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please help with pre post questions olwxd due by Wednesday the 30th
Unformatted Attachment Preview
wame. Jasrat Singh
INSTRUCTOR: Professor Rosenfeld
DATE:
\2319
SECTION/GROUP: Chim lolx.006
POST-LAB: LABORATORY 1
Complete the calculations required in each of the following sections. Be sure to carry units throughout
when appropriate. Show all work for full credit.
1. Indicate the number of significant figures in each of the following numbers:
0.00101
1203.0
12.000
130001
2.00
5100.0
2. Round the following numbers to three significant figures:
64400
54.68
23.64
0.00345
5003
549.65
3. Multiplication/Division. Calculate the following and express the answer in the correct number of
significant figures:
a. 0.02403 x 12.0 =
R
b. 18.7623/1.0081 =
c. 43.86 x 15.753 =
d. 1250/610 =
Laboratory 1 | Review of Mathematics
13
4. Addition/Subtraction. Calculate the following and express the answer in the correct number of
significant figures.
a. 20.987 + 43.1 =
b. 200. - 0.0012 =
C. 23.9865 - 1.8 + 2.56 =
d. 1.874 +0.01272 + 12.8458 =
5. Complete the following operations using the exponential numbers provided. Be sure to use the
correct number of significant figures and proper scientific notation:
a. Convert number to scientific notation:
23,000
0.0000012 =
b. Convert scientific notation to number:
2.56 x 10-5 =
4.56 x 106 =
c. Multiply. (1.27 x 1015) x (2.7 x 10-5)
d. Divide. 9.5 x 1010 = -2.5 x 102 =
e. Subtract. 7.34 x 1023 – 1.34 x 1023 =
f. Add. 3.80 x 1023 + 6.91 x 1025 + 7.32 x 1027
6. Complete the following calculations using all of the rules for significant figures:
a. (2.34 x 10-3 + 1.75 x 10-2) = 0.69 =
=
b. [6.577 + (4 – 2(55.9 x 1.45 x 10-4))0.5] = 66.1
7. Simplify the following values using the proper metric prefix:
a. 2.33 x 10-ºg
b. 20,000 tons =
c. 3.4 x 1012 bytes
=
d. 0.0000000000000077 seconds
=
8. Replace the following metric prefixes with the appropriate power of ten:
a. 400 gigabytes
=
b. 15 nanoseconds =
c. 44.01 ug
-
d. 5.89 L =
=
9. Putting it all together: Calculate the following, maintaining both proper units and
significant figures.
a. Calculate the wavelength of the line in the spectrum in which n = 5. Note that m-1 is a unit.
- 10,973,700 ( - )
m-l;
';
λ =
10. What is the change in density if a sample goes from 3.21 g/L to 5.43 g/mL?
11. For each set of data provided, calculate the statistics requested.
a. The accepted value of the boiling point of pure ethanol is 78.4 °C. Trying to verify that
value, you obtain the following six values. Determine the average and percent error for
your
measurements.
Trial #
Boiling point
Trial 1
78.2 °C
Trial 2
77.1 °C
Trial 3
79.0 °C
Trial 4
77.9 °C
Trial 5
77.7 °C
Trial 6
78.9 °C
b. You have been given a crate containing 10,000 bags of M&M's. You carefully weighed each
bag and generated the following table. What is the average weight of a bag of M&Ms from
this crate?
Lot #
Bag Mass (g)
# of bags
268-43
53.94 g
2174
268-44
55.98 g
3674
268-45
56.92 g
3377
268-47
60.93 g
775
12.
In the lab, a group carefully measures the weight of the same item four times with the following
results. How should they report their answer to account for precision?
Trial
Mass
1
12.3569 g
2
12.3572 g
3
12.3583 g
4
12.3566 g
13. Complete the following.
a. Make a computer generated graph of the following data points. Is the relationship linear? If so,
state the slope and y-intercept. Are the variables directly proportional?
Base (mL)
pH
Base (mL)
pH
2.82
3.5
5.67
0
8.94
3.97
4.0
0.5
12.15
4.5
4.34
1.0
12.44
5.0
4.60
1.5
12.60
5.5
4.82
2.0
12.71
6.0
5.04
2.5
12.80
6.5
5.30
3.0
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