WebAssign

Saturday, November 21, 2009 04:46 EST

Logged in as demo@demo

Logout

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

James Finch

Chemistry - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 10/13

Due: Sunday, September 5, 2010 07:00 EDT

About this Assignment

Question
Points
1 2 3 4 5 6
3 5 0/1 1 0/2 1
Total
10/13

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. 3/3 points All Submissions Notes Question: ChangE5 1.EOCP.029.
Question part
Points
Submissions
1 2 3
1 1 1
11/50 1/50 2/50
Total
3/3
 
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) 5.6805 m + 0.6 m + 4.25 m
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
Your answer is correct. m

(b) 3.75 g - 2.9125 g
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
Your answer is correct. g

(c) 4.58 cm 3.6660 cm
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
Your answer is correct. cm2


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

Your answer is correct.



(b) Inside the cathode ray tube the:
    

Your answer is correct.



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

Your answer is correct.



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

Your answer is correct.



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

Your answer is correct.


3. 0/1 points All Submissions Notes Question: ChangE5 3.PracticeEx.01.
Question part
Points
Submissions
1
0/1
5/50
Total
0/1
 
Practice Exercise 3.1 about this problem
The atomic masses of the two stable isotopes of chlorine, 3517Cl (75.78 percent) and 3717Cl (24.22 percent), are 34.9689 amu and 36.9659 amu, respectively. Calculate the average atomic mass of chlorine.
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
Your answer is incorrect.
Your answer differs from the correct answer by 10% to 100%. amu
HINTS
I'm Stuck


4. 1/1 points All Submissions Notes Question: ChangE5 3.PracticeEx.06.
Question part
Points
Submissions
1
1
3/50
Total
1/1
 
Practice Exercise 3.6 about this problem
Calculate the number of moles of chloroform (CHCl3) in 237 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.
Your answer is correct. 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 1.45 103 g of V2O5 react with 2.06 103 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 803 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. 1/1 points All Submissions Notes Question: ChangE5 4.TB.041.
Question part
Points
Submissions
1
1
2/50
Total
1/1
 
Which one of the following is a redox reaction?
    

Your answer is correct.


Home My Assignments