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Chang - Chemistry 9/e (Homework)

Chris Read

McGraw-Hill, section 1, Fall 2011

Instructor: Dr. Friendly

Current Score : 0 / 15

Due : Wednesday, September 7, 2011 07:00 AM EDT

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  • Description

    Chemistry 9/e by Raymond Chang published by McGraw-Hill Higher Education now has animations with conceptual questions and tutorial problems offering feedback and hints to guide student content mastery, as well as over 1150 end-of-chapter questions. You can check out a sampling of this exciting development below.

    Designed by teachers for teachers, WebAssign is easy to use and reliable -- a trusted companion to your teaching. Sign up for a Free Trial today!

    Click here for a list of all of the questions coded in WebAssign.

    Question 1 is an animation with an assignable quiz attached.

    Question 2 is a follow-up Practice Exercise which checks student understanding of the related Example in the textbook. Practice Exercise 13, for example, is directly related to Exercise 13.

    Question 3 and 4 are algorithmic end-of-chapter problems with conditional feedback added to the numerical answers.

    Question 5 is a supplemental multiple choice questions, with explanatory solutions. These questions provide additional coverage of topics throughout the textbook.

    Question 6 is a testbank question.

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. –/4 points Notes Question: Chang9 3.Animation.02.
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Stoichiometry Use the animation to answer the following questions.
clear dot clear dot clear dot
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(a) In the reaction of H2 with O2, if the maximum grams of O2 are used:
    


(b) In the reaction of H2 with O2, if 6 moles of H2 molecules are used:
    


(c) When H2 reacts with I2, as the number of moles of product increases:
    


(d) In the reaction producing HI, if 768 grams of HI form:
    


(e) Consider the reaction: H + H H2. This is the only reaction in the animation in which:
    

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2. –/2 points Notes Question: Chang9 3.PracticeEx.13.
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about this problemPractice Exercise 3.13
The reaction between nitric oxide (NO) and oxygen to form nitrogen dioxide (NO2) is a key step in photochemical smog formation.
2 NO(g) + O2(g) 2 NO2(g)
(a) How many moles of NO2 are formed by the complete reaction of 0.184 mole of O2?
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 moles

(b) How many grams of NO2 are formed by the complete reaction of 2.24 g of NO?
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 grams
HINTS
I'm Stuck

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3. –/1 points Notes Question: Chang9 3.EOCP.073.
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Each copper(II) sulfate unit is associated with five water molecules in crystalline copper(II) sulfate pentahydrate (CuSO4·5 H2O). When this compound is heated in air above 100°C, it loses the water molecules and also its blue color.

CuSO4·5 H2O CuSO4 + 5 H2O

If 8.50 g of CuSO4 are left after heating 13.29 g of the blue compound, calculate the number of moles of H2O originally present in the compound.
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 moles
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4. –/6 points Notes Question: Chang9 3.EOCP.115.
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Calculate the number of cations and anions in each of the following compounds.
(a) 8.98 g of KBr
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 cations
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 anions
(b) 5.50 g of Na2SO4
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 cations
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 anions
(c) 7.60 g of Ca3(PO4)2
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 cations
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 anions

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5. –/1 points Notes Question: Chang9 3.Supp.7-09.
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Which of the following chemical equations is NOT balanced?
    

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6. –/1 points Notes Question: Chang9 3.TB.006.
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The mass of 1.21 multiplied by 1020 atoms of sulfur is
    

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