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Heating and Cooling

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What you will learn from this videoWhat you will learn
- Heating and cooling can cause changes we can see.
- Sometimes these changes are reversible and can be changed back.
- Sometimes these changes are non-reversible and cannot be changed back.
- Discussion Questions
Before Video
What causes chocolate to melt?ANSWERHeat causes chocolate to melt. When something melts it changes from a solid to a liquid.
Ice, ice cream, popsicles, chocolate and crayons all melt when heated up. Even metal can melt when heated, but it has to get extremely hot.
It freezes into ice. Freezing is when something cools down and changes from a liquid to a solid.
A reversible change is a change that can be undone or changed back. Melting and freezing chocolate is an example of a reversible change.
Observable means we can see it with our eyes. Scientists use their senses to make observations and understand the world around us.
After Video
What are some examples of heating?ANSWERHeating up marshmallows in a fire and heating up clothes with an iron are both examples of heating.
Cooling down a drink with ice and cooling your breath due to the cold air outside are both common examples.
Butter changes from a solid to a liquid when it is heated.
A reversible change means the change can be undone. If the object that changed can go back to its original form, then it is reversible.
Melting butter then cooling it and melting an ice cube then re-freezing it in the freezer are both common examples.
Popcorn popping, cooking eggs, making cupcakes, and lighting something on fire are all common examples. You know it’s non-reversible because it cannot change back to the original form.
- Vocabulary
- Heating DEFINE
To raise the temperature of something.
- Cooling DEFINE
To lower the temperature of something.
- Reversible Change DEFINE
A change that can be undone.
- Non-Reversible Change DEFINE
A change that cannot be undone.
- Solid DEFINE
Matter that keeps its shape.
- Liquid DEFINE
Matter that takes the shape of its container.
- Melting DEFINE
The process of changing from a solid to a liquid.
- Freezing DEFINE
The process of changing a liquid to a solid.
- Heating DEFINE
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