Day 22
Investigation 5 part 1
Layering Salt Water
Setting the Scene
• Observe the bottles.
• What is happening?
• Can you explain why the liquids behave the
way they do?
Challenge of the day
• There are four liquids
• Layer all four liquids in a
section of straw
Materials
Container with 4 liquids
Straw & holder
Pipettes (4)
Paper Towels
Using the
straw
• Push straw over
ball of holder at a
slight angle.
Using the
straw
• Gently squeeze a few
drops of each liquid
into the straw
Using the
straw
• Gently squeeze a few
drops of each liquid
into the straw
– Let the drops slide
down the side of the
straw
Using the
straw
• Gently squeeze a few
drops of each liquid
into the straw
– Let the drops slide
down the side of the
straw
Using the
straw
• Gently squeeze a few
drops of each liquid
into the straw
– Let the drops slide
down the side of the
straw
Directions
• Record all trials using colored pencils on the
“Liquid Layers” worksheet
• Circle the correct layering diagram
• Answer the question for Part 2
Discussion
• What do you think caused
the salt solutions to layer
this way?
Discussion
• The liquids are made with water and salt
• How is it that some salt solutions can be heavy
and some light if they are made with the same
materials?
Salt Amounts By Color
Amount of
Salt
Red
Solution
Green
Solution
Yellow
Solution
Blue
Solution
0 ml
60 ml
120 ml
210 ml