A Science Lesson On Density

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Let's Layer Some Liquids!

• A Science Lesson On Density

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What Is Density?

• Density is how closely elements are packed
  together.
• An element is like an ingredient in a mixture.
  Just like there are many different ingredients
  that make up brownies, there are many different
  ingredients, or elements, that make up liquids.
• The closer the elements are packed together, the
  heavier the object is and the heavier the density
  of that object is.
• The farther apart the elements are, the lighter
  the object is and the lighter the density of that
  object is.

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An Example of Density

• Imagine you have a big empty box.
• If you put two pillows into the box, the pillows
  will not be packed together very tightly and the
  box is going to be very light.
• If you force pillow after pillow into the box
  until the pillows are overflowing, the pillows
  will become packed together more closely and the
  box will become heavier.
• The box with only two pillows in it has a lighter
  density than the box with a lot of pillows in it.

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Density and Liquids

• Liquids are made up of many different elements.
• The the elements are in a liquid, the
  heavier the density of that liquid is. So the
  liquid will weigh more.
• The apart the elements are
  in the liquid, the lighter the density of that
  liquid is. So the liquid will weigh less.

CLOSER
F A R T H E R
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Activity Time!!!
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Materials Needed

• Bring with you
• A pencil for each person
• A piece of paper for each person
• The following items will be found at your
  designated station
• 2 Baby jars
• 2 cups of the following liquids
• Cooking Oil
• Syrup
• Vinegar (Red liquid)
• Dish soap (Blue liquid)

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First Step

• Carefully pour one cup of each liquid into one of
  the baby jars. Feel free to pour the liquids in
  any order you want!
• When pouring the liquid into the jar, make sure
  you pour the liquids very slowly and carefully.
• Ask the teacher for an example of this if you
  need one.

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Observation Time!

• Take a few minutes to observe what the liquids do
  after you have poured each liquid into the same
  jar.
• Do the liquids mix together?
• Do the liquids layer in the order you poured each
  one into the jar?

Write a few sentences explaining your
observations.
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Now go to your station to finish the first step!
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Prediction Time!

• Since you were allowed to pour the liquids in any
  order you chose, now I want you to try something
  different.
• I want you to make a prediction on what will
  happen if you pour the liquids slowly into the
  jar in the following order
• Syrup
• Dish soap (Blue liquid)
• Vinegar (Red liquid)
• Cooking oil

Think Carefully!

• Hint Think about what you observed while
  watching your first mixture settle into layers.
• Now you and your partner write a few sentences
  explaining your predictions.

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Second Step of the Activity

• Carefully pour the liquids into the other clean
  baby jar in the following order
• Syrup
• Dish soap (Blue liquid)
• Vinegar (Red liquid)
• Cooking oil

Make sure you are pouring the liquids into the
jar the same way you did the first time, very
slowly and carefully.
Hint Write this order down so you do not mix
them incorrectly.
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Observation Time!

• Take a minute to write a few sentences about what
  you observed during the second experiment.
• Were your predictions correct?
• Put the lid on the second baby jar and slowly
  turn it upside down.
• Write down what you observe about the liquids.
• Do the layers stay in the same place?
• Do the liquids mix together?

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Now go to your station to finish the second step!
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What Did You Learn?

• You and your partner discuss and record your
  answers to the following questions
• What role do you think density played in layering
  the liquids?
• Feel free to look back through the lesson to
  refresh your memory on density.
• Ask the teacher if you need help going back in
  the lesson.

• Which liquid to you think has the heaviest
  density?
• Which liquid do you think has the lightest
  density?
• Would the liquids have layered themselves if they
  all had the same density?

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Densitys Role

• If the liquids used in this activity did not have
  different densities, the liquids would not have
  layered like they did. They would have mixed
  together.
• The liquid on the bottom of the layers, the
  syrup, had the heaviest density. That is why it
  sank to the bottom each time.
• The liquid on the top of the layers, the cooking
  oil, had the lightest density. That is why it
  was on top of the rest of the liquids each time.

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Time to Clean Up.

• Please go back to your designated station to
  clean up your mess.
• Throw away the empty cups.
• Pour the layered liquids into the sink.
• Rinse out the sink and the baby jars.
• Leave the baby jars upside down on the paper
  towel next to the sink.
• Wipe up any spills you might have made during the
  activity.

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Thank you for Participating!
Blue Ribbon Performances!!!
Were Done!
Great Job!
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While Other Teams Are Finishing Up.

• If you finish before others are done, please go
  to the following website.
• http//www.spartechsoftware.com/reeko/
• Click on Internet Explorer.
• Click on the arrow to pull down the Internet
  options.
• Highlight the above website and click on it.
• Have Fun!