3/13/2014
NYSABE 2014 Conference
Home Strategies Home
Strategies
for Common Core Standards Success ‐‐
Kitchen Science
NYS Language RBE‐RN @ NYU
Tel. (212) 992-6730
Fax (212- 995-4199)
Email: [email protected]
2014 NYSABE Parent Institute
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How can we use a naked egg to teach osmosis?
Key words
–Osmosis
–Semi‐permeable membrane
–Cell
–Cell membrane
–High concentration
–Low concentration
Low concentration
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How can we use a naked egg to teach osmosis?
What is a naked egg?
A k d
i
th t h
h ll
A naked egg is an egg that has no shell.
How do you remove the shell of an egg?
You can remove the shell of an egg by soaking the egg in vinegar.
Why doesn’t the egg fall apart after the shell is removed?
shell is removed?
Underneath the egg shell, there is a membrane that holds the egg white and yolk in place when the egg shell is removed.
2014 NYSABE Parent Institute
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How can we use a naked egg to teach osmosis?
• This membrane is called a semi‐permeable membrane It allows some substances (like water)
membrane. It allows some substances (like water) to go through it but not others.
• What else do you know of that has a semi‐
permeable membrane?
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How can we use a naked egg to teach osmosis?
2014 NYSABE Parent Institute
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How can we use a naked egg to teach osmosis?
• The cells in our body have semi‐permeable membranes These membranes control the
membranes. These membranes control the movement of water in and out of the cells.
• Why is it important for the membranes to control the movement of water in and out of the cells?
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How can we use a naked egg to teach osmosis?
 Place one naked egg in water. Place another naked egg in corn syrup
naked egg in corn syrup.
 What happens when you soak the eggs in those liquids for a certain amount of time?
 Remember! There is a need to control the amount of water in and out of the cells.
amount of water in and out of the cells.
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Kitchen Science
What can we learn from making
i cream?
ice
?
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Key Words
•
•
•
•
•
•
•
Solid
Liquid
Gas
Freezing
Phase changes
Thermometer
Mixture
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Testing prior knowledge
• What do we call water in the solid, liquid
or gaseous form?
• What is the freezing point of water?
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Testing prior knowledge
• If the outside temperature is minus 15
g
F,, what does that mean?
degrees
• When water changes from solid to liquid,
what do we call that change?
2014 NYSABE Parent Institute
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Let’s make soursop ice cream!
Directions
1. Place 1 cup of milk, 2 tablespoons of sugar,
½ cup of soursop juice, 1 teaspoon of vanilla
extract in a one-quart zip lock bag. Remove
air from the bag and close it tightly. Shake
the bag
gg
gently
y until the sugar
g is dissolved.
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Let’s make soursop ice cream!
Directions
2. Put 4 cups of ice in a one-gallon bag. Use a
thermometer to measure the temperature of
the ice. Record the temperature here:
_____°C.
2014 NYSABE Parent Institute
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Let’s make soursop ice cream!
Directions
3. Add 1 cup of salt to the ice. Put the smaller
bag containing the mixture of milk, soursop
juice, sugar, vanilla extract in the larger bag.
Add more ice to the larger bag but do not
overfill. Close the bag
g tightly.
g y Make sure it
does not leak.
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Let’s make soursop ice cream!
Directions
4. Shake the large ziplock bag gently,
continuously until the mixture in the small
ziplock bag hardens. Measure how much
time it took. Record the time here: _______
minute(s).
minute(s)
2014 NYSABE Parent Institute
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Let’s make soursop ice cream!
Directions
5. Open the large bag and remove the small
bag. Measure the temperature of the ice
water. Record the temperature here:
_______°C. Open the small bag and
share the ice cream with your partner(s).
Bon appétit!
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Let’s answer these questions in our groups
as we savor the ice cream.
• Wh
Whatt was the
th temperature
t
t
off the
th ice?
i ?
• What was the temperature of the ice water at
the end of the experiment?
• If we tried this experiment without adding the
salt, what do you think will happen? Why?
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Let’s answer these questions in our groups
as we savor the ice cream.
• What effect do you think the salt had on the
ice?
• What did you learn from this experiment?
• What did you learn today that you can share
with your child?
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Summary
• Did the salt raise the temperature of the ice
to melt it or did the salt lower the temperature
necessary to keep the ice frozen? Use data
from the experiment to answer this question.
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Key Concept
• Freezing point depression
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How can we use a naked egg to teach osmosis? • What happened to the naked egg we left soaking?
• Was your prediction correct?
• How do you explain what happened?
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How can we use a naked egg to teach osmosis?
• The egg in water got bigger because water moved into it
into it.
• The egg in corn syrup got smaller because water moved out of it.
• The egg is 90% water. The corn syrup is 70% water.
• How does water move in and out of the cell? 2014 NYSABE Parent Institute
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How can we use a naked egg to teach osmosis?
• Osmosis is the movement of water through a semi permeable membrane from a region of high
semi‐permeable membrane from a region of high concentration to a region of low concentration.
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What did you learn today that you can share with your child? • Osmosis:
– Semi‐permeable Semi permeable
– membranes • Ice‐cream Making
– From liquids to solids
From liq ids to solids
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