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Ice-cream in a bag science experiment : Fizzics Education

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Ice-cream in a bag

Ice-cream in a bag

Follow FizzicsEd 150 Science Experiments:

You will need:

  • Half a cup of milk.
  • Half a cup of cream.
  • Chocolate or strawberry topping.
  • A medium strong plastic freezer bags
  • 2 Zip-loc bags.
  • Half a cup of salt
  • Crushed ice and a hand towel
  • A mixing bowl
  • A spoon

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How to make ice-cream Science experiment - setup_materials
1 How to make ice-cream Science experiment - mixing milk, cream and topping

Mix the milk, cream and topping in the mixing bowl.

2 How to make ice-cream Science experiment - transfer of milk substance to zip-loc bag(2)

Pour the mixture into a Zip-loc bag.

3 How to make ice-cream Science experiment - transfer of milk substance to zip-loc bag

Squeeze the air out of the bag and seal it.

4 How to make ice-cream Science experiment - double bagging mixture

Place the bag with the mixture into another bag, and seal it again.

5 How to make ice-cream Science experiment - mixing ice and salt(1)

In the mixing bowl, mix the crushed ice and table salt.

6 How to make ice-cream Science experiment - transfer salt_ice mix into freezer bag

Place the Zip-loc bag containing the mixture into a freezer bag.

7 How to make ice-cream Science experiment - transfer salt_ice to freezer bag

Fill the freezer bag with the crushed ice and salt mixture.

8 How to make ice-cream Science experiment - mixing bag solutions

Place your sealed bag of cream mixture into the freezer bag with crushed ice and salt. Push out the air and seal the bag.

9 How to make ice-cream Science experiment - massaging bags

Holding the bag in a hand towel, gently massage or shake the freezer bag to cool the ice cream mixture. Make sure the crushed ice surrounds the inner Zip-loc bag.

10 A child biting into a chocolate ice cream

After about 15 – 20 minutes of gently moving the ice around the bag of cream, your ice cream is ready to eat!

11 A man holding a blow torch onto a white tile whilst wearing safety glasses

Get the Unit of Work on Heat Energy here!

  • What actually is heat?
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  • How does heat change the properties of materials and more!

Includes cross-curricular teaching ideas, student quizzes, a sample marking rubric, scope & sequences & more

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12 Four kids smiling whilst a fog cloud spills over the side of a science presentation desk past a measuring cylinder, thermos and kettle
13 Teacher showing how to do an experiment outside to a group of kids.

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– Help students learn how science really works

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Why Does This Happen?

Water normally freezes at 0oCelsius, however, adding the salt causes the freezing point of the ice to be lowered. A 10% solution of salt in water lowers the freezing point of water to -6oCelsius, whereas a 20% salt solution lowers the freezing point to -16oCelsius. Saltwater, therefore, needs a lower temperature to become a solid. This means that you end up having ‘supercooled water’ touching the inner bag, which helps to freeze the ice cream inside.

Variables to test

More on variables here

  • With gloves on, try dry ice instead. Does this work better or worse?
  • Try the experiment without salt.
  • Try pure thickened cream vs adding some water to it. Does this change the texture and freezing time?

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Learn more!

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