Differentiating Chemical and Physical Changes

The video tutorial explains the differences between chemical and physical changes. It uses examples like burning wood and cooking food to illustrate chemical changes, where new substances are formed. In contrast, examples like cutting hair and crushing a can demonstrate physical changes, where the substance remains the same. The video concludes by summarizing that chemical changes result in new substances, while physical changes do not.

What happens to wood when it is burned?

• It remains the same as before.

• It becomes a gas.

• It becomes a new substance called ash.

• It turns into water.

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Which of the following is an example of a chemical change?

• Cooking food

• Melting ice

• Breaking glass

• Cutting paper

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What is a characteristic of a physical change?

• It does not create a new substance.

• It always involves heat.

• It creates a new substance.

• It changes the chemical composition.

What happens when you cut your hair?

• It becomes a new substance.

• It remains chemically the same.

• It turns into ash.

• It changes color.

Which statement is true about chemical changes?

• They do not create new substances.

• They only occur at high temperatures.

• They result in new substances.

• They are always reversible.

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