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Laird - University Chemistry 1/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 0/10

Due: Wednesday, October 27, 2010 08:00 EDT

About this Assignment

Question
Points
1 2 3 4 5
0/5 0/2 0/1 0/1 0/1
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0/10

Description

University Chemistry 1/e by Laird 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.

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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 testbank question.


Instructions

This demo assignment allows many submissions and allows you to try another version of the same question for practice.



1. –/5 points Notes Question: LairdUChem1 0.Animation.01.
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Limiting Reactant Use the animation to answer the following questions.
(a) In the animation reaction, if 4 NO and 4 O2 are mixed, how many molecules of the product form?
molecules

(b) When 6 NO and 3 O2 are used in the reaction in the animation, the limiting reactant is:
    



(c) The opening of the valve between the two bulbs determines:
    


This animation will begin with a narration when you click "Open in New Window" below. To restart the narration, click "Open in New Window" again.
(d) If there is excess oxygen present in the reaction, this can be seen in the animation by the presence of:
    



(e) Which of the following characterizes the reaction shown in the animation which utilizes the 6 NO to 2 O2 mole ratio?
    


2. –/2 points Notes Question: LairdUChem1 0.PracticeEx.17.
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Practice Exercise 0.17 about this problem
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 0.454 mole of O2?
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 moles
(b) How many grams of NO2 are formed by the complete reaction of 3.14 g of NO?
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 grams
HINTS
I'm Stuck


3. –/1 points Notes Question: LairdUChem1 0.EOCP.055.
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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.
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 moles

4. –/1 points Notes Question: LairdUChem1 3.Supp.7-09.
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Which of the following chemical equations is NOT balanced?
    



5. –/1 points Notes Question: LairdUChem1 3.TB.006.
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The mass of 1.21 1020 atoms of sulfur is
    


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