DN: Feathers vs Rocks (pg 45) Which has the greatest: A) Volume? B) Mass? C) Density ? Explain each answer 100 pounds of feathers 100 pounds of rock

Which is less dense: ice or water?

Mass Mass is the amount of matter (“stuff”) in a substance Measured with a scale

Volume The amount of space something takes up

Density It is a measure of how tightly packed and how heavy the molecules are in an object. (Density is the amount of matter within a certain volume.)

Practicing with Volume…. Calculate the volume of the following objects. Show ALL variables and work, even if using a calculator. 1.Green Textbook 2.Blue textbook 3.Your lab tray 4.Your table top

Green Textbook

Blue Textbook

Lab Tray

Table top

Units for density g/cm 3 or g/ml Formula: M = mass V= volume D = density

1)Find the mass of the object 2)Find the volume of the object 3)Divide : Density = Mass - Volume To find density : Ex. If the mass of an object is 35 grams and it takes up 7 cm 3 of space, calculate the density.

1)Find the mass of the object 2)Find the volume of the object 3)Divide : Density = Mass - Volume To find density : Set up your density problems like this: Given: M = Unknown: D=? V = Formula: D = M / VSolution: Ex. If the mass of an object is 35 grams and it takes up 7 cm 3 of space, calculate the density.

A lead cylinder has a mass of 540 grams and a density of 2.70 g/ml. Calculate the volume of the lead cylinder.