understanding density
DESCRIPTION
Understanding Density. Why does regular A&W soda settle at the bottom and Diet A&W soda stay on top?. How do you explain the presence of different layers of liquids?. What are the layers? . Why are there layers?. If you could see the particles inside each layer, how would they look?. - PowerPoint PPT PresentationTRANSCRIPT
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Understanding Density
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Why does regular A&W soda settle at the bottom and Diet A&W soda stay on top?
OBSERVEWhat do you see?
SHARETalk to a partner
WONDERWhat questions do you
have?
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How do you explain the presence of different layers of liquids?
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What are the layers? Why are there layers?
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Question What would be important to
learn? Questions?
How would you test it?
What did you learn?
Why are there different layers
of liquids?
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If you could see the particles inside each layer, how would they
look?
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REVIEW: PROPERTIES OF MATTER1. Organize a notebook page2. Copy the table in your notebook. Fill in with the correct answer.
Definition Unit of Measurement
Symbol
Matter
Mass g,kg
Weight N
Volume
3. How do you measure the following: (Explain or provide a diagram) a. mass of a solid, liquid, and solid crystals
b. volume of a liquid, a regular solid, and an irregular solid
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1 meter
1 decimeter
1 centimeter 1 millimeterNot drawn to real
size
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MEASURING VOLUMEUnit: liters (l) or milliliters (mL)
Liquids
Regular Solids (volume = l x w x h)Irregular Solids (Water displacement)
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Measuring Volume of a Liquid
Close Up View of Liquid in Graduated Cylinder
The curved surface of the liquid is called a meniscus. As a standard procedure, always read the level of the liquid at the bottom of the curve
Source: http://www.lincoln.smmusd.org/staff/burdettet_web/meniscus.html
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Understanding Density
Week of Feb. 27-28
[ ] DAY 1- Introduce
[ ] DAY 2- Explore
Week of March 4-6
[ ] DAY 1- Extend
[ ] DAY 2- Summarize
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Why are there different layers of liquids?Possible answers
How would you test it? Explore
Observations What did you learn?
1. Some liquids thicker than others
2. Some liquids are “denser” than others
Density = Mass__ Volume
3.
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Why are there different layers of liquids?Possible answers
How would you test it? Explore
Observations What did you learn?
1. Some liquids thicker than others
Mix with water
“Feel the liquid”
Flow Test
K=Javier’s “Fork” test
Drop test
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Group 1 2 3 4 5 9Honey Baby oil Alcohol Water Dishwash
ing LMaple syrup
1 0.79
2 0.97
3 0.86
4 1.29
5 0.99
61.4
RANK 6 1 2 4 3 5
Baby oil 0.79
Alcohol0.86
Dishwashing Liquid
0.97
Water 0.99
Maple syrup1.29
Honey 1.4
Why do the liquids in the column separate? Why doesn’t the mass and volume of the liquid matter?
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What happens when we drop different objects into the column? • •
Explain why?
Baby oil 0.79
Alcohol0.86
Dishwashing Liquid
0.97
Water 0.99
Maple syrup1.29
Honey 1.4
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Full-sized candle floats
Half-sized candle floats
Half-sized candle sinks
A Tale of Three Candles
Explain why?
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Mass = 10 g
Vol = 20 mL
Density = Density = Density =
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Mass = 10 g
Vol = 20 mL
Mass = 5 g
Vol = 10 mL
Mass = 5 g
Vol = 10 mL
Mass = 2.5 g
Vol = 5 mL
Mass = 2.5 g
Vol = 5 mL
Mass = 2.5 g
Vol = 5 mL
Mass = 2.5 g
Vol = 5 mL
Density = 10g/20mL = 0.5 g/mL
Density = 5g/10mL = 0.5 g/mL
Density = 10g/20mL = 0.5 g/mL
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Source: http://www.chemistryland.com/CHM130S/02-MMM/Measure/Measuring.htm
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H
L
W
Volume= L x W x H = 10cm x 5cm x 7cm = _________ cm3
Volume = _______ ml
MEASURING VOLUME
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Source: http://www.chemistryland.com/CHM130S/02-MMM/Measure/Measuring.htm
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How do you measure the volume of an irregular object?
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Source: http://www.chemistryland.com
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http://www.youtube.com/watch?v=fE2KQzLUVA4 Seven Layer Density
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UnderstandingDensity?
D= Mass/Volume
Why are there different layers?
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…can explain how to calculate the density of an object.
…can calculate the density of brown sugar in a bag that measures 5cm3 and weighs 500g.
can identify 3 states of matter.
… can explain how to find the volume of an irregular -shaped object.
… can give the units for mass and volume.
…can define density. …can explain how to measure the mass of a solid.
… explain why an ice cube floats in water.
…can calculate the volume of a square wooden box if one side is 6 cm.
… can give the formula for volume.
…can define volume.
…can give the formula to find the density of an object.
…can explain which is heavier: a kg of gold or a kg of feathers.
…can explain how to measure the volume of a liquid.
… can define mass …can explain 2 ways how to change the density of an object