1. Matter
Matter is ANYTHING that has mass and takes up space.

2. Matter Is All Around Us Where is it in our classroom? Lab Tables
Chairs
People
Pencils
Books
Even the air.

3. All Matter Has Mass
How do we find out how much matter and object contains?
Measure the mass.
What tool do we use?
What unit?
Grams (g)

4. Mass vs. Weight
The mass of an object is always the same no matter where it is located.
Weight is a measure of the amount of gravity exerted on an object.
We weigh less on the moon than
on earth because the moon experiences
less gravity. Our mass is the same.

5. All Matter Has Volume Volume What tools do we use?
The amount of space the matter occupies
What tools do we use?
What Units?
Liters (L) OR
Cubic centimeters (cm3 )
Remember 1mL = 1cm3

6. Density Do all things that are the same volume have the same mass?
Density is the amount of matter in a given space.
Which is more dense: a 1m3 box of feathers or a 1m3 box of pennies?
Pennies – they’re not heavier, they’re more dense

7. Calculating Density Density = Mass Volume
The unit for density is g/cm3 or g/ml M X D V

8. Density is useful for identifying substances for two reasons:
Density stays the same for any SIZE piece of something
The density of one substance is usually different from that of another substance.

9. Fool’s Gold?
To make sure you hadn’t found more fool’s gold (iron pyrite), you could compare the density of your nugget to the know densities on the chart.
D= M/V
D= 96.6/5
D= g/cm3
Mass= 96.6g
Volume= 5cm3
Substance
Density (g/cm3)
Iron Pyrite
5.02
Gold
19.32

10. BrianPop Review

11. Try it out!
A glass marble has a volume of 5 cm3 and a mass of 13 g. What is the density of glass?
What do you know?
Volume = 5 cm3, mass = 13 g
Write the formula:
D = m/v
Substitute into the formula:
D = 13g
5 cm3
Calculate:
D = 2.6 g/cm3
Check that your units agree:
Unit is g/cm3.
Unit of density is g/cm3. Units agree.
Answer:

12. Practice Problems
1. A lead sinker has a mass of 227 g and a volume of 20 cm3. What is the density of lead?
2. A glass of milk has a volume of 100 cm3. If the milk has a mass of 103 g, what is the density of milk?
Answers:
g/ cm3
g/ cm3