Chm 204 Expt 3 Fall 2018 Percent Copper in a Salt
You and your partner will normally submit one form together. If two forms are submitted by the same individual, the second one will be graded. If each partner submits a form, each will be graded individually. Units are required whenever they are appropriate. Significant figure mistakes can be costly. Preview the on-line questions on your cover sheet.
Enter your name and your lab partner's name. *
Threesomes: Enter all three names, but enter only two e-mail addresses below.
Your answer
Enter your lab station in the format 1A, 2B, etc. (no space between number and letter) *
Your answer
Section *
Carefully enter your complete CU e-mail address. This is how you will find out your score for this activity. *
Example: ABC99099@creighton.edu Errors will result in failure to deliver.
Your answer
Enter your partner's complete CU email address.
Enter only one e-mail address. Threesomes: Either enter a separate form for one individual or agree to forward grade to third member.
Your answer
If scientific notation is used, it must be in the only form recognized by Excel as demonstrated by this example: The number 0.000457 may be entered as such or as 4.57E-4 (Note: No speces), but NOT as 4.57 x 10^-4. See the pre-lab presentation. *
1. (2 pts) Enter the mass of your unknown sample, including units.
Report all of the decimal places obtained from the balance used.
Your answer
2. (2 pts) Enter the mass of the copper obtained, including units.
Report all of the decimal places obtained from the balance used.
Your answer
3. (5 pts) Enter the percent copper by mass, followed by the words "percent Cu".
(2 pts for calculation + 3 points for accuracy)
Your answer
4. (2 pts) Enter the molar mass of the unknown, including units.
Your answer
5. (1 pt) Based on your MM, which compound most closely matches your results?
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