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In a chemical change, we form an entirely new substance.

In a physical change, we do not form a substance.

Physical changes only occur when matter changes state.

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Discussion Questions before the lesson on Thursday

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Discussion Questions before the lesson on Thursday

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How are chemical changes different from physical changes?

Is toasting a piece of bread an example of a physical or chemical change?

When the banana, berries, water, and hot dog are blended, does a physical or chemical change occur? Why?

Is water evaporating an example of a physical or chemical change?

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What Are Chemical Changes?

It's a brisk fall evening and you are huddled around the camp fire with your friends and family for warmth. You hold a stick with a marshmallow on it into the edge of the fire, letting the marshmallow get brown and gooey. Your mom is roasting hot dogs over the fire, while your dad is opening and shaking HotHands hand warmers for each of you to hold. On this perfect evening, chemical changes are happening all around you.

A chemical change is any change that causes a new substance to be formed. For example, when the camp fire has burned completely out, what's left behind? Ashes! Ash is a new substance formed due to the burning of another substance, wood. This is a chemical change. The roasting of the marshmallow is also a chemical change.

The marshmallow gets a brown, crusty substance on the outside of it from roasting over the fire. This new substance on the marshmallow is evidence of a chemical change. Actually, all changes caused by cooking food in any way are chemical changes. How about the hand warmers your dad was opening and shaking? They represent a chemical change as well. When you shake the hand warmers, chemicals mix inside of the packages, creating a new (warm) substance.

Chemical Properties

There is a common property in all the chemical changes we discussed - not only has a new substance been created, but the change has created heat. There are several chemical properties that help you determine if a chemical change is taking place or not, and one of those is heat, whether the substance is giving off or taking in the heat. Here's a list of other properties that let you know that a chemical change has occurred:

Light

An explosion

A loud bang or pop (like with fireworks and gunshots)

Fizzing or bubbling

Color change

Corrosion

Rusting

Tarnishing

Substance cannot be changed back to its original substance

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chemical change lesson for kids: definition & examples - video & lesson transcript | study.com

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Chemical Change Lesson for Kids: Definition & Examples - Video & Lesson Transcript | Study.com

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It's a brisk fall evening and you are huddled around the camp fire with your friends and family for warmth. You hold a stick with a marshmallow on it into the edge of the fire, letting the marshmallow get brown and gooey.

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Chemical Change Activity - DIY Secret Message Writer

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Learn how to use a chemical change to create a secret message! This activity requires only everyday items and helps kids understand the difference between chemical and physical changes.