Mass
Measurement of the amount of matter
(or stuff) in an object
Measured in grams (g)
Volume
Measurement of the amount of space an object takes up
Measured in milliliters (ml) or cm3
Which do you think would have the greater volume? The greater mass?Why?
Which one is more dense?
Demonstration: People in a square
How about this: Which square is more dense?
Which one is more dense?
Now which one is more dense?
To find the density
3- Divide
Density = Mass g
Volume c³
Let’s try some density problems together Work on these problems with your neighbor
1 Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its density?
2. Frank also has an eraser. It has a mass of 3g, and a volume of 1cm3. What is its density?
3. Jack has a rock. The rock has a mass of 6g and a volume of 3cm3. What is the density of the rock?
4. Jill has a gel pen. The gel pen has a mass of 8g and a volume of 2cm3. What is the density of the rock?
Change Mass AND Keep Volume Same
Increase the mass increase density
Decrease the mass decrease in density
Which container has more density?
A B
Change Volume AND Keep Mass Same
Increase the volume decrease density
Decrease the volume increase density
Which container has more density?
A B
In your notebook illustrate the answer to the following question:What 2 ways will INCREASE density?
What 2 ways will INCREASE density?
Liquid Layers
If you pour together liquids that don’t mix and have different densities, they will form liquid layers.
The liquid with the highest density will be on the bottom.
The liquid with the lowest density will be on the top.
Objects or substances with MORE density will sink below objects or substances with LESS density
Which do you think is MORE dense,
Water or Oil???
Water, Oil…and a Superball
The oil is less dense than the water, so it’s on top. The superball is less dense than water, but more dense than oil, so it sinks to the bottom of the oil layer, yet floats on the top of the water layer.
The density of five liquids are measured as follows:
Liquid 1: 1.0 g/mL
Liquid 2: 1.38 g/mL
Liquid 3: 0.77 g/mL
Liquid 4: 2.95 g/mL
Liquid 5: 0.056 g/mL
Draw a picture of all 5 liquids in a test tube how they would layer according to density
Liquid Layers
Check out this picture. Which layer has the highest density?
Which layer has the lowest density?
Imagine that the liquids have the following densities:
10g/cm3. 3g/cm3.
6g/cm3. 5g/cm3.
Which number would go with which layer?
Liquid Layers – Try with your neighbor
Which liquid has the highest density?
Which liquid has the lowest density?
Which liquid has the middle density?
Liquid Layers Try on your own!
Imagine that the liquids on the right have the following densities:
15g/cm3 10g/cm3
3g/cm3 9g/cm3
7g/cm3 12g/cm3
Match the colors to the correct densities.
Review
What is the formula for density?
What happens if you pour together liquids that have different densities?
Will the liquid on the top have the highest or lowest density?
Will the liquid on the bottom have the highest or lowest density?
Super Scientist Question of the Day
Jake has a book, a ruler, and a balance.
How can Jake find the density of the book with the tools he has?
http://sunhousescience.blogspot.com/
http://www.icoachmath.com/Sitemap/images/Cuboid1.jpg
http://tinfoiler.com/wp-content/uploads/2010/05/Oil-and-water.jpg
http://www.stevespangler.com/stevespangler/uploads/2008/07/seven-layer-column.png
…