Page 337 - Theory and Problems of BEGINNING CHEMISTRY

PRACTICE QUIZZES

For each quiz, you may use a periodic table and/or an electronic calculator, as necessary. The estimated time that
might be given to you is stated before each quiz.

Chapter 1 (5 minutes)
1. Name the element represented by each of the following symbols:
(a)Na (b)S (c)Sn (d )Ca

2. Write the symbol for each of the following elements:
(a) Potassium (b) Aluminum (c) Chlorine (d) Lead

3. Identify the element in group IB of the fifth period of the periodic table.

Chapter 2 (15 minutes)
1. Calculate each answer to the proper number of significant digits:
0.0450 kg (c)72.03 cm − 67.5cm =
(a) =
17.40 mL

(b)45.0cm + 67.5cm =

2. Calculate the volume of 125 g of mercury. (density = 13.6 g/mL)

3. For the following problem, calculate the answer in kilograms to the proper number of significant digits, and
give the answer in standard exponential notation:
2
5.25 × 10 −3 kg + 1.17 × 10 g =

Chapter 3 (15 minutes)
1. (a) Calculate the mass of sodium chloride formed from 20.0 g of sodium and 30.9 g of chlorine. Sodium
chloride is the only compound formed by this pair of elements and each sample of the elements reacted
completely. (b) State the law that allows this calculation. (c) Calculate the mass of sodium chloride formed
from 20.0 g of sodium and 40.0 g of chlorine. (d) State the law that allows this calculation.
2. State the number of neutrons in each of the following isotopes:

(a) 235 U (b) 3 H

3. Determine the atomic mass of bromine if 50.54% of naturally occurring bromine is 79 Br with mass of each
81
atom 78.92 amu, and the rest is Br, with mass of each atom 80.92 amu.

Chapter 4 (15 minutes)
1. Give the detailed electronic configuration of each of the following elements:
(a)Na (b)Fe (c) Hf (element 72)

2. Draw the shapes of the (a)1s orbital, (b)2p x orbital, and (c)3d xz orbital.

326