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TOPIC: Significant Figures Do Now: Round 9,023.856103 to the… Tenths Ones Hundreds Thousandths

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TOPIC: Significant Figures Do Now: Round 9,023.856103 to the… Tenths Ones Hundreds Thousandths Thousands. We use significant figures when doing data calculations in chemistry Significant figures are important because they tell us how good the data we are using are.

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Presentation Transcript
slide1
TOPIC: Significant Figures
  • Do Now: Round9,023.856103 to the…
  • Tenths
  • Ones
  • Hundreds
  • Thousandths
  • Thousands
slide2
We use significant figures when doing data calculations

in chemistry

Significant figures are important because they tell us how good the data we are using are.

slide4
How to count Significant Figures
  • Look for a decimal
    • Decimal point absent = Atlantic Ocean
    • Decimal point present = Pacific Ocean
  • Start counting from first non-zero number

X 

 X

decimal point absent
5400 m

2 sig figs

has

4 sig figs

Decimal point absent:
  • Start on Atlantic (right) side of #
  • Start counting with first non-zero digit & count until reach end of #

has

5431 m

decimal point present
has

7 sig figs

4 sig figs

has

0.004530 km

Decimal point present:
  • Start on Pacific (left) side of #
  • Start counting with first non-zero digit & count until reach end of #

2545.300 g

every once in a while
Every once in a while:

_

5300 cm

A line above a zero means its significant

slide9
Multiplication and Division

COUNT SIG FIG for each number

Answer can only be as specific as least specific number.

Ex: if one number has 3 sig figs and the other has 5 sig figs, you answer can only have 3 sig figs

slide10
24.56 cm x 14 cm =

2 sig figs

4 sig figs

343.84 cm2

343.8 cm2

343 cm2

340 cm2

Answer: 340

ONLY 2 SIG FIGS

slide12
Addition and Subtraction

Underline lowest place value.

Answer can only be as specific as the least specific number

example
Example
  • 540 + 12.4 + 0.211 + 100 = 652.611

Answer = 700

Hundreds

Tens

Thousandths

Tenths

Answer can only be as specific as the least specific number

More specific

slide14
+

422.63 cm

29.472 cm

115.9 cm

hundredths

Thousandths

Tenths

________________

568.002 cm

568.00 cm

568.0 cm

568 cm

Answer: 568.O

Tenths

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