How many significant figures are contained in each of the following measurements

Question

How many significant figures are contained in each of the following measurements? What uncertainty (plusminus an amount) is represented by the following measurements? You are measuring a quantity with a measuring device on which the smallest scale division is 0.1 unit. A measurement appears to have a value of exactly 3.2 units. How should you record the measurement in order to property indicate where the uncertainty is located? Round the following numbers so they contain the number of significant figures indicated in parentheses. Carry out the following calculations and write the result using the correct number of significant figures. Assume all numbers represent measured quantities. 0.521 times 2.1 = 0.713 + 6.12 + 11.2 = 4.400/3.92 = 5.472 - 4.001 + 0.0119 =

Explanation / Answer

How many significant figures are contained in each of the following measurements?

2.46 g--------------------- answer=3

10.00 ml----------- answer=10

0.0109 cm ------------answer=3

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3

What uncertainty (± an amount) is represented by the following measurements?

1.0569 g ------------------ answer=±0.0001

7.56 mL----------                          answer=±0.01

1.815 cm---------------            answer=±0.001

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Round the following numbers so they contain the number of significant figures indicated in the parentheses.

1.513 (3)----------------- answer=1.51

0.0155 (2)----------------- answer=0.016

1.494 (1)----------------- answer=1

12.689 (2) -------------------------answer=13

1.494 (1)--------------------------- answer=±1 not 1. because that will be 1.0 with total of two S.F

0.9866 (2)----------------- answer=0.99

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0.521 x2.1 =1.0941=1

4.400/3.92=1238.45=1238

0.713+6.12+11.2 =18.033=18

5.472-4.001+0.0119=1.4829=1

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