____ 4. Which one of the following compounds is incorrectly identified as to type of compound? Substance Type of Compound a. KOH strong base b. HClO^4 strong acid c. HNO 2 weak acid d. NH 3 insoluble base e. H 2 SO 3 weak acid

____ 5. What is the total ionic equation for the following formula unit equation? BaCl 2 (aq) + Na 2 SO 4 (aq) โ†’ BaSO 4 (s) + 2NaCl(aq) a. (^) [Ba2+(aq)+Cl-(aq)] + [Na+(aq)+SO 4 2-(aq)] โ†’ BaSO 4 (s) + [Na+(aq)+Cl-(aq)] b. (^) [Ba2+(aq)+2Cl-(aq)] + [2Na+(aq)+SO 4 2-(aq)] โ†’ BaSO 4 (s) + 2[Na+(aq)+Cl-(aq)] c. (^) [Ba2+(aq)+2Cl-(aq)] + 2[Na+(aq)+SO 4 2-(aq)] โ†’ BaSO 4 (s) + 2[Na+(aq)+Cl-(aq)] d. (^) [Ba2+(aq)+2Cl-(aq)] + [Na+(aq)+SO 4 2-(aq)] โ†’ BaSO 4 (s) + [Na+(aq)+Cl-(aq)] e. (^) Ba2+(aq) + SO 4 2-(aq) โ†’ BaSO 4 (s)

____ 6. What is the net ionic equation for the following formula unit equation? Cu(NO 3 ) 2 (aq) + H 2 S(aq) โ†’ CuS(s) + 2HNO 3 (aq) a. (^) Cu2+(aq) + H 2 S(aq) โ†’ CuS(s) + 2H+(aq) b. (^) [Cu2+(aq)+2NO 3 - (aq)] + H 2 S(aq) โ†’ CuS(s) + 2[H+(aq)+2NO 3 - (aq)] c. (^) Cu2+(aq) + 2H+(aq) + S2-(aq) โ†’ CuS(s) + 2H+(aq) d. (^) Cu2+(aq) + S2-(aq) โ†’ CuS(s) e. (^) Cu2+(aq) + 2NO 3 - (aq) + 2H+(aq) + S2-(aq) โ†’ CuS(s) + 2H+(aq) + 2NO 3 - (aq)

____ 7. What are the oxidation numbers (oxidation states) of the elements in KClO 2? a. K = +3, Cl = +3, O = - b. K = -1, Cl = -5, O = + c. K = +1, Cl = +5, O = - d. K = +1, Cl = +3, O = - e. K = +1, Cl = +2, O = -

____ 8. Which of the following matched pairs of name and formula has an error? Formula Name a. CaF 2 calcium fluoride b. HCN^ hydrogen cyanide c. KBr^ potassium bromide d. Na 2 S sodium sulfate e. Ba(SCN) 2 barium thiocyanate

____ 9. Which of the following matched pairs of name and formula has an error? Formula Name a. SnCl 4 tin(IV) chloride b. Fe 2 (CrO 4 ) 3 iron(III) chromate c. SnO tin(II) oxide d. Cu 2 O^ copper(II) oxide e. MnCO 3 manganese(II) carbonate

____ 10. Which response contains all of the following that are oxidation-reduction reactions and no others? I. (^) PCl 3 (l) + 3H 2 O(l) โ†’ 3HCl(aq) + H 3 PO 3 (aq) II. (^) Fe 2 O 3 (s) + 3CO(g) โ†’ 2Fe(s) + 3CO 2 (g) III. CaCO 3 (s) + 2HClO 3 (aq) โ†’ Ca(ClO 3 ) 2 (aq) + CO 2 (g) + H 2 O(l)

a. I b. II c. III d. II and III e. I and II

____ 11. In the following reaction NaClO 3 is __________. 5NaClO 3 (aq) + 3H 2 O(l) + 3I 2 (s) โ†’ 6HIO 3 (aq) + 5NaCl(aq) a. the oxidizing agent and is oxidized. b. the oxidizing agent and is reduced. c. the reducing agent and is oxidized. d. the reducing agent and is reduced. e. neither an oxidizing agent nor a reducing agent.

____ 12. Which of the following is both a decomposition reaction and a reduction-oxidation reaction? a. (^) H 2 CO 3 (aq) โ†’ CO 2 (g) + H 2 O(l) b. (^) Zn(s) + CuNO 3 (aq) โ†’ Cu(s) + ZnNO 3 (aq) c. (^) Ca(OH) 2 (aq) + 2HCl(aq) โ†’ CaCl 2 (aq) + 2H 2 O(l) d. (^) 2NH 4 NO 3 (s) โ†’ 2N 2 (g) + O 2 (g) + 4H 2 O(g) e. (^) CaCO 3 (s) โ†’ CaO(s) + CO 2 (g)

____ 13. Which one of the following acids does not produce H 2 (g) as a major product of reaction with a moderately active metal like zinc? a. H 2 SO 4 b. HCl c. HClO 4 d. HClO 3 e. HNO 3

____ 14. Which one of the following metals is least active? a. Ca b. K c. Pt d. Li e. Al