Sig Fig Calculations and Density

Password Rules

• Trying to get volunteer to say the word on screen

• Can’t say the word or any part of it• Person with ace goes first• Person with two does second word etc.

Beaker

Graduated Cylinder

Fire Blanket

Watermelon

Significant Figures

Hawaii

Erlenmeyer Flask

Rubber Stopper

Mullet

Burette

Scientific Notation

Standard Notation

Sig Fig Rules

How many sig figs?• 34.500 s (3 sig figs)

• 0.0087 g (2 sig figs)

• 3507 m (4 sig figs)

• 1500 mL (2 sig figs)

• 200078 km (6 sig figs)

Multiplication and Division

• Idea is to not add any sig figs that we didn’t already have.

• Mult. And Div. Rule: The answer must have the same amount of sig figs as the least accurate measurement (the one with the least amount of sig figs)

• Ex. 10.4 x 4.1 x 00.03963 = 1.7 3 sig figs 2 sig figs 4 sig figs4.1 is our least accurate measurement with only 2 sig

figs; therefore, our answer will only have 2 sig figs as well.

Mult. and Div. Practice

Calculator Says Answer1) 3.24 m x 7.0 m = 22.68 23 m2

2) 100.0 g ÷ 23.7 cm3 = 4.21909283 4.22 g/cm3

3) 0.02 cm x 2.371 cm = 0.04742 0.05 cm2

4) 710 m ÷ 3.0 s = 236.66… 240 m/s5) 1818.2 lb x 3.23 ft = 5872.786 5870 lb•ft6) 10.030 g ÷ 2.87 mL = 3.49477… 3.50 g/mL

Density

Does a bowling ball float in water?

• https://www.youtube.com/watch?v=oKqJ3q7b1O8

• This is a cool demonstration and good explanation of density