Chemistry Reference
In-Depth Information
2.4 Significant Digits
2.64 Express each of the following lengths in centimeters (to
the proper number of significant digits):
(a) m (b) m
(c) m (d) m
2.65 Convert each of the following distances to meters, and
express the results as ordinary numbers (not in exponen-
tial notation).
(a) mm
(b) cm
(c) km
2.66 How many significant digits are present in each of
the following measurements? How many decimal place
digits?
(a) 127.900 kg (b)
(c) 0.3930 mL (d) 2.002 m
2.67 Underline the significant digits in each of the following
measurements. If a digit is uncertain, place a question
mark under it.
(a) 1.630 cm (b) 8.090 cm
(c) 0.022 cm (d) 4000 cm
2.68 Underline the significant digits in each of the following
measurements. If a digit is uncertain, place a question
mark below it.
(a) 41.07 cm
2.55
Underline the significant digits in each of the following
measurements. If any digit is uncertain, place a question
mark below it.
(a) 67.00 km
10
3
4.0
10
3
4
4.00
10
3
4.000
10
3
(b) 0.0013 kg
(c) 690 m
(d) 209 L
2.56
Underline the significant digits in each of the following
measurements. If a digit is uncertain, place a question
mark below it.
(a) cm (b) cm
(c) cm (d) m
2.57
Convert each of the following values to ordinary (decimal)
notation:
(a)
1.00
10
5
1.00
10
5
5.0
10
2
5.02
10
2
1.00
10
3
7.00
10
2
5.000
10
2
12.88 cm
3
6.000
10
3
6.00
10
3
cm
(b)
cm
6.0
10
3
6
10
3
(c) cm (d) cm
2.58
Express each of the following volumes in milliliters:
(a)
7.00
10
3
7.0
10
3
L
(b)
L
7
10
3
(c) L
2.59 Express each of the following measurements in liters:
(a)
3.00
10
3
3.0
10
3
mL
(b)
mL
3
10
3
(c) mL
2.60 Underline the significant digits in each of the following
measurements. If a digit is uncertain, place a question
mark below it.
(a) 4.000 mm (b) 0.0040 cm
(c) 4000 m (d) 40.00 km
2.61
Round off each of the following measurements to three
significant digits:
(a) 0.0637425 cm
(b) 0.637425 cm
(c) 6.37425 cm
(d) 63.7425 cm
(e) 6374.25 cm
2.62 Round off each of the following measurements to three
significant digits:
(a) 0.02316 cm
(b) 0.2316 cm
(c) 23.16 cm
(d) 2316 cm
2.63
Do the following calculations to the proper number of
significant digits:
(a) 6.17 cm 3.722 cm
(b) 3.09 cm 122.7 cm
(c) 7.07 g/1.81 mL
(b) 6050 cm
(c) 400.0 cm
(d) 0.00120 m
(e) 220 mm
2.69
How many significant digits are present in each of the
following measurements? How many decimal place
digits?
(a) 0.020 kg (b)
(c) 403 mL (d) 1.0 m
2.70
Report the length of the shaded bar, using each of the
rulers shown:
33.0 cm
3
0
1
2
3
4
0
1
2
3
4
Centimeters
2.71
Add the following quantities, and report the answers to
the proper number of significant digits:
(a)
(b)
(c)
(d) 42.7 km
61.4 km
219 g
17.39 g
6.11 mL
0.012 mL
1.102 mL
0.013 mL
