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Silberberg - Chemistry: Matter and Change 6/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 23.8 / 30

Due : Wednesday, January 15, 2020 06:30 EST

Last Saved : n/a Saving...  ()

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23.8/30 (79.3%)

  • Instructions

    Chemistry: The Molecular Nature of Matter and Change 6/e by Martin Silberberg 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.

    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 Problem which checks student understanding of the related Sample Problem in the textbook. Follow-up Problem 3.12, for example, is directly related to Sample Problem 3.12.

    Question 3 through 7 are algorithmic end-of-chapter problems with conditional feedback added to the numerical answers and full algorithmic solutions.

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. –/5 points Silber6 10.Animation.01. My Notes
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Formal Charge Calculation Use the animation to answer the following questions.
(a) For the upper oxygen bond in the example, the oxygen has:
    

(b) How many valence electrons are assigned to the N atom in the example?
    

(c) In the animation, N has:
    

(d) The two oxygen atoms on the left and right in the figure are not characterized by having:
    

(e) The formal charge assignments are checked to be correct in the example because the sum of the formal charges is:
    
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2. –/8 points Silber6 3.FollowUp.12. My Notes
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FOLLOW-UP PROBLEM 3.12 Calculating Amounts of Products in a Limiting-Reactant Problem about this problem
B2 (red spheres) reacts with AB as shown below.
(a) Write a balanced equation for the reaction. (Type your answer using the format (NH4)2CO3 for (NH4)2CO3. Use the lowest possible coefficients.)
(No Response) B2 + (No Response) (No Response) (No Response) (No Response)

(b) Determine the limiting reactant.
(No Response)

(c) How many moles of product can be formed from the reaction of 1.8 mol of each reactant? (Assume the given moles of B2 with extra AB and then the given moles of AB with extra B2 in two separate reaction mixtures.)
B2
WebAssign will check your answer for the correct number of significant figures.(No Response) mol
AB
WebAssign will check your answer for the correct number of significant figures.(No Response) mol

HINTS
Getting Started
I'm Stuck
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3. –/4 points Silber6 3.EOCP.007. My Notes
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Each of the following balances weighs the indicated numbers of atoms of two elements.
(a) Which element has the higher molar mass?
    

(b) Which element has fewer atoms per gram?
    

(c) Which element has fewer atoms per gram?
    

(d) Which element has fewer atoms per mole?
    

Supporting Materials

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4. –/5 points Silber6 3.EOCP.097. My Notes
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Six different aqueous solutions (with solvent molecules omitted for clarity) are represented in the beakers below, and their total volumes are noted.
(a) Which solution has the highest molarity?
(No Response)

(b) Which solutions have the same molarity as solution F? (Select all that apply.)

(c) If you mix solutions A and C, does the resulting solution have a higher, a lower, or the same molarity as solution B?
    

(d) After 50. mL of water is added to solution D, is its molarity higher, lower, or the same as the molarity of solution F after 75 mL is added to it?
    

(e) How much solvent must be evaporated from solution E for it to have the same molarity as solution B?
(No Response) mL

Supporting Materials

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5. –/4 points Silber6 6.EOCP.052. My Notes
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Consider the following balanced thermochemical equation, a reaction sometimes used for H2S production.
1
8
 S8(s) + H2(g) → H2S(g)    ΔH = −20.2 kJ
(a) Is this an exothermic or endothermic reaction?
    

(b) What is ΔH for the reverse reaction?
ΔH = WebAssign will check your answer for the correct number of significant figures.(No Response) kJ

(c) What is ΔH when 1.6 mol of S8 reacts?
ΔH = WebAssign will check your answer for the correct number of significant figures.(No Response) kJ

(d) What is ΔH when 15.2 g of S8 reacts?
ΔH = WebAssign will check your answer for the correct number of significant figures.(No Response) kJ

Supporting Materials

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6. –/2 points Silber6 13.EOCP.145. My Notes
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A florist prepares a solution of nitrogen-phosphorus fertilizer by dissolving 5.64 g of NH4NO3 and 4.59 g of (NH4)3PO4 in enough water to make 26.0 L of solution. What are the molarities of NH4+ and PO43− in the solution?
NH4+     WebAssign will check your answer for the correct number of significant figures.(No Response) M
PO43−     WebAssign will check your answer for the correct number of significant figures.(No Response) M

Supporting Materials

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7. –/2 points Silber6 14.EOCP.006. My Notes
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Complete and balance the following equations. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer.)
(a) Reduction by hydrogen to form a metal,
PdCl2(aq) + H2(g) →

chemPad

Help

 

(b) A saltlike (alkali metal) hydride reacting with water,
LiH(s) + H2O(l) →

chemPad

Help

 

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