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

Chris Read

Prentice Hall, section 1, Fall 2011

Instructor: Mr. Prentice Hall

Current Score : 0 / 24

Due : Monday, August 22, 2011 07:45 PM EDT

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  • 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 points Notes Question: BLB11 1.P.061.
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What type of quantity (for example, length, volume, density) do the following units indicate?
(a) mL
(b) cm2
(c) mm3
(d) mg/L
(e) ps
(f) nm
(g) K
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2. –/3 points Notes Question: BLB11 3.P.064.
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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 1.50 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.
 mol

(b) How many grams of O2 are needed to burn 2.10 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.
 g

(c) Octane has a density of 0.692 g/mL at 20°C. How many grams of O2 are required to burn 1.45 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.
 g

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3. –/6 points Notes Question: BLB11 4.P.018.
Question part
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Methanol, CH3OH, is a nonelectrolyte; boric acid, H3BO3, is a weak electrolyte; and magnesium iodide, MgI2, is a strong electrolyte. What are the solute particles present in aqueous solutions of each compound? (Select all that apply.)
methanol boric acid magnesium iodide





If 0.1 mol of each compound is dissolved in solution, which one contains 0.3 mol of solute particles, which contains 0.1 mol of solute particles, and which contains somewhere between 0.1 and 0.3 mol of solute particles?
0.3 mol solute particles
0.1 mol solute particles
between 0.1 and 0.3 mol solute particles
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4. –/6 points Notes Question: BLB11 8.P.018.
Question part
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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) Te2-
Answer is case sensitive.


(b) Fe3+
Answer is case sensitive.


(c) Se2-
Answer is case sensitive.


(d) Rh3+
Answer is case sensitive.


(e) Zn2+
Answer is case sensitive.


(f) Sn2+
Answer is case sensitive.

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5. –/2 points Notes Question: BLB11 21.P.024.
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Which of the following nuclides would you expect to be radioactive? (Select all that apply.)


Justify your choices.

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