1. Rules for Determining Significant figures

2. In science, measured values are reported in terms of significant figures.
Significant figures- in a measurement consist of all the digits known with the certainty plus one final digit, which is somewhat uncertain or estimated.

3. 1. All nonzero digits are significant 325 3.21
3 significant figures 4,
4 significant figures

4. Examples: How many significant figures?
b) 85236
c) 52
d) 10
e) 94.32

5. 2. Zeros between nonzero digits are significant
4 significant figures

6. a) 101
b) 2102 C)
d) 60510 e)

7. 3. Zeros at the end of a number AND to the right of a decimal are significant figures.
6 significant 4 significant figures
figures

8. a) b)
c) 50.0
d) 500
e) 6.030

9. 4. Zeros to the right of a decimal BUT before a nonzero digit are not significant figures.
1 significant 3 significant figures
Figure
0.0(258)
0.00(3)

10. a) 0.002 b) c)
d) .068 e)

11. How many significant figures?
B. 100
1 significant figure C D
3 significant figures

12. NOTE: *Importante*
When working out calculations, your answer should have the same number of significant figures as the number in the problem with the least number of significant figures. For example:
= ?

13. How many significant figures? Which rule applies? 45.00 0.0012
4 figures 2 figures
3 figures figures
5 figures figure
2 figures figures

14. Density (D) = mass (m) volume (v)
More practice:
Density (D) = mass (m) volume (v)
So, what is the density of an object if the mass is g and volume is12.7 mL?
11.079g
D = 12.7mL
g/mL answer but using the correct significant figures …….
Answer with correct significant figures = g/mL