1. Density of Fluids Investigation 5, Part 1
Convection
Density of Fluids
Investigation 5, Part 1
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2. Setting the Scene
Discuss: What is the root cause of the layering of the liquids in the bottles?
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3. Challenge: Can you layer salt water? The materials you get to use are…
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Straw & holder
Colored salt water

4. Using the standing tube---
Gently squeeze a few drops of each liquid into the straw at a time.
When at first you don’t succeed, try and try again.
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5. When using the straw---
Let the drops slide down the side of the straw to avoid unwanted mixing.
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6. Record Data Read and follow directions on “Liquid Layers” lab sheet
Discuss part 2, but wait for discussion before answering the question.
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Student lab Notebooks . P.21- Liquid layers

7. Discussion
What do you think caused the salt solutions to layer this way?
Did the salt change the properties of the water?
How is your layer similar to my layering? Is it caused by the same thing?
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Student lab Notebooks . P.21- Liquid layers

8. Can you order these items from lightest to heaviest?
Ponder this!
Can you order these items from lightest to heaviest?
100 ml
marbles
100 ml
jelly
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100 ml cotton
100 ml
iron

9. Weight and volume Cup of beans and the cup of foam cubes
Which do you think is heavier?
Think about this:
Cups are the same size and full
How can one be heavier than the other?
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10. Mass vs. Volume Mass Volume The amount of matter in an object
You find mass by measuring the weight in grams
Volume
Is how much space a sample of matter occupies
Measured using graduated cylinders
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11. Density The amount of matter in a volume of material
Density = mass / volume
Ratio between the mass of matter and its volume
Equal volumes of material
One is heavier than the other
Heavier material is denser
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12. Consider salt solution
Do you think density played a role in the layering activity?
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13. Determining Density
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Will these 2 identical volumes of liquids have the same mass?
Make a prediction!

14. Mass Investigated Mass 25.0 g Mass 28.2 g Which solution is denser?
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Which solution is denser?
How do you know?

15. Discuss with group Which solution would layer on top of the other?
What does this tell you about how liquids of different densities interact?
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16. Masses and Volumes
Mass
Volume
Red
25.0 g
25 ml
Green
26.5 g
Yellow
28.2 g
Blue
30.0 g
On the “Liquid Layers” lab, write the masses and volumes
Answer part 2 in your own words
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Student Lab Notebooks .P 21 - Liquid Layers

17. Densities of colored salt solutions
Turn to “Calculating Density”
Transfer data from”Liquid Layers” page
Calculate the density (D = M / V) and answer the questions at the bottom
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Student Lab Notebooks .P 21 and P.23 - Liquid Layers

18. Answer Red = 1.00 g/ml Green = 1.06 g/ml Yellow = 1.13 g/ml
Blue = 1.20 g/ml
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Student Lab Notebooks .P 21 and P.23 - Liquid Layers

19. Revisiting density bottles
Observe the bottles again
Explain those observations in terms of density
Talk to group, then we’ll share
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20. Response Sheet Turn to page 25 in your lab book Read and complete
Work with partner or table
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Student Lab Notebooks- P. 25

21. Reading Read Density on page 27 of the green resource book
Use ‘outline’ format to record notes from each section of the text
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Resource Book P.27
Teacher Master Answer Sheet P. 391