DENSITY A Quantitative Physical Property. Which Weighs More?? A Pound of Lead -or- A Pound of Feathers.

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Presentation transcript:

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)