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Chang - Chemistry 9/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 8 / 15

Due : Wednesday, September 4, 2019 07:30 EDT

Last Saved : n/a Saving...  ()

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8/15 (53.3%)

  • Instructions

    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, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

Assignment Scoring

Your last submission is used for your score.

1. –/4 points Chang9 3.Animation.02. My Notes
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Stoichiometry Use the animation to answer the following questions.
(a) In the reaction of H2 with O2, if the maximum grams of O2 is 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 Chang9 3.PracticeEx.13. My Notes
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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 0.384 mole of O2?
WebAssign will check your answer for the correct number of significant figures.(No Response) moles

(b) How many grams of NO2 are formed by the complete reaction of 2.24 g of NO?
WebAssign will check your answer for the correct number of significant figures.(No Response) grams
HINTS
I'm Stuck
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3. –/1 points Chang9 3.EOCP.073. My Notes
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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 7.60 g of CuSO4 are left after heating 11.88 g of the blue compound, calculate the number of moles of H2O originally present in the compound.
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4. –/6 points Chang9 3.EOCP.115. My Notes
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Calculate the number of cations and anions in each of the following compounds.
(a) 8.56 g of KBr
WebAssign will check your answer for the correct number of significant figures.(No Response) cations
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(b) 5.50 g of Na2SO4
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WebAssign will check your answer for the correct number of significant figures.(No Response) anions
(c) 7.40 g of Ca3(PO4)2
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WebAssign will check your answer for the correct number of significant figures.(No Response) anions
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5. –/1 points Chang9 3.Supp.7-09. My Notes
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Which of the following chemical equations is NOT balanced?
    
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6. –/1 points Chang9 3.TB.006. My Notes
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The mass of 1.21 ✕ 1020 atoms of sulfur is
    
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