Thermal Contradiction

Project 8 out of 20

See how calcium chloride reacts with water and ice.

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In this Thermal Contradiction experiment, you’ll observe a different kind of chemical reaction as you combine calcium chloride with water and then with ice. Using what you’ve learned so far in Lesson 4 about exothermic and endothermic reactions and thermodynamics, you’ll combine substances to see how the temperature changes outside of a chemical reaction. Set up your experiment using the supplies in your kit, as well as some crushed ice and spare coins. First, you’ll put finely-crushed ice into a cup on top of the cork hot pot stand that you’ve gotten a bit wet. See if the cork will freeze to the bottom of the cup after you stir the ice for a few minutes. Then, you’ll add calcium chloride to your ice and stir again, seeing how this changes the experiment. Finally, you’ll add calcium chloride to a vial of water and observe what kind of reaction happens here.

Milestones Unlocked

Exothermic vs. Endothermic Reactions

Introduction to Thermodynamics

Balancing Chemical Equations

Course Progression

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Lesson Preview

Is it getting hot in here, or is it just your chemical reactions? All chemical reactions produce a change in energy, but why and how can we observe this phenomenon in real life? Crack open this kit and start Lesson 4 to experiment with chemical reactions and thermodynamics. You’ll be able to tell the difference between exothermic and endothermic reactions and be able to identify them based on their reactivity graphs. You’ll also learn the basics of balancing chemical equations—an essential skill for any chemist. Unlock more chemistry skills and crucial concepts that will allow you to understand more of the world around you.

    Chemistry Course


    20 Experiments


    Ages 10+


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