fak chem hw 4 - To(st22362 Homework 4 Fakhreddine(52420 This print-out should have 20 questions Multiple-choice questions may continue on the next

fak chem hw 4 - To(st22362 Homework 4 Fakhreddine(52420...

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To (st22362) – Homework 4 – Fakhreddine – (52420) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 1.0 points Identify the Brønsted base in the FOR- WARD reaction HSO 3 (aq) + NH + 4 (aq) NH 3 (aq) + H 2 SO 3 (aq) . 1. H 2 SO 3 2. HSO 3 correct 3. NH 3 4. NH + 4 Explanation: A Brønsted base is a proton acceptor. 002 1.0 points Which is NOT a conjugate acid-base pair? 1. H 2 SO 4 : SO 2 4 correct 2. H 3 SO + 4 : H 2 SO 4 3. HCl : Cl 4. H 2 : H 5. H 2 O : OH Explanation: Except for H 2 SO 4 and SO 2 4 , the members of all of the pairs differ by one proton. 003 1.0 points In the reversible reaction HSO 3 + H 2 O SO 3 2 + H 3 O + , what two substances act as acids in the Bronsted-Lowry sense? 1. SO 2 3 and H 3 O + 2. some other pair 3. H 3 O + and H 2 O 4. HSO 3 and H 3 O + correct 5. HSO 3 and H 2 O Explanation: 004 1.0 points In the series HClO, HClO 2 , HClO 3 , HClO 4 , which is the strongest acid? 1. HClO 3 2. HClO 4 correct 3. HClO 4. HClO 2 Explanation: For any series of compounds containing hy- drogen, oxygen and a non-metal, the acidity increases as the number of the oxygen atoms in the molecule increases. 005 1.0 points Of the following, a) HBr b) HF c) HNO 3 d) HNO 2 e) H 2 CO 3 f) H 3 AsO 4 which acids are weak acids? 1. Another combination 2. a; b; e 3. a; b; c 4. d; e; f 5. b; d; e; f correct Explanation: Hydrofluoric acid (HF), nitrous acid (HNO 2 ), H 2 CO 3 (carbonic acid), and arsenic acid (H 3 AsO 4 ) are all considered weak acids since they do not dissociate completely. Hy- drobromic acid (HBr) and nitric acid (HNO 3 ) are considered strong acids due to complete dissociation.
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