Download Unit Conversions - TrimbleChemistry

Name ______________________________________________ Date ________________ Class ____________
Name
Period
Date
Review Sheet: Measurement and Matter
Read over your notes, and rework your homework assignments (especially those you didn’t do
well on). Reviewing your labs may also be helpful. The Chemistry Reference Sheet and %
error formula will be provided. You will do AWESOME on this test if you can do the following
things.
USING MEASUREMENTS




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.
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
 Use my website for review games and PowerPoint presentations.
***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.
(31.2-24.5)/31.2 = .215*100 = 21.5%
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.
(58.14-44.2)/58.14 =.240*100 = 24.0%
DETERMINE THE NUMBER OF SIGNIFICANT FIGURES IN THE FOLLOWING NUMBERS:
3. 320,000 mm 2
4. 0.0400 g 3
5. 5,000 km 1
6. 68,050 mL4
CONVERT THE FOLLOWING NUMBERS INTO OR OUT OF SCIENTIFIC NOTATION:
7. 0.000506 mL 5.06x10-4
8. 42,000,000,000 nm4.2x10-10
9. 5.00  10-3 km.00500
10. 8.200  102 m8200.0
CALCULATE AND EXPRESS ANSWERS IN THE CORRECT UNITS AND # OF SIG FIGS.
11. (0.00600 m)  (0.030 s) =.20
14. (5,200 cm) (0.07 cm) =400
12. (167.55 g) – (87.3 g) =80.3
15. (12.5 g)  (6.0 g/cm3) =2.1
13. (50.75 mL) + (155 mL) =206
16. (370 mg) + (1200 mg) =1600
PERFORM THE FOLLOWING SI UNIT CONVERSIONS (watch sig figs!):
17. 177 mL = __.177______ L
19. 0.093 kg = __93000______ mg
18. 56 m = ____5600_____ cm
20. 54,400 m = ___54.4_____ km
USE DIMENSIONAL ANALYSIS TO SOLVE THE FOLLOWING PROBLEMS:
21. George walks 1.5 km to school. If each step he takes is equal to 2.25 ft, how many steps
does he take?
1.5km 10 3 m 1cm
1 ft
1step
x
x 2 x
x
 2187.22  2200
1 km 10 m 30.48cm 2.25 ft
22. How many pounds does 1.0 quart of motor oil weigh if the density of motor oil is 0.80 g/mL?
1.0qt x
0.9463L 1mL
x 3  946.3  950mL
1.0qt
10 L
23. How many milliliters are in a 20.0-oz. bottle of soda? (There are 32 oz. in 1 quart.)
20.0oz x
1qt .9463L 1mL
x
x 3  591.4  591mL
32oz
1qt
10 L
24. An ant is about 4.0 mm long. How many ants does it take to span 2.0 feet?
2.0ft x
12in 2.54cm 1mm
1ant
x
x -1
x
 152.4  150ants
1ft
1in
10 cm 4.0mm
25. 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?
1.0m 3 x
1cm 3
1mL 1can
x
x
 2816901.4  2800000cans
3 3
3
(10 ) m 1cm 3 355mL
A. Draw a diagram to represent 8 particles in each state of matter. (HINT: Recall that plasma is gaslike but with one major difference.)
SOLID
LIQUID
GAS
CLASSIFICATION OF MATTER
Classify the following as element (E), compound (C), heterogeneous mixture (H), or solution (S).
1. neon gas
E
3.
clean air
S
2.
orange juice
H
4.
carbon dioxide (CO2) C
5.
Compare and contrast a mixture and a compound. How are they alike/different?
6.
How are homogeneous and heterogeneous mixtures different? Give examples of each
(not listed above).
PROPERTIES & CHANGES IN MATTER
Classify the following properties of matter as chemical (C) or physical (P).
7.
flexible
P
9.
boils at 20C
P
8.
combustible
C
10. low reactivity
C
Classify the following physical properties of matter as extensive (E) or intensive (I).
11. melting point
I
13. volume
E
12. mass
E
14. density
I
Classify the following as chemical changes (C) or physical changes (P).
15. grapes fermenting
C
19. water evaporating
P___________
16. copper melting
P
20. eggs cooking
C
17. recycling aluminum
P
21. iron rusting
C
18. gasoline exploding
C
22. wood burning
C
23. mixing cake batter
P
24. baking a cake
C
List the terms for the physical changes below:
25. liquid  solid
freezing
28. gas  liquid
condensation
26. solid  liquid
melting
29. solid  gas
sublimation
27. liquid  gas
vaporizing
30. gas  solid
deposition
DENSITY
Solve the following problems. Show your work and put the correct units!
31. What is the density of a substance, in g/mL, that has a mass of 0.653 g and a volume of
1.25mL
.653g/1.25mL=.5224= .522 g/mL
32. What is the mass of a substance, in grams, that has a volume of 1.70 cm 3 and a density of
0.750 g/cm3?
.750g/cm3 x 1.70cm3 =1.275 = 1.28g
33. You have a substance that has a mass of 92.0 g and a volume of 115 mL. Can this
substance float on water which is 1.0 g/mL?
92.0g / 115 mL = .8 =.800 g/mL
YES
Ch. 2 – Matter & Its Properties
HONORS CHEM