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Density - PowerPoint PPT Presentation

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Density. Why are boys so dense some times?. DEMO. Materials: One liter beaker One small vial (about 25 mL) Cold water (cooled with ice and let melt) Colored hot water (use a dark color for best results) Foil Pencil Piece of string. Observation. A. What is density?. Defined as….

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Why are boys so dense some times?

  • Materials:

One liter beaker

One small vial (about 25 mL)

Cold water (cooled with ice and let melt)

Colored hot water (use a dark color for best results)



Piece of string


a what is density
A. What is density?

Defined as…..


What do you think will have greater mass?

  • A gram of feathers
  • A gram of chocolate
Which one will have more volume?

(what does this mean)

1. A gram of feathers

2. A gram of chocolate

To determine the density of an object use:

Density = mass (g)

Volume (mL) or (cm3)

Notice the units? These will be included with your answer!!

math skills and science
Math Skills and Science
  • Write the original formula
  • Solve the formula for the missing variable
  • Substitute the values and units
  • Math
  • Record answer with proper units, box or happy cloud
Let’s practice, regular shaped solid

Determine the volume of this cube. ____________________

The mass is 20.0 g.

What is this cube’s density? _____________________

1.O cm

1.O cm

1.O cm

b what is density good for anyway
B. What is density good for anyway?
  • Density is a physical property of matter
  • Density is specific to the type of matter
    • Example: water has a density of 1.0g/mL
    • Example: bag of materials with all the same masses but different volumes
  • Therefore (drum roll please……. )
    • Density can be used to identify unknownsubstances
chocolate lab
Chocolate Lab
  • Materials
    • Clean paper
    • Electronic balance
    • Ruler
    • Work in a group of four
c solid liquid gas and plasma
c. Solid, liquid, gas, and Plasma

1. Solid

  • a state of matter that had a definite shape and volume.
  • Particles of matter are tightly packed together. The particles cannot change position. They can only vibrate.
2. Liquid
  • State of matter that has a definite volume but not definite shape.
  • Liquids are able to change shape because the particles of a liquid can change position.
3. Gas
  • State of matter that have no definite shape or volume.
  • Gas takes the shape of its container.
  • The particles of gases are constantly moving. They are much farther apart.
4. Plasma:
  • State of matter made up of small electrically charged particles which make it up.
  • It is very rare on Earth but it is found in other parts of the universe. You can find it in stars where the temperature and the pressure are very high
d changes in states of matter
D. Changes in states of matter
  • Matter can change from one state to another
    • Add heat
    • Take out heat
  • There are five (5) phase changes
e physical properties of matter
E. Physical Properties of matter
  • Density
  • Shape
  • Size
  • Color
  • Texture
f physical change
F. Physical Change
  • A change that does not produce a new substance
    • Example: rip a piece of paper in half
    • Example: freeze water
      • Still the same chemical composition, can put it back to its original state
g chemical change
G. Chemical Change
  • A change that produces a new substance
    • Example: burn a piece of paper