Download Measurement Review

Name:
Date:
Mr. Rodriguez
Physics is Life
Chapter 1 Review Sheet #4
***ALL ANSWERS MUST INCLUDE THE PROPER UNITS AND NUMBER OF SIG FIGS***
CALCULATE PERCENT ERROR FOR THE FOLLOWING VALUES:
1. Marisa determined the melting point of a substance to be 24.5C. Find the percent error of her
measurement if the actual melting point is 31.2C.
2.
The molar mass of butane is 58.14 g/mol. Using his lab data, Tyrone calculated the molar mass
of butane as 44.2 g/mol. Find the percent error of his measurement.
DETERMINE THE NUMBER OF SIGNIFICANT FIGURES IN THE FOLLOWING NUMBERS:
3. 320,000 mm
4. 0.0400 g
5. 5,000 km
6. 68,050 L
CONVERT THE FOLLOWING NUMBERS INTO OR OUT OF SCIENTIFIC NOTATION:
7. 0.000506 mL
8. 42,000,000,000 pm
9. 5.00  10-3 km
10. 8.200  102 m
CALCULATE AND EXPRESS ANSWERS IN THE CORRECT UNITS AND # OF SIG FIGS.
11. (0.00600 m)  (0.030 s) =
12. (167.55 g) – (87.3 g) =
13. (50.75 mL) + (155 mL) =
14. (5,200 cm) (0.07 cm) =
15. (12.5 g)  (6.0 g/cm 3) =
16. (370 mg) + (1200 mg) =
SOLVE THE FOLLOWING DENSITY PROBLEMS:
17. Limestone has a density of 2.72 g/cm 3. What is the mass of 24.9 cm 3 of limestone?
18. Helium has a density of 0.017 g/L. What is the volume of a weather balloon that contains 38 g of
helium?
19. A 0.750-cm3 sample of platinum has a density of 21.4 g/cm 3. What is its mass?
PERFORM THE FOLLOWING SI UNIT CONVERSIONS (watch sig figs!):
20. 177 mL = _______ L
21. 56 m = ______ cm
22. 0.093 kg = ______ mg
23. 54,400 m = ________ dm
USE THE FACTOR-LABEL METHOD TO SOLVE THE FOLLOWING PROBLEMS:
25. George walks 1.5 km to school. If each step he takes is equal to 2.25 ft, how many steps does he
take?
26. Susanna is 5.50 ft tall. What is her height in centimeters?
27. A can of Diet Pepsi® contains 355 mL of soda. How many cans would have to be opened in order
to fill a 1.0 m3 tank? {1m3 = 1.0 x 106mL}
28. How many milliliters are in a 20.0-oz. bottle of soda? (1 oz = 29.57mL.)
29. An ant is about 4.0 mm long. How many ants does it take to span 2.0 feet? (1mm = 3.28 x 10-3ft)
30. One serving of Jello® instant pudding requires 28.0 g of mix. If each box contains 107 g of mix,
how many boxes are required to serve 15 people?
31. How many pounds does 1.0 quart of motor oil weigh if the density of motor oil is 0.80 g/mL? ( 1g =
0.0022lbs, 1 quart = 966mL)
Measurement Review
ANSWER KEY
***ALL ANSWERS MUST INCLUDE THE PROPER UNITS AND NUMBER OF SIG FIGS***
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
21% or 21.5%
23.9% or 24.0%
2
3
1
4
5.06  10-4 mL
4.2  1010 pm
0.00500 km
820.0 m
0.20 m/s
80.3 g
206 mL
400 cm2
2.1 cm3
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
1570 mg
67.7 g
2,200 L
16.1 g
0.177 L
5,600 cm
93,000 mg
0.544 dm
2,200 steps
168 cm
2800 cans
591 mL
150 ants
3.93 boxes
1.7 lbs
CHEMISTRY Test STUDY GUIDE
Measurement
Read over your notes, and rework your homework assignments and quizzes (especially those you didn’t do well on).
Reviewing your labs may also be helpful. The Periodic Table Reference Sheet will be provided. You are responsible
for knowing the % error and density formulas. You will do awesome on this test if you can do the following things.
Using Measurements (p. 44-57)
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Explain the difference between accuracy and precision.
Calculate % error.
Use the correct number of sig figs when making a measurement.
Identify the number of significant figures in a number.
Round off calculated answers to the correct number of sig figs.
Convert between normal and scientific notation.
Distinguish between direct and inverse proportions.
Units of Measurement
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
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Differentiate between a number and a quantity.
Perform density calculations.
Calculate density from the slope of a “Mass vs. Volume” graph.
Unit Conversions
 Perform SI prefix conversions.
 Perform unit conversions using dimensional analysis.
REMINDERS:
 You must show work for all calculations.
 Answers must include units & the correct # of sig figs.
 You must use dimensional analysis (grid method) for all unit conversions except simple SI prefix
conversions.
QUESTION SHEET
A meniscus is the curved surface at the top of a column of liquid. In a science class, this liquid is usually
water or some sort of aqueous solution, and the column is usually a graduated cylinder or a pipet. As you
may have noticed, when water is in such a thin glass tube, it does not have a flat surface at the top.
Instead, the top is curved inward, making it a little difficult to decide exactly where to read the volume. As
pictured below, the volume should be read from the bottom of the meniscus.
Why doesn’t water lie flat? Well, it has to do with the nature of the water molecules and glass molecules
themselves. Water is made up of polar molecules, which have positively and negatively charged ends.
Since opposites attract, the positive sides attract the negative sides, and all of the molecules stick to one
another. This is why water droplets can form. Glass molecules also happen to be polar. Again, since polar
molecules like to stick together, the water in a glass tube will actually tend to stick to the sides of the tube!
You can see this at the top of the graduated cylinder, where the water will slightly creep up the sides and
form a curve, which is the meniscus.