Homemade Ice Cream Science

Taniya Henderson

Tier 1

Lesson Plan

Homemade Ice Cream Science

Learn freezing point depression

In this lesson, participants will make ice cream in a bag to explore the scientific concept of freezing point depression and understand the states of matter. This hands-on activity not only provides a delicious treat but also offers a practical demonstration of how salt can lower the freezing point of ice, turning a liquid into a solid. It's an engaging way to learn scientific principles while enjoying a fun family activity.

Audience

Adult and Family

Time

30 mins

Approach

Learn freezing point depression

Materials

Quart-sized ziplock bags, Gallon-sized ziplock bags, Ice cubes, Salt, Sugar, Vanilla extract, Milk or cream, Spoons, Bowls, Towels, and Discussion Questions

Step 1

Introduction

5 mins

Briefly introduce the concept of freezing point depression and states of matter.
Explain the activity: making ice cream using simple ingredients and observing the science behind it.

Step 2

Preparation

5 mins

Distribute materials to each participant or group.
Ensure everyone has the necessary ingredients and tools: quart-sized bag, gallon-sized bag, ice, salt, sugar, vanilla, milk/cream.

Step 3

Making Ice Cream

10 mins

Instruct participants to fill the quart-sized bag with milk/cream, sugar, and vanilla extract.
Seal the bag tightly, ensuring no leaks.
Fill the gallon-sized bag halfway with ice and add salt.
Place the sealed quart-sized bag inside the gallon bag and seal it.
Shake the bags vigorously for about 5-7 minutes until the mixture hardens into ice cream.

Step 4

Discussion

5 mins

Discuss the science behind the activity using the prepared questions.
Explain how salt lowers the freezing point of ice, allowing the mixture to freeze.
Discuss the change in states of matter from liquid to solid.

Step 5

Tasting and Conclusion

5 mins

Allow participants to open their bags and enjoy their homemade ice cream.
Recap the scientific principles learned during the activity.
Encourage participants to share their thoughts and experiences.

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Discussion

Discussion Questions

A set of questions to guide the discussion on the science behind making ice cream in a bag.

What is freezing point depression and how does it apply to making ice cream?

Discuss how adding salt to ice lowers its freezing point, allowing the ice cream mixture to freeze.

How does the state of matter change during the ice cream making process?

Explore the transition from liquid (milk/cream) to solid (ice cream) and the role of temperature.

Why is it important to seal the bags tightly during the process?

Emphasize preventing leaks and ensuring the mixture is properly insulated to freeze.