Mass, Weight, and Density

Density is mass per unit of volume.

M

D = -------

V

Volume

For a rectangular solid:

V = LWHFor a cylinder:

V = πr2hFor an irregular solid:

???

Volume

How are we going to find the volume of an irregular solid?

Volume

Volume

Lab # 2

Using Density to Find the Thickness of a Wire

Lab # 2

Part 1:

Find the density of copper.

MD = -------

V

Lab # 2

Part 2:

Using the density, find the volume of a sample of copper wire. M

V = ------- D

Homework

• Read ChemLab 2 (pp 46-47)

• Answer the Pre-Lab questions

Today:• Collect raw data

• Graph mass vs. volume

Tomorrow:• Do the math

• Answer discussion questions 3 and 6