Ice Cream & Science Lesson

Delicious ice-cream experiment using nothing but salt, ice and a few freezer bags. Oh, and its healthy too!

What You'll Need

  • 100mls Greek Yogurt
  • 100mls Cream
  • 6 Strawberries

Equipment

ice-cream-on-a-cone-hand-drawn-dessert

  • Bowl
  • Ice
  • Salt
  • 3 ziplock freezer bags  – small, medium and large
  • fork
  • tea towel
  • oven gloves

How to Do It

  1. 1Mash the strawberries with a fork.
  2. 2Pour the yogurt and cream into a bowl together , stir on the strawberries. Mix it all together.
  3. 3Pour into the smallest freezer bag. Zip it closed.
  4. 4Put the small freezer bag inside the medium freezer bag and zip lock that.
  5. 5Put the ice and salt in the biggest freezer bag and sit the medium freezer bag into this. Zip lock it closed.
  6. 6Hold the big freezer bag with a tea towel for oven gloves and SHAKE, SHAKE, SHAKE for 10 minutes until the liquid turns to a frozen solid - ICE-CREAM.

Science Bites: How it Worksstrawberry

  • The salt changes the melting point of the ice.
  • A melting point is where a solid changes into a liquid. In a solid state – molecules are tightly packed.
  • By adding salt to the ice it separates out into Na and Cl and this disrupts the ability of the ice to freeze.
  • The more salt added the more effect it has on freezing and melting.
  • Salt lowers the temperature at which water freezes ( this is called a freeze point
    depression) so the salt ice will melt even when the temperature is below normal freezing.
  • This change in melting point causes ice to take energy from the warm cream mixture and the environment. This energy melts the ice

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