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Midterm Exam
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Comment: Thanks for your submission. Please carefully review the questions you got wrong and let me
know what still puzzles you so I can help explain it.
Part 1 of 4 - Short Answer
13.0/ 15.0 Points
Please show as much work as possible for full credit.
Question 1 of 13
3.0/ 5.0 Points
`IN YOUR OWN WORDS, who was John Dalton, and why is he so important to chemistry? What did
he "discover" that is so central to our study of chemistry? Explain why it is important.

Feedback: See section 1.4

Comment: Need to explain the atomic theory in more
detail
Question 2 of 13
5.0/ 5.0 Points
`The density of my own home brew beer is around 1.050 grams per cubic centimeter. If I poured myself
3 ice cold foamy glasses that had a total mass of 1.220 kg, what is the volume of beer I would be
consuming (
in liters
)?

Feedback: See section 2.9
Comment: Correct
Question 3 of 13
5.0/ 5.0 Points
My friend recently went to Comic-Con and purchased a Power Ring (like Green Lantern's ring) that he
swears is the real thing. A real Power Ring, according to DC comics, is supposedly made of an element
called Oaite from the planet Oa. I, of course, am skeptical of his purchase. So, we take the ring's mass
and find it to be 76.986 g. Then, we drop it into a graduated cylinder and find that it displaces 0.004555
L. Assume the following density values are true: Oaite = 16.901 g/cm^3; Gold = 20.282 g/cm^3; Nickel
= 9.912 g/cm^3; Platinum = 20.460 g/cm^3; Silver = 11.501 g/cm^3; Titanium = 4.500 g/cm^3;
Chromium = 7.150 g/cm^3. So what have we discovered?
All work must be
shown
,
labeled
, and
explained
in detail to receive credit. Note that where applicable,
superscripts (X
2
) can be written as X^2 and subscripts (X
2
) can be written as X_2 if it saves you time.
Convert liters into cubic cm.
0.004555L x cm^3/1L= 4.555cm^3
Then substitute values into formula
D= 76.986g/ 4.555cm^3= 16.90g/cm^3
The friend has Oaite