University of California, Irvine
CHEM 120B
mfhalo123
Chemistry 120B Exam #3 – 11/12/2020
Instructions:
o Mute your microphone on Zoom and turn on your camera.
o Ask questions using Chat during the exam.
o If the
...
University of California, Irvine
CHEM 120B
mfhalo123
Chemistry 120B Exam #3 – 11/12/2020
Instructions:
o Mute your microphone on Zoom and turn on your camera.
o Ask questions using Chat during the exam.
o If there is any evidence of cheating (either during the exam or while it is
being graded) you will receive a zero for the exam and you will be reported
to the Dean of Students in the Office of Judicial Affairs.
o Print your name on the top of Signature of this page.
o Read each problem carefully before you begin.
o Make sure you answer what the problem is asking for.
o Answer each problem clearly and legibly.
o Check your work for errors.
Always ask yourself “Does this answer make sense?”.
o Partial credit will be awarded for partial answers so always try!
o Budget your time. Move to next question if you do not know how to solve the
Current problem.
This exam consists of this cover page, 6 pages of problems, and an equation sheet. Make
sure that all 7 pages are present.
Sign your name below and include the last four digits of your CWID (student ID
number). Failure to include the last four digits of your CWID will result in an
automatic score of zero.
Your signature indicates that you have read and understand these instructions.
Signature Last 4 digits of CWID
Page # Points possible Your points
2 17
3 16
4 18
5 10
6 18
7 21
First three letters of last name
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https://www.coursehero.com/file/75157503/Chem-120B-fall-2014-Exam-3-3pdf/
Show all work. Name: _____________________________________________
Remember significant figures and units.
Li Chem 120B – Exam 3 Page 2 of 7
1. Answer the following questions about definitions of acids and bases. (17 points total)
A. Matching. Choose the item in column 2 than best matches each item in column 1.
(4 points)
1) Lewis base A) electron pair donor 1) ______
2) Arrhenius base B) produces H3O+ ions in aqueous solution 2) ______
3) Arrhenius acid C) proton acceptor 3) ______
4) Bronsted-Lowry
base D) produces OHions in aqueous solution 4) ______
B. Multiple choice. Write the correct letter answer in the box provided. (9 points)
To have solutions of HI and acetic acid (H3CCOOH) with the same pH, which one of
the following statements is true? Ka, H3CCOOH = 1.8 x 10-5
A) the concentration of each solution needs to be the same
B) the concentration of HI needs to be higher
C) the concentration of acetic acid needs to be higher
D) the solutions can never have the same pH
E) none of the above
Rank the following in order of increasing acid strength.
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