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

James Finch

Chemistry - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 0/24

Due: Saturday, November 13, 2010 08:00 EST

About this Assignment

Question
Points
1 2 3 4 5
0/1 0/3 0/2 0/15 0/3
Total
0/24

Description

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.


Instructions

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



1. –/1 points Notes Question: MSJ2 1.Q.025.
Question part
Points
Submissions
1
0/1
0/50
Total
0/1
 
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.
Enter a number with the correct number of significant figures.
 g



2. –/3 points Notes Question: MSJ2 2.Q.041.
Question part
Points
Submissions
1 2 3
0/1 0/1 0/1
0/50 0/50 0/50
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0/3
 
Give the mass number of each of the following atoms.
(a) beryllium with 5 neutrons
Enter an exact number.

(b) zirconium with 51 neutrons
Enter an exact number.

(c) silver with 61 neutrons
Enter an exact number.


3. –/2 points Notes Question: MSJ2 3.Q.102.
Question part
Points
Submissions
1 2
0/1 0/1
0/50 0/50
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0/2
 
"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?
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 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.)
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 cm


4. –/15 points Notes Question: MSJ2 4.Q.023.
Question part
Points
Submissions
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50
Total
0/15
 
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)
Answer is not case sensitive.
 Mg(s)		+
Answer is not case sensitive.
 O2(g)
Answer is not case sensitive.
Answer is case sensitive.
(s)
name of product:
Answer is not case sensitive.
(b)
Answer is not case sensitive.
 Ca(s)		+
Answer is not case sensitive.
 O2(g)
Answer is not case sensitive.
Answer is case sensitive.
(s)
name of product:
Answer is not case sensitive.
(c)
Answer is not case sensitive.
 In(s)		+
Answer is not case sensitive.
 O2(g)
Answer is not case sensitive.
Answer is case sensitive.
(s)
name of product:
Answer is not case sensitive.


5. –/3 points Notes Question: MSJ2 5.Q.059.
Question part
Points
Submissions
1 2 3
0/1 0/1 0/1
0/50 0/50 0/50
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0/3
 
A flask contains 0.29 M (NH4)2SO4. What ions exist in the solution? (Select all that apply.)



What are their concentrations?
NH4
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 M
SO4
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 M
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