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)
• 1500 mL (2 sig figs)
• 0.0087 g (2 sig figs)
• 200078 km (6 sig figs)
• 3507 m (4 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 figs
4.1 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
1)
2)
3)
4)
5)
6)
Calculator Says
Answer
3.24 m x 7.0 m =
22.68
23 m2
100.0 g ÷ 23.7 cm3 = 4.21909283 4.22 g/cm3
0.02 cm x 2.371 cm = 0.04742
0.05 cm2
710 m ÷ 3.0 s =
236.66…
240 m/s
1818.2 lb x 3.23 ft = 5872.786
5870 lb•ft
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=oKqJ3q7
b1O8
• This is a cool demonstration and good
explanation of density