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Ice melts in a glass. A cut apple turns brown. Are these the same kind of change?

This is Chapter 5 in your NCERT book.

Its name is Changes Around Us: Physical and Chemical.

What you will learn

• Physical change — no new substance is made.
• Chemical change — a new substance is made.
• Some changes can be undone. Some cannot. That is a separate question.
• A burning candle has both kinds of change.
• Rocks change slowly, over thousands of years.
• Burning needs fuel, oxygen and heat.
• A chemical change can be written in words.
• Some changes help us. Some harm us.

Need a quick catch-up?

These lessons help. Open one if it feels shaky.

• The same water, three forms (in A Journey through States of Water).
• Does it dissolve? (in Materials Around Us).
• Why iron goes orange (in The World of Metals and Non-metals).

Stay safe

Nothing here asks you to light a flame or taste anything. Your teacher may show some tests. Do not try them at home.