Zumdahl - Chemical Principles 5/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 17/25

Due: Saturday, April 2, 2011 08:00 EDT

Question

Points

1	2	3	4	5
14	3	0/3	0/2	0/3

Total

17/25

Description

Here are some textbook questions from Chemical Principles 5/e by Steven S. Zumdahl published by Brooks/Cole. Click here for a list of all of the questions coded in WebAssign.

Instructions

This demo assignment allows many submissions and allows you to try another version of the same question for practice.

1. 14/14 points All Submissions Notes Question: ZumChemP5 2.E.042.

Question part

Points

Submissions

1	2	3	4	5	6	7	8	9	10	11	12	13	14
1	1	1	1	1	1	1	1	1	1	1	1	1	1
1/50	1/50	1/50	1/50	1/50	1/50	2/50	2/50	1/50	2/50	1/50	1/50	1/50	3/50

Total

14/14

Write the formula for each of the following compounds. (Type your answer using the format CO2 for CO₂ and Mg(OH)2 for Mg(OH)₂.)

(a) calcium iodide Answer is case sensitive. 1	(b) mercury(I) sulfide Answer is case sensitive. 2	(c) sodium oxide Answer is case sensitive. 3
(d) lead(II) oxide Answer is case sensitive. 4	(e) zinc sulfide Answer is case sensitive. 5	(f) copper(II) nitrate Answer is case sensitive. 6
(g) potassium hydrogen sulfide Answer is case sensitive. 7	(h) nitrogen trichloride Answer is case sensitive. 8	(i) copper(I) chloride Answer is case sensitive. 9
(j) bromous acid Answer is case sensitive. 10	(k) sodium sulfite Answer is case sensitive. 11	(l) lead(IV) oxide Answer is case sensitive. 12
(m) potassium cyanide Answer is case sensitive. 13	(n) cadmium selenide Answer is case sensitive. 14

2. 3/3 points All Submissions Notes Question: ZumChemP5 3.AE.084.

Question part

Points

Submissions

1	2	3
1	1	1
1/50	1/50	1/50

Total

3/3

The compounds called chlorofluorocarbons, or Freons, were found to be very valuable as refrigerants and as cleaning agents for circuit boards. Unfortunately, in the atmosphere these compounds produce chlorine atoms that catalyze the decomposition of the ozone that protects the earth from ultraviolet radiation. Two of these compounds have the following mass percentages.

Determine the empirical formulas of these compounds. (Type your answer using the format CO2 for CO₂.)
empirical formula for compound I
Your answer is correct.

empirical formula for compound II
Your answer is correct.

Explain how they obey the law of multiple proportions.

3. 0/3 points All Submissions Notes Question: ZumChemP5 4.AE.074.

Question part

Points

Submissions

1	2	3
0/1	0/1	0/1
4/50	1/50	1/50

Total

0/3

A mixture contains only NaCl and Fe(NO₃)₃. A 0.521 g sample of the mixture is dissolved in water, and an excess of NaOH is added, producing a precipitate of Fe(OH)₃. The precipitate is filtered, dried, and weighed. Its mass is 0.151 g. Calculate the following.

(a) the mass of iron in the sample
Enter a number with the correct number of significant figures.
1 g
(b) the mass of Fe(NO₃)₃ in the sample
Enter a number with the correct number of significant figures.
2 g
(c) the mass percent of Fe(NO₃)₃ in the sample
Enter a number with the correct number of significant figures.
3%

4. –/2 points Notes Question: ZumChemP5 12.CP.132.

Question part

Points

Submissions

1	2
0/1	0/1
0/50	0/50

Total

0/2

An atom of a particular element is traveling at 1% of the speed of light. The de Broglie wavelength is found to be 3.40

10^-3 pm. Which element is this?

Give the molecular mass, to support your answer.

WebAssign will check your answer for the correct number of significant figures.

g/mol

5. –/3 points Notes Question: ZumChemP5 22.E.030.

Question part

Points

Submissions

1	2	3
0/1	0/1	0/1
0/50	0/50	0/50

Total

0/3

WebAssign

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Zumdahl - Chemical Principles 5/e (Homework)

Current Score: 17/25