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Moore, Stanitski, Jurs - Chemistry: Mol. Sci. 2/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 12.8 / 24

Due : Wednesday, November 13, 2019 08:00 EST

Last Saved : n/a Saving...  ()

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Question
Points
1 2 3 4 5
–/1 –/3 –/2 –/15 –/3
Total
12.8/24 (53.3%)

  • Instructions

    Here are some textbook questions from Chemistry: The Molecular Science 2/e by Moore, Staninski, and Jurs published by Brooks/Cole Publishing. Click here for a list of all of the questions coded in WebAssign. This demo assignment allows many submissions and allows you to try another version of the same question for practice.

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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.

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Your last submission is used for your score.

1. –/1 points MSJ2 1.Q.025. My Notes
Question Part
Points
Submissions Used
1
–/1
0/50
Total
–/1
 
Calculate the mass of the sodium chloride crystal in the photo if the dimensions of the crystal are 10. cm thick by 14 cm long by 19 cm wide. (Remember that 1 cm3 = 1 mL.)
WebAssign will check your answer for the correct number of significant figures.(No Response) seenKey

5700

 g
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2. –/3 points MSJ2 2.Q.041. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/50 0/50 0/50
Total
–/3
 
Give the mass number of each of the following atoms.
(a) beryllium with 5 neutrons
(No Response) seenKey

9
(b) zirconium with 51 neutrons
(No Response) seenKey

91
(c) silver with 61 neutrons
(No Response) seenKey

108
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3. –/2 points MSJ2 3.Q.102. My Notes
Question Part
Points
Submissions Used
1 2
–/1 –/1
0/50 0/50
Total
–/2
 
"Dilithium" is the fuel for the Starship Enterprise. However, because its density is quite low, you will need a large space to store a large mass. As an estimate for the volume required, we shall use the element lithium.
(a) If you want to have 287 mol for an interplanetary trip, what must the volume of a piece of lithium be?
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3730

 cm3
(b) If the piece of lithium is a cube, what is the dimension of an edge of the cube? (The density of lithium is 0.534 g/cm3 at 20°C.)
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15.5

 cm
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4. –/15 points MSJ2 4.Q.023. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
–/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1
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–/15
 
Complete and balance the following equations involving oxygen reacting with an element. Name the product in each case. (Type your answer using the format CO2 for CO2. Use the lowest possible coefficients.)
(a)(No Response) seenKey

2

 Mg(s)		+(No Response) seenKey

1

 O2(g)		(No Response) seenKey

2

 (No Response) seenKey

MgO

 (s)
name of product:(No Response) seenKey

Magnesium oxide
(b)(No Response) seenKey

2

 Ca(s)		+(No Response) seenKey

1

 O2(g)		(No Response) seenKey

2

 (No Response) seenKey

CaO

 (s)
name of product:(No Response) seenKey

Calcium oxide
(c)(No Response) seenKey

4

 In(s)		+(No Response) seenKey

3

 O2(g)		(No Response) seenKey

2

 (No Response) seenKey

In2O3

 (s)
name of product:(No Response) seenKey

Indium(III) oxide -or- Indium oxide
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5. –/3 points MSJ2 5.Q.059. My Notes
Question Part
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1 2 3
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–/3
 
A flask contains 0.29 M (NH4)2SO4. What ions exist in the solution? (Select all that apply.)


What are their concentrations?
NH4
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0.58

 M
SO4
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0.29

 M
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