Page 340 - Theory and Problems of BEGINNING CHEMISTRY

PRACTICE QUIZZES 329

Chapter 17 (20 minutes)
1. Calculate the pH after 0.100 mol of NH 3 and 0.200 mol of NH 4 Cl are dissolved in 1.00 L of solution and
−5
allowed to come to equilibrium. K b = 1.8 × 10 .

2. Calculate the hydronium ion concentration after 0.250 mol HC 2 H 3 O 2 and 0.100 mol NaOH are dissolved in
−5
1.00 L of solution and allowed to come to equilibrium. K a = 1.8 × 10 .

Chapter 18 (10 minutes)
1. State the class of compound represented by each of the following compounds:
(b)CH 3 OH
(a)CH 4 (c)CH 3 COCH 3 (d )CH 3 CONHCH 3 (e)CH 3 CO 2 CH 3
2. Identify all isomers of CH 3 CH 2 CH 2 OH.

3. Identify all isomers of CH 3 CH 2 CH 2 NH 2 .

Chapter 19 (15 minutes)
1. Complete the following nuclear equations:

(a) 22 Na −→ 22 Ne + ?
1
(b) 14 N + ? −→ 17 O + H
1
1
94
(c) 235 U + n −→ ? + Kr + 2 n
2. Calculate the time required for an isotope to disintegrate to 40.0% of its original mass if its half-life is 50.0
years.