WebAssign

Saturday, November 21, 2009 04:57 EST

Logged in as demo@demo

Logout

Shultz - Chemistry for Engineers (Homework)

James Finch

Chemistry - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 0/22

Due: Wednesday, January 12, 2011 08:00 EST

About this Assignment

Question
Points
1 2 3 4 5
0/4 0/5 0/4 0/5 0/4
Total
0/22

Description

Here are some textbook questions from Chemistry for Engineers 7/e by Mary Jane Shultz published by Brooks/Cole. Click here for a list of all of the questions coded in WebAssign.


Instructions

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



1. –/4 points Notes Question: ShultzCE07 1.E.096.
Question part
Points
Submissions
1 2 3 4
0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50
Total
0/4
 
The mass of a 300. mL beaker is 188 g when empty. Determine its mass when filled with the following substances.
(a) water (density 0.9970 g/cm3 at 20°C)
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 g
(b) alcohol (density 0.7893 g/cm3 at 20°C)
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 g
(c) mercury (density 13.546 g/cm3 at 20°C)
WebAssign will check your answer for the correct number of significant figures.
Enter a number with the correct number of significant figures.
 g
(d) Explain why mercury-containing pollutants are usually found in the mud at the bottom of a lake of stream.
    



2. –/5 points Notes Question: ShultzCE07 2.E.092.
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
 
Calculate the effective nuclear charges for these five elements: Cu, Al, Fe, K, Ti.
Cu
Enter a number.

Al
Enter a number.

Fe
Enter a number.

K
Enter a number.

Ti
Enter a number.


3. –/4 points Notes Question: ShultzCE07 3.E.028.
Question part
Points
Submissions
1 2 3 4
0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50
Total
0/4
 
Predict the molecular formula for the compound formed from the following pairs of elements. (Type your answer using the format CO2 for CO2.)
(a) Mg and O
Answer is case sensitive.

(b) Br and Cl
Answer is case sensitive.

(c) Al and O
Answer is case sensitive.

(d) H and F
Answer is case sensitive.


4. –/5 points Notes Question: ShultzCE07 6.E.046.
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
 
Caffeine is the stimulant found in coffee, tea, and many soft drinks. The structure of caffeine is shown here. Identify all sp2 hybridized atoms in caffeine. (Select all that apply.)

Caffeine

number of ring C atoms
Answer is not case sensitive.

number of ring N atoms
Answer is not case sensitive.

number of non-ring C atoms
Answer is not case sensitive.

number of O atoms
Answer is not case sensitive.


5. –/4 points Notes Question: ShultzCE07 7.E.022.
Question part
Points
Submissions
1 2 3 4
0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50
Total
0/4
 
Determine which fuel, methane or propane, produces more heat per gram.
    


methane
Enter a number.
 kJ/g
propane
Enter a number.
 kJ/g
Explain why.

Home My Assignments