CHEM 121 Final Exam Questions and Answers- Portage Learning/CHEM 121 Final Exam Questions and Answers- Portage Learning/CHEM 121 Final Exam Questions and Answers- Portage Learning
chem 121 final exam questions and answers portage learningchem 121 final exam questions and answers portage learningchem 121 final exam questions and answers portage learningchem 121 final exam
Exam 1
Question 1
1.
Convert 1005.3 to exponential form and explain
your answer .
2.
Convert 4.87 x 10
-6
to ordinary form and explain
your answer .
1. Convert 1005.3 = larger than 1 = positive exponent,
move decimal 3 places
= 1.0053 x 10
3
2. Convert 4.87 x 10
-6
=negative exponent =smaller
than 1, move decimal 6
places = 0.00000487
Question 2
Using the following information, do the conversions
shown below , showing all work:
1 ft = 12 inches
1 pound = 16 oz
1 gallon = 4 quarts
1 mile = 5280 feet
1 ton = 2000 pounds
1 quart = 2 pints
kilo (= 1000)
milli (= 1/1000)
centi (= 1/100)
deci
(= 1/10)
1 / 3
1.
25.6 mg = ? grams
2.
1.5 gal = ? qts
1.
25.6 mg x 1 g / 1000 mg = 0.0256 grams
2.
1.5 gal x 4 qts / 1 gal = 6.0 qts
Question 3
Do the conversions shown below , showing all work:
1.
246
o
K = ?
o
C
2.
45
o
C = ?
o
F
3.
18
o
F = ?
o
K
1.
246
o
K - 273 = -27
o
C
o
K →
o
C
(make smaller) -273
2.
45
o
C x 1.8 + 32 = 1 13
o
F
o
C →
o
F
(make larger) x 1.8 + 32
3.
18
o
F - 32 ÷ 1.8 = -7.8 + 273 = 265.2
o
K
o
F →
o
C →
o
K
Question 4
1.
Show the calculation of the density of benzene
if 28.6 g occupies 32.7 ml.
2 / 3
2.
Show the calculation of the volume of 14.3 grams of acetone with density of
0.785 g/ml
1.
D = M / V = 28.6 / 32.7 = 0.875
2.
V = M / D = 14.3 / 0.785 = 18.2 ml
Question 5
1.
1.0780 contains ? significant figures.
2.
5.23 contains ? significant figures.
3.
5.23 x 1.0780 = ? (give answer to correct number
of significant figures)
1.
1.0780
contains
5
significant figures
2.
5.23
contains
3
significant figures
3.
5.23 x 1.0780 = 5.63794 = 5.64 (to 3 significant
figures for 5.23)
Question 6
Classify each of the following as an element, compound,
solution or heterogeneous
mixture and explain your answer .
1.
Honey - is not on periodic table (not element)
- no element names (not
compound) appears to be one substance = SolutionPowered by TCPDF (www.tcpdf.org)
3 / 3
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