5. Density and SigFigs

What is Density?
Defined as?

- A property of ?

-Determines which substance is going to _____ in another____

- the mass of a substance that occupies a certain unit of
volume

-A property of solids, liquids and gases

-to float or sink in another
substance

- Density is an ____ property

- Also helps _______ components of a mixture

ex?

- Density is an intensive property

- Also helps segregate components of a mixture

- (example: blood)

density formula

density = mass / volume. (d = m / v)

most important units of measurement

- g/cm cubed
- g/ml

Volume formula?

Volume = length x width x height

1mL = how many cm?

1mL = 1cm cubed

significant digits

- Represent the amount of?

- Are considered when
calculating ______ like ____-?

- Should be followed when
expressing _____ answers
involving _____

- amount of
uncertainty in a measurement

- calculating quantitative
property like density

- expressing final answers
involving calculations

Significant digit rules (5)

1. All digits from 1 - 9 are significant.

23.55 has 4 SigFigs
2.6 has 2 SigFigs

2. Zeros between non-zero digits are
significant.

101 has 3 SigFigs
5207 has 4 SigFigs

3. Zeros at beginning of a number are not
significant.

0.029604 has 5 SigFigs
0.0002091 has 4 SigFigs

4. Zeros at the end of a number are
significant only if the number has a
decimal point.

1,000,000. has 7 SigFigs
1,000 has 1 SigFig
0.0250 has 3 SigFigs

5. When calculating with SigFigs, your
answer should have the lowest sigFigs number

SigFigs number.
8.4 x 5.23 x 10.681 =
= 469.237692
= 470 is the final answer

(closest 10 number?)

- Final answer must have the _____ number of _____ ______ as the _____ given

- Final answer must have the same
number of significant digits as the least given

do practice questions

do practice questions