Chem 1 Worksheet #15 Text Reference: Pgs 44-48, 50-52 Name ____________________________
Vocabulary: standard scientific notation, exponent, significant figure, accuracy, precision
Summary: The use of scientific notation is explored as well as determining the number of significant figures in measurements.
1.
Express each of the following numbers in standard
scientific notation.
a.
529
b.
240,000,000
c.
301,000,000,000,000,000
d.
78,444
e.
0.0202
f.
0.1550
g.
0.0000104
h.
0.000000000000000000129
2.
Express each of the following as an
"ordinary" decimal number.
a.
7.24 x 10-9
b.
1.9444 x 10-6
c.
4.921 x 10-3
d.
1.4 x 101
e.
4.6 x 100
f.
3.954 x 103
g.
7.4434 x 105
h.
2.9 x 102
i.
1.03 x 109
3. If you are using a ruler to measure the length of a pencil, and the ruler has divisions in inches, which of the following measurements for the length of the pencil are reasonable (correct). You may choose any that are correct.
a) 3 in.___ b) 3.5 in.___
c) 3.48 in. ____ d) 3.4 in. ___ e) 4 in. ___ f) 3.49 in. ___ g) 3.51 in. ___
How many certain digits are there in the correct
measurements? ______
How many uncertain digits are there in the correct
measurements? ______
How many significant digits are there in the correct
measurements? ______
4. How many significant figures are there in
each of the following measurements?
a. 1.498 grams _____ b. 248.3 seconds _____
c. 9.855 milliliters _____ d.
76.414 kg _____
e. 8.0335 cm _____ f. 0.05587 m _____
g. 1.40082 cm_____ h. 0.00058900 g _____
i. 0.00300900870 mm_____ j. 4500 km
_____
k. 350.000 cm _____ h. 3.50 x 103 cm _____
i. 1.604 x 10-4 m_____ j. 0.040 x 107 g _____
k. 575
twinkies _____ l. 3 prom queens
_____