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NAME,
CHEMISTRY PER. DATE.
__ Dx
SIGNIFICANT FIGURES
Indicate the number of significant figures in each of the following measurements.
1, 28,875 m 5. 081g
2, 0.00051 kg 6. 51.2000 m
3 258,000 km 7. 2.00g__
4, 305, 100 em 8. 0.00500 kg
Operations with significant figures: rewrite the given answers so they have the correct
significant figures. And do NOT forget units.
9 125gx 86°C = 10.75gT
10. 100.00g + 25.0mL = 4 g/mL
11, $00.00¢m x 40.00cm = 20,000 m7
12, 38em + 5.100cm + 4.130m = 4723em
13, 71655g — 0.005g = 716.545
14, 28.00g + 85.2cm = 03286385 gem _
15. 8.000km — 0.54km = 7.46 km
16. 23.18m + 6819m = 29999m
‘Scientific Notation:
17. Convert 0.00800 to scientific notation.
18. Convert 1,680,000 to scientific notation
19. Find the sum: 3.8.x 10°
+45 «10%
20. Find the product: ( 7.0.x 10+) ( 6.0.x 10%) =
21. sFind the product: ( 8.2 x 10-5) (3.7.x 107) =
22. Find the quotient; 8.35 x10" —
3.2 x103
2A. Find the difference: 1.8 x 10%
= 5.6x107
25, Find the difference: 99x 1075
9x 10° Operations with “units”: Determine the units of the answers to the following problems,
26. 5280m x_1km = $28
1000 mw
27. 125em x 100cm = 125
28. 52Ske = 19
28k.
29. 565g — 382 _ 02
Bem x 18cm x Soom =
30 552g + 268g ~ 123g = 943
31. (20.5 mL) (1.00 g/mL) (128° C)= 262__
Unit Factor Method: Show how you solve for the answers using the unit factor method
(canceling similar units) Show work here:
32, Convert 2118 mL to L.
33. Convert 0.015 L to mL,
34. Convert 52.5 mto mm
35. Convert 22.7 egto g
36. Convert 102 gto mg
37. Convert 45.2 mm to em
38, Convert 22,100 mm to km
39. Convert 0.025 kg to eg
40, Convert 0.025 kg to cg
Densit
= massvolume = W/V
Show work here
41. What is the density ofa liquid with a mass of 25.0 g
and a volume of 30.0.cm ? (Must have sig. fig.)
42 A student determines that the mass of a metal rod
is 12.0 g, He places 10.0 mL of water in @ 25 mL.
graduated cylinder When the metal rod is placed
in the water, the graduated cylinder then reads
15,0 mL.. What is the density of the metal rod?
“2
