CHM2032 HW 8

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Chemistry

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Apr 3, 2024

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Question 1 0 / 0.5 pts Select a statement that best describes the oxidation process. A) In the oxidation process all elements change oxidation state. B) In the oxidation process all elements experience an increase in oxidation state. D) In the oxidation process some elements experience oxidation state increase. E) In the oxidation process only oxygen increases its oxidation state. E D A B Incorrect

Question 2 0 / 1 pts In which of the following pairs is the oxidation number for the underlined element INCORRECT? A) Mn O 4- (+7 ) B) S O 42- (+4) C) N H 4+ (-3) D) N O 3- (+5) E) Cr 2 O 72- (+6) B A D E

C Question 3 1 / 1 pts Among the following reactions, find those that are redox reactions: 1) MnO 4- (aq) + 5 Fe 2+ (aq) + 8 H + (aq) → 5 Fe 3+ (aq) + Mn 2+ (aq) + 4 H 2 O (l) 2) 6 HF (aq) + Al(OH) 3 (s) + 3 NaOH (aq) → Na 3 AlF 6 (s) + 6 H 2 O (l) 3) Au (s) + 4 H + (aq) + NO 3- (aq) + 4 Cl - (aq) → [AuCl 4 ] - (aq) + 2 H 2 O + NO (g) 4) FeS (s) + 2 HCl (aq) → FeCl 2 (aq) + H 2 S (g) 5) SiO 2 (s) + 4HF (aq) → SiF 4 (g) + H 2 O (l)

A) reaction 1) B) reaction 2) C) reactions 1) and 3) D) reactions 2) and 5) E) reaction 4) C D A E B Incorrect Question 4

0 / 0.5 pts How many electrons are transferred when the perchlorate ion is converted to chloride? A) 8 B) 7 C) 9 D) 6 E) 5 E A D C B

Question 5 1 / 1 pts When the following equation is completed and balanced for the reaction in acidic aqueous solution, what is the proper coefficient for H+? Zn (s) + Cr 2 O 72- (aq) → Zn 2+ (aq) + Cr 2+ (aq) A) 22 B) 18 C) 14 D) 11

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