WebAssign

Tuesday, February 9, 2010 10:53 AM EST

Logged in as mcgraw@mcgraw

Logout

Chang - General Chemistry: Essential Concepts 5/e (Homework)

Chris Read

McGraw-Hill, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score : 0 / 13

Due : Sunday, September 12, 2010 07:00 AM EDT

About this Assignment

Question
Points
1 2 3 4 5 6
0/3 0/5 0/1 0/1 0/2 0/1
Total
0/13

Description

General Chemistry: The Essential Concepts 5/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 algorithmic end-of-chapter problem with conditional feedback added to the numerical answers.

Question 2 is an animation with an assignable quiz attached.

Question 3, 4, and 5 are follow-up Practice Exercises which check student understanding of the related Example in the textbook. 3.PracticeEx.01, for example, is directly related to Exercise 3.1.

Question 6 is an end-of-chapter problem which has been converted into a multple choice format.


Instructions

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



1. –/3 points Notes Question: ChangE5 1.EOCP.029.
Question part
Points
Submissions
1 2 3
0/1 0/1 0/1
0/50 0/50 0/50
Total
0/3
 
Carry out these operations as if they were calculations of experimental results, and express each answer in the correct units and with the correct number of significant figures.
(a) 5.6794 m + 0.2 m + 4.42 m
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 m

(b) 3.79 g - 2.9127 g
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 g

(c) 4.44 cm 3.6673 cm
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 cm2


2. –/5 points Notes Question: ChangE5 2.Animation.01.
Question part
Points
Submissions
1 2 3 4 5
0/1 0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50 0/50
Total
0/5
 
Charge to Mass Ratio of the Electron Use the animation to answer the following questions.
(a) The cathode ray tube used by Thomson:
    



(b) Inside the cathode ray tube the:
    



(c) When an electric field is applied, the ray is attracted to the:
    



(d) When the magnet is placed near the tube with the north pole pointing upward, the ray is:
    



(e) In the equation used to calculate the mass to charge ratio of the electron which of the following variables is not needed?
    



3. –/1 points Notes Question: ChangE5 3.PracticeEx.01.
Question part
Points
Submissions
1
0/1
0/50
Total
0/1
 
Practice Exercise 3.1 about this problem
The atomic masses of the two stable isotopes of carbon, 126C ( 98.90 percent) and 136C (1.100 percent), are 12.0000 amu and 13.0034 amu, respectively. Calculate the average atomic mass of carbon.
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 amu
HINTS
I'm Stuck


4. –/1 points Notes Question: ChangE5 3.PracticeEx.06.
Question part
Points
Submissions
1
0/1
0/50
Total
0/1
 
Practice Exercise 3.6 about this problem
Calculate the number of moles of chloroform (CHCl3) in 197 g of chloroform.
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 moles
HINTS
I'm Stuck


5. –/2 points Notes Question: ChangE5 3.PracticeEx.16.
Question part
Points
Submissions
1 2
0/1 0/1
0/50 0/50
Total
0/2
 
Practice Exercise 3.16 about this problem
Industrially, vanadium metal, which is used in steel alloys, can be obtained by reacting vanadium(V) oxide with calcium at high temperatures.

5 Ca + V2O5 5 CaO + 2 V

In one process 1.65 103 g of V2O5 react with 1.91 103 g of Ca.
(a) Calculate the theoretical yield of V.
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 g
(b) Calculate the percent yield if 781 g of V are obtained.
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
%
HINTS
Getting Started
I'm Stuck


6. –/1 points Notes Question: ChangE5 4.TB.041.
Question part
Points
Submissions
1
0/1
0/50
Total
0/1
 
Which one of the following is a redox reaction?
    


Home My Assignments