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Gilbert et al - Chemistry: Sci in Context 2009 (Homework)

Sarah Yates

W. W. Norton, section 1, Fall 2011

Instructor: Mr. Norton

Current Score : 0 / 24

Due : Thursday, December 1, 2011 07:45 PM EST

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  • Description

    Here are some textbook questions from Chemistry: The Science in Context 2009 edition by Thomas R. Gilbert, Rein V. Kirss, Natalie Foster and Geoffrey Davies published by W. W. Norton & Company. 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 wherever the problem has randomized values.

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. –/1 points Notes Question: GilChem2009 1.P.068.
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Which of the following numbers have just three significant figures? (Select all that apply.)


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2. –/12 points Notes Question: GilChem2009 2.P.035.
Question part
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0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
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How many protons, neutrons, and electrons are there in the following atoms?
Symbol 194Os 222Fr 22Ne 102Rh
Number of protons
Answer is not case sensitive.
Answer is not case sensitive.
Answer is not case sensitive.
Answer is not case sensitive.
Number of neutrons
Answer is not case sensitive.
Answer is not case sensitive.
Answer is not case sensitive.
Answer is not case sensitive.
Number of electrons
Answer is not case sensitive.
Answer is not case sensitive.
Answer is not case sensitive.
Answer is not case sensitive.

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3. –/4 points Notes Question: GilChem2009 3.P.011.
Question part
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Earth's atmosphere contains many volatile substances that are present in trace amounts. The following quantities of these trace gases were found in a 1.0 mL sample of air. Calculate the number of moles of each gas in the sample.
(a) 1.9 1014 atoms of Ne(g)
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 mol

(b) 7.2 1013 molecules of CH4(g)
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Enter a number with the correct number of significant figures.
 mol

(c) 7.7 1012 molecules of O3(g)
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 mol

(d) 4.5 109 molecules of NO2(g)
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 mol

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4. –/4 points Notes Question: GilChem2009 4.P.039.
Question part
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Rank the following solutions on the basis of their ability to conduct electricity. 1.3 M NaCl, 1.4 M KCl, 1.5 M Na2SO4, 0.64 M LiCl.
    

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5. –/3 points Notes Question: GilChem2009 9.P.068.mrv.
Question part
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1 2 3
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Draw a Lewis structure for Cl3+. Determine its molecular geometry and the hybridization of the central Cl atom. (Assign atomic charges where appropriate.)

MarvinSketch

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    chemical structure.
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molecular geometry
    


hybridization

chemPad

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