1. Which weighs more … a pound of feathers or a pound of lead?

2. As you know, it’s a trick question …
They both weigh one pound.

3. The Better Question
What would be more compact … a pound of feathers or a pound of lead?
Of course, it’s the pound of lead.
Why is this?
Because of the DENSITY of each substance.

4. Density
A physical property of matter (it is not related to any chemical reaction and it is INDEPENDENT of the amount of the substance that you have)
Defined as the mass per unit volume of a substance
What are some units we can use for:
Mass?
Volume?

5. How is Mass Determined? Mass is determined by weighing the substance in question

6. How Is Volume Determined
How Is Volume Determined? Volume can be determined by calculation (if the shape of the substance is known)

7. How Else Is Volume Determined
How Else Is Volume Determined? Archimedes’ Principle: When an object is submerged in a liquid, it displaces a volume of the liquid equal to its own volume. Eureka!

8. Check for Understanding
Work on Density Practice Problems

9. Density of Liquids Lab
You will now calculate the densities of several liquids.
You will use your density calculations to create a column of liquids that will be separated by their respective densities.
What do you do first?

10. Density Lab Step 1: Read thru the lab sheet
Step 2: With your partner, create a step by step recipe or procedure for you to follow. Write this in your lab notebook.
Step 3: Have your procedure approved by me!
Step 4: Start your lab.
Step 5: Write up your lab