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Assignment 3_2007

# Assignment 3_2007 - (1 Cl 2 2KBr → 2KCl Br 2(2 C 2 H 4 H...

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CHEM001 Assignment 3 (Due on 6 November) 1. Use the definitions of acid and base to identify the first compound in each equation as an acid or a base (4 points) (1). H 2 O + H 2 O OH - + H 3 O + (2). Al(OH) 3 + NaOH Na H 2 AlO 3 + H 2 O (3). Na 2 CO 3 + 2CH 3 COOH 2CH 3 COONa + H 2 O + CO 2 (4). NaOCH 3 + C 6 H 5 OH CH 3 OH + C 6 H 5 ONa 2. What is the pH of the aqueous solution obtained from mixing 500 mL solution at pH 2.0 with 500 mL solution at pH 3.0 ? (4 points) 3. What is the pH value of hydroxide ion sodium hydroxide (NaOH) solution at 1.0 M ? Mix 1 mL of a solution at pH = 14 and 999 mL of a solution at pH = 2.5, what is the pH value of the resulting solution? (6 points)

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4. Are the following equations balanced ? If not, why not ? Answer these questions and then give the correct balanced equations. (6 points) (1) Sn 4+ + Fe 2+ Sn 2+ + Fe 3+ (2) 5H 2 O 2 + MnO 4 - + 6H + Mn 2+ + 8H 2 O + 3O 2 (g) 5. Circle the oxidizing agent and underline the reducing agent in each reaction (4 points)
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Unformatted text preview: (1). Cl 2 + 2KBr → 2KCl + Br 2 (2). C 2 H 4 + H 2 → C 2 H 6 (3). 2AgNO 3 + Cu → Cu(NO 3 ) 2 + 2 Ag (4). Zn + CuCl 2 → ZnCl 2 + Cu 6. In the following reactions, which substance is oxidized and which is reduced? (4 points) (1). H 2 CO + H 2 O 2 → H 2 CO 2 + H 2 O (2). 5C 2 H 6 O + 4MnO 4-+12 H + → 5C 2 H 4 O 2 + 4Mn 2+ + 11H 2 O (3). MoO 3 + 3H 2 → Mo + 3H 2 O (4). 6CO 2 + 6H 2 O → C 6 H 12 O 6 + 6O 2 7. The following is a reaction used to recover copper from waste solution containing CuSO 4 with metal zinc. Set up an electrochemical cell to accomplish the recovery. Please label the electrodes and write the reactions occurring at each electrode. (12 points) CuSO 4 + Zn → ZnSO 4 + Cu...
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Assignment 3_2007 - (1 Cl 2 2KBr → 2KCl Br 2(2 C 2 H 4 H...

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