162exam_answers_Exam_2

162exam_answers_Exam_2 - Highest Oxi- dation State Hydride...

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Chem 162, Spring 2008, Prof. Norman, Mid-Term Exam #2, Page 2 1. (4 points). Draw connecting lines to match each solute with the liquid solvent in which it is most soluble. Each solvent matches one solute. Solute Solvent (CH 3 ) 2 S NH 3 Acid H 2 S + base NH 3 . H 2 S HF Base K 2 S + acid HF. K 2 S CH 3 OH Both form hydrogen bonds . CH 3 NH 2 CH 2 C l 2 Similar polarity. 2. (4 points). Fill in formulas for all stable neutral compounds between the pairs. Rb (Z = 37) and P ____ Rb 3 P ____ In (Z = 49) and S ___ In 2 S, In 2 S 3 ___ A l aqua ion and carbonate __ [A l (H 2 O) 6 ] 2 (CO 3 ) 3 __ 3. (10 points). For the elements listed, fill in the table below as follows. a. Oxidation State : What is the highest oxidation state found for each element? b. Hydride Structure : Choose among ionic, molecular, network, and solid solution. c. Hydride Acidity : Choose among acidic, basic, and neutral. Omit Cr. d. Oxide Acidity : In the element’s highest oxidation state. Choose among acidic, basic, and amphoteric. e. E o : Rank the elements from strongest ( 1 ) to weakest ( 6 ) reductant. Element
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Unformatted text preview: Highest Oxi- dation State Hydride Structure Hydride Acidity Oxide Acidity E o A l +3 network basic amphoteric 3 C +4 molecular neutral acidic 5 Li +1 ionic basic basic 1 Cs +1 ionic basic basic 2 C l +7 molecular acidic acidic 6 Cr +6 solid solution acidic 4 4. (12 points). Four of the substances below react with excess HNO 3 (aq). Write and balance these 4 reactions. Include phases. Write dissolved ionic products together; that is, CsI(aq), not Cs + (aq) + I (aq). Omit H 2 O molecules covalently bound to metal ions. A l (s); Au(s); C l 2 (g); O 2 (g); C 2 H 5 Li(s); KF(s); NaC l O 4 (s); BeH 2 (s). A l (s) + 3 HNO 3 (aq) 3/2 H 2 (g) + A l (NO 3 ) 3 (aq) or A l (s) + 6 HNO 3 (aq) 3 NO 2 (g) + A l (NO 3 ) 3 (aq) + 3 H 2 O( l ) C 2 H 5 Li(s) + HNO 3 (aq) C 2 H 6 (g) + LiNO 3 (aq) KF(s) + HNO 3 (aq) HF(aq) + KNO 3 (aq) BeH 2 (s) + 2 HNO 3 (aq) 2 H 2 (g) + Be(NO 3 ) 2 (aq)...
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This note was uploaded on 05/17/2008 for the course CHEM 162 taught by Professor N. during the Spring '08 term at University of Washington.

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