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A short class with Sarah and her students. The other ways are under More.
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Today, we’re going to learn about physical changes. A physical change occurs when a substance changes its physical form but does not form a new substance. Can someone give me an example of a physical change?
How about melting ice?
Great example! Melting ice is a perfect illustration of a physical change. What happens to the ice?
It turns into water.
Exactly! And remember, the water can freeze back into ice. This is a key feature of physical changes—their reversibility. How does melting ice affect the energy?
It absorbs heat!
Correct! Physical changes typically involve minimal energy changes. Let’s summarize: Physical changes do not create a new substance, they are reversible, and they primarily involve physical properties.
Now, let's explore some more examples of physical changes. Who can name another example?
Dissolving salt in water!
Excellent! When salt dissolves, does it create a new substance?
No, it’s still salt; you can recover it if you evaporate the water.
Correct! Is there a change in size or shape when cutting paper?
Yes! The paper gets smaller but still remains paper.
Exactly! These examples reinforce that physical changes alter the form or appearance without changing the substance itself.
Let's perform an activity to see physical changes in action. Who wants to describe what we will do?
We’ll melt some ice and then freeze it again!
Great! As the ice melts, what do you think will happen to its properties?
The shape and state change, but it's still water.
Correct! When we freeze the water back, it will return to its original state as ice. Can someone tell me what this activity demonstrates?
It shows that physical changes are reversible!
Exactly! Remember, the key takeaway is that in physical changes, no new substances are created, only the state or appearance of the original substance changes.
Ice melts to water, oh so clear, it's just a shift, not something to fear.
Once there was a block of ice named Icy that melted into a stream, showing how changes can flow yet return back to their dream.
Remember 'Murder'', 'Cater' and 'Bridge' for the changes: Melting, Cutting, and Boiling.
R.E.A.L. - Reversible, Energy minimal, Altered appearance, No new substance.
Term
What is a Physical Change?
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Term
Example of a reversible change?
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A change that affects one or more physical properties of a substance without altering its chemical composition.
A change that can be undone or reversed, returning the substance to its original form.
The process of energy being absorbed or released during a change.
Physical changes are alterations that do not create new substances and are typically reversible.
Physical changes involve transformations where no new substance is formed, such as melting or boiling. These changes affect physical properties and are often reversible.
Physical changes are defined as alterations in a substance that do not produce a new substance. Unlike chemical changes, where new substances are formed with different properties, physical changes concern only the physical aspects such as shape, size, color, or state (solid, liquid, gas). Key characteristics of physical changes include the temporary nature of the alteration, the potential for reversal, and minimal energy release.
Through simple activities, such as observing the melting of ice or the boiling of water, we see first-hand how these changes occur and conclude that they are indeed physical changes.