Whitten, Davis, Peck - General Chemistry 7/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 2/18

Due: Saturday, March 26, 2011 08:00 EDT

Question

Points

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

Total

2/18

Description

Here are some textbook questions from General Chemistry 7/e by Whitten, Davis, and Peck published by Brooks/Cole Publishing. 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. 0/4 points All Submissions Notes Question: WDP7 1.E.053.

Question part

Points

Submissions

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

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0/4

Liquefied gases have boiling points well below room temperature. On the Kelvin scale the boiling points of the following gases are: He, 4.2 K; N₂, 77.4 K. Convert these temperatures to the Celcius and the Fahrenheit scales.
He

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

°C

°F
N₂

°C

°F

2. –/5 points Notes Question: WDP7 2.E.021.

Question part

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Submissions

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

Convert each of the following into a correct formula represented with correct notation. (Type your answer using the format CO2 for CO₂ and Cu(OH)2 for Cu(OH)₂.)

(a) ZnOH
Answer is case sensitive.
1
(b) (NH₄)²SO₄
Answer is case sensitive.
2
(c) Na₂OH
Answer is case sensitive.
3
(d) Zn(CO₃)₂
Answer is case sensitive.
4
(e) AlOH₃
Answer is case sensitive.
5

3. 2/2 points All Submissions Notes Question: WDP7 3.E.097.

Question part

Points

Submissions

1	2
1	1
7/50	2/50

Total

2/2

Ammonia is formed in a direct reaction of nitrogen and hydrogen.

N₂(g) + 3 H₂(g) 2 NH₃(g)

A tiny portion of the starting mixture is represented by the diagram, where the blue spheres represent N and the white shperes represent H. Which of the following represents the product mixture?

figure number
Your answer is correct.

For the reaction of the given sample, which of the following is true?

N₂ is the limiting reactant. H₂ is the limiting reactant. NH₃ is the limiting reactant. No reaction is limiting; they are present in the correct stoichiometric ratio.

Your answer is correct.

4. –/3 points Notes Question: WDP7 8.E.073.

Question part

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Submissions

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

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0/3

The skeleton and a ball-and-stick model for the nitrous acid molecule, HNO₂, are shown here.

Draw the Lewis formula. (Do this on paper. Your instructor may ask you to turn in this work.)

What are the hybridizations at the middle O and N atoms? (Type your answer using the format sp3d for sp³d.)
O

N

5. –/4 points Notes Question: WDP7 16.E.021.

Question part

Points

Submissions

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

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0/4

Rate data were collected for the following reaction at a particular temperature.

A + B products

Expt.	[A]₀ (mol/L)	[B]₀ (mol/L)	Initial Rate of Reaction

1	0.10	0.10	0.0090 Ms^-1
2	0.20	0.10	0.036 Ms^-1
3	0.10	0.20	0.018 Ms^-1
4	0.10	0.30	0.027 Ms^-1

(a) What is the rate-law expression for this reaction? (X² is represented by X2 in the pulldown menu.)
Enter a number with the correct number of significant figures.
1 M^{Enter a number.

2}s^-1 3

(b) Select the correct description of the order of the reaction with respect to each reactant and to the overall order.
4
first order in [A] second order in [A] third order in [A] first order in [B] second order in [B] second order overall third order overall fourth order overall

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Whitten, Davis, Peck - General Chemistry 7/e (Homework)

Current Score: 2/18