DENSITY A Quantitative Physical Property
Which Weighs More?? A Pound of Lead -or- A Pound of Feathers
If You’re Stumped… You’re Thinking About DENSITY
A measurement of the quantity of mass per unit of volume
Density Is an Intensive Property… It is NOT dependent on the amount of a substance present
Density Is a useful tool for identifying pure substances Each substance has a unique density value
The Formula:
Units of Density Generally expressed as grams per milliliter (or grams per cm 3 )
To Measure Mass: Use a Balance
To Measure Volume Use a formula (for regular objects) L x W x H for a cube
What about Irregular Objects? Use “Water Displacement”
Technique: Use a Graduated Cylinder Subtract initial volume from final volume
Practice Problems (POC): Complete problems 1, 2, 3, and 4 on Density Handout Sheet Use dimensional analysis and sig figs (we’ll go over the answers)