Concept Test 9

Internet Concept Test Chemistry 22
Prof. J. C. Baird
Marn-Yee Lee, Silvia Georges, Derek Cummings

Topic: Cell Electrical Potential & Fluid Mixing

A Question of Free Energy

Credits

To get credit for these problems:

Be sure to register in the form at the bottom and then submit data.

(The computer may take 10 to 20 sec. to respond.)

Click here to find out how credit works.

Up to 4 people can work together on this test.

There are 6 questions.

Transport across Cell Membranes and other Questions

Background material. Why this is important and interesting.

The Model:
Two containers are seperated by a semipermeable membrane. The first contains pure water, is colored dark blue and contains a 1M copper sulfate solution. The second contains pure water colored light blue with 0.01 copper sulfate.

First, an electrode is placed in each container and a voltmeter is attached with the positive connection on the blue container. This models a human cell with one container as the inside of the cell. After an observation of any voltage the membrane is removed.

Question 1

Please select an answer to the following questions.

The volt meter reading, V(Cu^++ 0.01M) - V(Cu^++ 1.0M), is: Reason for Answer:

Question 2

The voltmeter reading is taken in solutions having twice the original volume in one cell. The voltage measured is:

Reason for Answer:

Question 3

As the temperature of both cells is raised the voltage:

Reason for Answer:

Question 4

The Membrane is broken:
A. B.
C. D.

Reason for Answer:

Question 5

After the Membrane is broken the solution diffuses from one chamber into the other and the voltage gradually:

Reason for Answer:

Question 6

In a living cell the potassium ion concentration outside the cell is measured to be 0.004M while the potassium ion concentration inside is 0.12M. The Gibbs Free Energy, = G_outside - G_inside, would be expected to be:

Reason for Answer:

Don't forget to register before you submit the form!
Please enter only the 5-digits of your Brown ID, e.g. for SISD01234, enter 01234.

   Student #1
   Brown ID (xxxxx)   : 
   Last Name          : 
   First Name         :
   Email              :


   Student #2
   Brown ID (xxxxx)   : 
   Last Name          : 
   First Name         :
   Email              :


   Student #3
   Brown ID (xxxxx)   : 
   Last Name          : 
   First Name         :
   Email              :


   Student #4
   Brown ID (xxxxx)   : 
   Last Name          : 
   First Name         :
   Email              :

Return Home

Back to Chemistry 22 HomePage