Density kb.notebook
November 23, 2015
Density
Notes
Nov 19­6:21 PM
Density:
• the amount of matter in a given space, or volume. • Density = Mass/Volume
Nov 19­6:21 PM
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Density kb.notebook
November 23, 2015
Density:
• Remember: “Density will break your heart”
(mass)
(volume)
.....................Don't Go Breaking My Heart
Nov 19­6:21 PM
Density
• May change at higher temperatures
• Unit of density is grams/cubic centimeter or g/cm3 • Unique so can be used to identify matter
Looking at the
boxes to the
right, which box
do you think is
more dense? Why?
Nov 19­6:21 PM
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Density kb.notebook
November 23, 2015
"Magic Triangle"
Easy way to algebraically manipulate the density formula
Nov 19­8:01 PM
Float or Sink? Lab
Object
Sink or Float
More or less
dense than
water
Nov 19­8:04 PM
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Density kb.notebook
November 23, 2015
Gummy Bear Lab
Problem: What would happen to a gummy bear if it was submerged in water overnight.
Materials:
Safety:
Gummy Bear
water
weighing paper
beaker
triple beam balance
ruler
General Glass Variables: Manipulated (Independent) - Submerged in water overnight
Responding (Dependent) - Size (mass, volume, density)
Controls - Brand of Gummy, time, temperature & amount of water Hypotheses: If the MV, Then the RV, because the "why".
Predictions:
Mass: Larger or smaller
Volume: Larger or smaller
Density: Larger or smaller
Nov 18­4:49 PM
Conclusion: Rubric is on Google Classroom.
Nov 19­8:44 PM
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Density kb.notebook
November 23, 2015
Gummy Bear Lab
https://www.youtube.com/watch?v=astISOttCQ0
Nov 18­4:25 PM
Density Review
1. What is density?
2. What is the formula for density?
3. How do you use the "Magic Triangle?"
4. If an object floats is it more or less dense than water?
5. If your Gummy Bear sank to the bottom of the beaker, is it more or less dense than water?
Nov 19­8:13 PM
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Density kb.notebook
November 23, 2015
Is density an intensive or extensive
physical property?
• Intensive Physical Property: Does not depend on the amount of matter present. Can be used to identify a substance.
Examples: color, malleability, ductility, boiling point
• Extensive Physical Property: Depends on the amount (extent) of matter. Examples: length, volume, and mass Nov 19­8:26 PM
Notes #1
Is density an intensive or extensive
physical property?
50 mL
50 mL
100 mL
100 mL
• The density of water is 1.0 g/mL.
Nov 19­8:28 PM
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Density kb.notebook
November 23, 2015
Density is an intensive
property!
Therefore it does not matter upon
the amount of water. Water will
have the same density at one
temperature.
http://www.wiley.com/college/chem/brady184764/resources/ch01/ch1
_rsrc_density_anim.html
What about a BIG block of Copper and a small block of Copper? Will they have the same density?
Nov 19­8:31 PM
Nov 19­8:35 PM
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