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Unit 1 Review
Name:
Measurement and Uncertainty
1. When looking at a measuring tool, how will you decide the uncertainty (+/-)?
Period:
2. In the following numbers, circle the estimated digit. What were the smallest markings on the measuring tool?
a.
3.5 m
b. 3.5 cm
c. 22.8 mL
3. Read the graduated cylinder to the right. Circle the estimated digit and include units and uncertainty in your answer.
____________
Conversions between units
Use your knowledge of the metric system to complete the following conversions.
Show your work using Dimensional Analysis.
4. 5.6 kg = _____ g
6. 120. mg = _____ g
5. 1 cm = _________μm
7. 6.3 cm = ____mm
3 mL
8. What are the 3 conversions you know for moles?
a.
1 mol = _____________
b. 1 mol = _____________
c. 1 mol = _____________
Use the conversion factors above to solve the following problems. Show your work using Dimensional Analysis.
9. 3.01 x 1023 atoms of Cu =
moles of Cu
12. At STP 1.5 moles of He (g) =
L of He (g)
10. 2.0 moles Na =
atoms of Na
11. At STP 11.2 L of O2(g) =
moles O2(g)
13. 2.20 moles of Sn =
grams of Sn
14. 28 grams of C =
moles of C
Dimensional Analysis
15. How many gallons of soft drink are there in a 2.0L bottle? Fact: 1 gallon ≈ 3.785 L.
16. The density of water at room temperature (25°C) is 0.9970 g/cm3. How many pounds does the water in a full 5.00
gallon pail weigh?
Facts: 1 cm3 = 1 mL, 1 gal ≈ 3.785 L, 0.453 kg ≈ 1.0 lb.
Scientific notation
Write the following in standard notation.
17. A) 2.71 x 104
B) 6.4 x 10–3
Write the following in scientific notation.
18. A) 2,687
4 mL
B) 0.012654
Perform the following calculations, answering in proper scientific notation (if appropriate) with the correct number if
significant figures.
A. (6.02 x 1023) x (8.65 x 104)
B) 7.85 x 1026
6.02 x 1023
Significant Figures
How many sig figs does each of the following measurements have?
19. 7.991 x 10-10 g____
21. 0.00030 hL _____
22. 890 kg ______
Perform the following calculations, answer with the correct units and number of sig figs.
23. A) 86 m/s x 32.421 s = ___________
B) 2.11 x 103 g / 340 mL = __________
Describe each scenario in terms of both precision and accuracy:
24. A basketball player attempts five shots and hits the front of the rim each time.
25. A basketball player attempts five shots and makes it each time. SWISH!
26. A basketball player attempts five shots. He hits the rim three times and makes it twice.
27. A basketball player attempts one shot and makes it.
Percent Error and Uncertainty:
28. A student measures using an electronic balance the mass of a samples of salt as 43.21 g +/- 0.02 g. How many
significant figures are in this measurement? What is the uncertain digit? What factor affects the certainty of this
measurement?
29. The theoretical mass of the above sample of salt is found to be 45.00 g. Determine the percent error in the
student’s measurement.
Density & Graphing
30. Sketch a graph that shows the density of a substance. Make sure you label the axes appropriately. What are the units
of density?
31. The reason that oil floats on top of vinegar in salad dressing is that oil is __________ dense than vinegar.
Classification of matter:
32. Classify each as a homogeneous mixture, a heterogeneous mixture, an element or a compound. Also indicate
which lab technique(s) could be used to separate the mixtures (distillation, evaporation, or filtration).
Matter
Classification
Possible separation techniques (mixtures only)
Water and alcohol (alcohol’s BP = 195oC)
Gatorade
butane (C4H10)
a quartz crystal (SiO2)
gold (Au)
Sand and water
33. Give at least one example of each of the following:
A pure substance that is an element –
A pure substance that is a compound –
A homogeneous mixture –
A heterogeneous mixture -