1. Which of the following pairs are both electrolytes? NaOH and SO2 B. H2SO4 and
ID: 955707 • Letter: 1
Question
1. Which of the following pairs are both electrolytes?
NaOH and SO2 B. H2SO4 and NH4Cl C. CH3OH and C2H5OH D. HNO2 and NO2 E. CO2 and H2CO3
2. Which of the following is a weak electrolyte?
HBr(aq) B. KOH(aq) C. HNO3 D. H3PO4 E. Ba(OH)2
3. For which of the following pairs are both compounds insoluble in water?
NaBr, Na2SO4 B. Na2CO3, CaCO3 C. Fe2(CO3)3, Ba3(PO4)2 D. Na3PO4, Ca3(PO4)2 E. PbSO4, MgSO4
4. Which of the following is a weak acid?
A. HClO3 B. HCl C. HClO4 D. HNO3 E. HF
5. Which of the following is a Brønsted acid?
A. NH4+(aq) B. CH3COO– (aq) C. NH3 (aq) D. OH– (aq) E. Na+(aq)
6. Which of the following is a Brønsted base?
A. NH4+(aq) B. Na+(aq) C. HNO3(aq) D. NH3(aq) E. CH3COOH(aq)
7. In the reaction: NH3(aq) + H2O NH4+(aq) + OH–
A. In this reaction H2O is the Brønsted
acid B. NH3 is the Brønsted acid and NH4+ is the Brønsted base
C. OH– is a proton donor D. NH4+ is a Brønsted base
E. NH4+ is the Brønsted acid and NH3 is the Brønsted base, they are a conjugate acid-base pair
8. The oxidation numbers of S in SO32– and,SO42– are:
A. +2 and + 4 B. +3 and +6 C. +4 and +6 D. +6 and +8 E. –4 and –6
9. The oxidation number of Cr in the dichromate ion, Cr2O72– is:
A. +6 B. +5 C. +4 D. –4 E. +7
10. In the reaction: FeO + CO Fe + CO2
A. Fe is the oxidizing agent B. CO is reduced C. O2– is oxidized D. CO is the reducing agent
Fill in the answer for the following questions.
11. Chang 4.47 (with some changes). Give the oxidation number of the underlined element in the following compounds and ions:
CO2 CH4 C2H2 CrO3 K2CrO4 NaHCO3 PO43–
Ox.#: ____ ____ ____ ____ ____ ____ ____
12. Circle the correct answer for each
OH– is a Brønsted acid / Brønsted base / can be both
H3O+ is a Brønsted acid / Brønsted base / can be both
CO32– is a Brønsted acid / Brønsted base / can be both
HCO3– is a Brønsted acid / Brønsted base / can be both
PO43– is a Brønsted acid / Brønsted base / can be both
H3PO4 is a Brønsted acid / Brønsted base / can be both
H2PO4– is a Brønsted acid / Brønsted base / can be both
CH3COOH is a Brønsted acid / Brønsted base / can be both
CH3COO– is a Brønsted acid / Brønsted base / can be both
SO42– is a Brønsted acid / Brønsted base / can be both
13. Write the balanced molecular reaction and the net ionic reaction for the reaction between BaCl2 and Na3PO4 in aqueous solution:
Molecular reaction: ____BaCl2(aq) + ____Na3PO4(aq) ____ ___________ + ____ __________
Net ionic reaction:
14. Chang 4.55 (with some additions). Classify the following reactions as: acid-base, precipitation, combustion, combination, and displacement or disproportionation reaction:
2H2O2 2H2O + O2 _______________________________ reaction
Mg + 2AgNO3 Mg(NO3)2 + 2Ag _______________________________ reaction
BaCl2(aq) + MgSO4(aq) BaSO4(s) + MgCl2(aq) __________________________ reaction
NH3(aq) + HBr(aq) NH4Br(aq) _______________________________ reaction
2CO(g) + O2 2CO2(g) _______________________________ reaction
H2 + Br2 2HBr _______________________________ reaction
Explanation / Answer
1. B. H2SO4 and NH4Cl are both electrolytes.
2. D. H3PO4 is a weak electrolyte.
4. E. HF is a weak acid.
5. A. NH4+(aq) is a Brønsted acid. It is proton donor.
6. D. NH3(aq) is a Brønsted base. It is proton acceptor.
7. A. In this reaction H2O is the Brønsted acid.
E. NH4+ is the Brønsted acid and NH3 is the Brønsted base, they are a conjugate acid-base pair.
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