HW 2B - Measurement (Significant Figures)

Which of the following numbers contains four significant figures? 0.0230100 23,011.0 0.002301 230,110 0.23010

0.002301

Which of the following measurements has three significant figures? 0.006 g 4.250 g 1,207 g 0.03750 g 0.0250 g

0.0250 g

What is the numerical value of 1.2 x 1.222? Express your answer using the correct number of significant figures. None of these 1.466 1.47 1.4664 1.5

1.5

What is the area of a piece of metal foil that measures 43.9 cm by 29.21 cm? Express the answer to the correct number of significant figures. 1280 cm2 1282.3 cm2 1282.32 cm2 128 cm2 1282.319 cm2

1280 cm2

In which of the following numbers are all of the zeros not significant? 45.060 0.0450 3300 607.80

3300

Which of the following numbers contains five significant figures? 49,100 4.9100 0.04910 0.4910 4,910,000

4.9100

A laboratory technician reports that the mass of a growth removed from a patient is 274.06 g. How many significant figures does this measurement contain? 5 4 None of these 3 2

5

Find the difference between two masses measured as 123.6 grams and 115.972 grams. Express the answer to the correct number of significant figures. 7.63 grams 8.0 grams 7.628 grams 8 grams 7.6 grams

7.6 grams

What is the total length of two pieces of tubing which measure 4.5 cm and 3.222 cm? Express the answer to the correct number of significant figures. 7.722 cm 8 cm 3.722 cm 7.7 cm 4.722 cm

7.7 cm

The numerical value for (5.6 x 104) ÷ (7.89 x 102) is equal to, with the proper number of significant figures: 70.976 7.098 x 101 71 70.98 71.0

71