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Ebbing and Gammon - General Chemistry 9/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 15 / 20

Due : Monday, September 9, 2019 07:30 EDT

Last Saved : n/a Saving...  ()

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Question
Points
1 2 3 4 5 6 7 8
–/4 –/4 –/1 –/3 –/4 –/2 –/1 –/1
Total
15/20 (75.0%)

  • Instructions

    General Chemistry 9th Edition by Darrell D. Ebbing and Steven D. Gammon includes more than 1390 end-of-chapter problems plus ChemWork assignments and Thinkwell® lecture videos. Questions provide links to Practice It exercises, Watch It videos, relevant textbook pages, and online, live help.

    Questions 1-8 are end-of-chapter problems enhanced with links to Read It, Watch It, Practice It, and Chat About It buttons.

    Read It - Relevant textbook pages

    Watch It - Watch Its include 5 to 7 minute mini-lectures from Thinkwell®.

    Practice It - Practice Its include Visual Exercises that combine molecular-level animations and videos demonstrations that cover core chemistry concepts. Each animation or video is accompanied by questions to aid students in conceptualization of the topic.

    Chat About It - Online, live help
    This demo assignment allows many submissions and allows you to try another version of the same question for practice.

Assignment Submission

For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

Assignment Scoring

Your last submission is used for your score.

1. –/4 points EbGam9 1.PP.061. My Notes
Question Part
Points
Submissions Used
1 2 3 4
–/1 –/1 –/1 –/1
0/50 0/50 0/50 0/50
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–/4
 
Do the indicated arithmetic and give the answer to the correct number of significant figures.
(a) (8.79 text( x ) 0.0310)/0.030
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9.1

(b) 0.72 + 91.6
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92.3

(c) 932 ✕ 0.00449 + 129
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133

(d) (847.86 - 847.68) ✕ 14658
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2600

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2. –/4 points EbGam9 2.PP.084. My Notes
Question Part
Points
Submissions Used
1 2 3 4
–/1 –/1 –/1 –/1
0/50 0/50 0/50 0/50
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–/4
 
Give systematic names to the following binary compounds.
(a) N2F2
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dinitrogen difluoride

(b) As4O6
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tetrarsenic hexoxide -or- tetraarsenic hexaoxide

(c) ClO2
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chlorine dioxide

(d) N2O4
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dinitrogen tetroxide -or- dinitrogen tetraoxide

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3. –/1 points EbGam9 3.PP.088. My Notes
Question Part
Points
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1
–/1
0/50
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–/1
 
Using the following reaction (depicted using molecular models), large quantities of ammonia are burned in the presence of a platinum catalyst to give nitric oxide, as the first step in the preparation of nitric acid.
Suppose a vessel contains 5.4 g of NH3, how many grams of O2 are needed for a complete reaction?
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13

 g

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4. –/3 points EbGam9 3.PP.093. My Notes
Question Part
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1 2 3
–/1 –/1 –/1
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–/3
 
Methanol, CH3OH, is prepared industrially from the gas-phase catalytic balanced reaction that has been depicted here using molecular models.
In a laboratory test, a reaction vessel was filled with 31.7 g CO and 10.7 g H2.
(a) How many grams of methanol would be produced in a complete reaction?
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36.3

 g
(b) Which reactant remains unconsumed at the end of the reaction?
    


(c) How many grams of it remain?
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6.1

 g

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5. –/4 points EbGam9 4.PP.056. My Notes
Question Part
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1 2 3 4
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–/4
 
Obtain the oxidation number for the element noted in each of the following. (Type your answer using the format 2 or -1.)
(a) Cl in HClO4
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7 -or- +7 -or- 7+

(b) Cr in CrO3
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6 -or- +6 -or- 6+

(c) O in CaO
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-2 -or- 2-

(d) Hg in Hg2Cl2
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1 -or- +1 -or- 1+

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6. –/2 points EbGam9 4.PP.083. My Notes
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1 2
–/1 –/1
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–/2
 
A chemist added an excess of sodium sulfate to a solution of a soluble barium compound to precipitate all of the barium ion as barium sulfate, BaSO4. How many grams of barium ion are in a 513-mg sample of the barium compound if a solution of the sample gave 539 mg BaSO4 precipitate?
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0.317

 g
What is the mass percentage of barium in the compound?
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61.8

 %

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7. –/1 points EbGam9 5.PP.037. My Notes
Question Part
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1
–/1
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–/1
 
A gas in a closed-tube manometer (shown below) has a measured pressure of 0.057 atm. Calculate the pressure in mmHg.
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43

 mmHg

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8. –/1 points EbGam9 5.PP.087. My Notes
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1
–/1
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–/1
 
Formic acid, HCHO2, is a convenient source of small quantities of carbon monoxide. When warmed with sulfuric acid, formic acid decomposes to give CO gas.

HCHO2(l) → H2O(l) + CO(g)

If 3.27 L of carbon monoxide was collected over water at 25.0°C and 633 mmHg, how many grams of formic acid were consumed?
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4.93

 g

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