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Brown, LeMay, Bursten - Chemistry 11/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2011

Instructor: Dr. Friendly

Current Score : 16 / 24

Due : Thursday, August 25, 2011 07:45 EDT

Print Assignment
Question
Points
1 2 3 4 5
7 1/3 6 0/6 2
Total
16/24 (66.7%)

  • Description

    Here are some textbook questions from Chemistry: The Central Science 11/e by Theodore E. Brown, H. Eugene LeMay, H. Eugene LeMay, Bruce E. Bursten, Catherine Murphy, and Patrick Woodward 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.

Assignment Submission

For this assignment, the number of submissions for each answer box is counted independently. The number of submissions remaining changes only if you submit a new or changed answer.

1. 7/7 points All Submissions Notes Question: BLB11 1.P.061.
Question part
Points
Submissions
1 2 3 4 5 6 7
1 1 1 1 1 1 1
1/50 3/50 3/50 3/50 3/50 3/50 1/50
Total
7/7
 
What type of quantity (for example, length, volume, density) do the following units indicate?
(a) mL
Your answer is correct.		 (b) cm2
Your answer is correct.		 (c) mm3
Your answer is correct.
(d) mg/L
Your answer is correct.		 (e) ps
Your answer is correct.		 (f) nm
Your answer is correct.
(g) K
Your answer is correct.
Your work in question(s) will also be submitted or saved.
2. 1/3 points All Submissions Notes Question: BLB11 3.P.064.
Question part
Points
Submissions
1 2 3
1 0/1 0/1
2/50 1/50 1/50
Total
1/3
 
The complete combustion of octane, C8H18, the main component of gasoline, proceeds as shown below.
2 C8H18(l) + 25 O2(g) → 16 CO2(g) + 18 H2O(l)
(a) How many moles of O2 are needed to burn 2.10 mol of C8H18?
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
Your answer is correct. mol

(b) How many grams of O2 are needed to burn 2.70 g of C8H18?
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
Your answer is incorrect. g

(c) Octane has a density of 0.692 g/mL at 20°C. How many grams of O2 are required to burn 7.45 gal of C8H18?
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
Your answer is incorrect. g

Your work in question(s) will also be submitted or saved.
3. 6/6 points All Submissions Notes Question: BLB11 4.P.018.
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
 
Sucrose, C12H22O11, is a nonelectrolyte; hypochlorous acid, HClO, is a weak electrolyte; and ammonium chloride, NH4Cl, is a strong electrolyte. What are the solute particles present in aqueous solutions of each compound? (Select all that apply.)
sucrose hypochlorous acid ammonium chloride
Your answer is correct.
Your answer is correct.
Your answer is correct.
If 0.1 mol of each compound is dissolved in solution, which one contains 0.2 mol of solute particles, which contains 0.1 mol of solute particles, and which contains somewhere between 0.1 and 0.2 mol of solute particles?
0.2 mol solute particles Your answer is correct.
0.1 mol solute particles Your answer is correct.
between 0.1 and 0.2 mol solute particles Your answer is correct.
Your work in question(s) will also be submitted or saved.
4. –/6 points Notes Question: BLB11 8.P.018.
Question part
Points
Submissions
1 2 3 4 5 6
0/1 0/1 0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50 0/50 0/50
Total
0/6
 
Write electron configurations for the following ions, and determine which have noble-gas configurations. (Type your answer using the format [Ar] 4s2 3d10 4p2 for [Ar]4s23d104p2. If the configuration is a noble gas, enter the noble gas in brackets, for example [Ne] for F ‾.)
(a) Ag+
Answer is case sensitive.


(b) Se3+
Answer is case sensitive.


(c) Zn2+
Answer is case sensitive.


(d) Pb2+
Answer is case sensitive.


(e) Fe3+
Answer is case sensitive.


(f) Tl+
Answer is case sensitive.

Your work in question(s) will also be submitted or saved.
5. 2/2 points All Submissions Notes Question: BLB11 21.P.024.
Question part
Points
Submissions
1 2
1 1
2/50 1/50
Total
2/2
 
Which of the following nuclides would you expect to be radioactive? (Select all that apply.)
Your answer is correct.


Justify your choices.

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