Density

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# Density - PowerPoint PPT Presentation

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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### 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…..

Prediction

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)

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?
• 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
• Materials
• Clean paper
• Electronic balance
• Ruler
• Work in a group of four
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
• Matter can change from one state to another
• Take out heat
• There are five (5) phase changes
E. Physical Properties of matter
• Density
• Shape
• Size
• Color
• Texture
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
• A change that produces a new substance
• Example: burn a piece of paper

http://www.bbc.co.uk/schools/scienceclips/ages/10_11/rev_irrev_changes_fs.shtml