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Brown, Lemay, Bursten - Chemistry 8/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 9/17

Due: Wednesday, August 25, 2010 08:30 EDT

About this Assignment

Question

Points

1	2	3	4	5
3	0/5	6	0/2	0/1

Total

9/17

Description

Here are some textbook questions from Chemistry: The Central Science 8/e by Brown, Lemay, and Bursten published by Prentice Hall. 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. 3/3 points All Submissions Notes Question: BLB8 1.P.015.

Question part

Points

Submissions

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

Total

3/3

Label each of the following as either a physical process or a chemical process.

(a) pulverizing aspirin
1
physical chemical

(b) plants using carbon dioxide from the air to make sugar
2
chemical physical

(c) explosion of nitroglycerin
3
chemical physical

2. –/5 points Notes Question: BLB8 3.P.020.

Question part

Points

Submissions

1	2	3	4	5
0/1	0/1	0/1	0/1	0/1
0/50	0/50	0/50	0/50	0/50

Total

0/5

Determine the formula weights (to 1 decimal place) for each of the following compounds.

(a) Isopentyl acetate, CH₃CO₂C₅H₁₁, responsible for the odor of bananas.
Enter a number with the correct number of significant figures.
1 amu
(b) sucrose, C₁₂H₂₂O₁₁, table sugar
Enter a number with the correct number of significant figures.
2 amu
(c) Benzoic acid, C₇H₆O₂, a substance used as a food preservative.
Enter a number with the correct number of significant figures.
3 amu
(d) sodium chloride, NaCl, table salt
Enter a number with the correct number of significant figures.
4 amu
(e) Urea, (NH₂)₂CO, a compound used as a nitrogen fertilizer.
Enter a number with the correct number of significant figures.
5 amu

3. 6/6 points All Submissions Notes Question: BLB8 4.P.038.

Question part

Points

Submissions

1	2	3	4	5	6
1	1	1	1	1	1
1/50	1/50	1/50	1/50	1/50	1/50

Total

6/6

Determine the oxidation number for the indicated element in each of the following compounds.

(a) Co in CoCl₂
Answer is not case sensitive.
1
(b) Ga in Ga(OH)₂
Answer is not case sensitive.
2
(c) S in HSO₃^-
Answer is not case sensitive.
3
(d) C in C₂O₄^2-
Answer is not case sensitive.
4
(e) Cr in Cr(OH)₄^-
Answer is not case sensitive.
5
(f) Mn in KMnO₄
Answer is not case sensitive.
6

4. –/2 points Notes Question: BLB8 5.P.034.

Question part

Points

Submissions

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

Total

0/2

A gas is confined to a cylinder under constant atmospheric pressure, as illustrated in Figure 5.3. When 460. J of heat is added to the gas, it expands and does 95 J of work on the surroundings.
What is the value of

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

J
Find

E for this process.

Figure 5.3.

5. –/1 points Notes Question: BLB8 10.P.084.

Question part

Points

Submissions

1
0/1
0/50

Total

0/1

Consider the arrangement of bulbs shown in Figure 10.32. Each of the bulbs contains a volume of gas as shown. P_N₂ = 675 torr, P_Ne = 216 torr, and P_H₂ = 440. torr. What is the pressure of the system when all the stopcocks are opened, assuming that the temperature remains constant? (We can neglect the volume of the capillary tubing connecting the bulbs.)

torr

Figure 10.32.

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