chemical changes

What defines a chemical change?

• Matter changes its physical state (e.g., solid to liquid).

• Matter transforms into a different substance with new properties.

• Matter changes its shape or size.

• Matter is heated or cooled without changing its composition.

Which of the following is a common indicator of a chemical change?

• A change in the substance's state (e.g., solid to liquid).

• The formation of a new substance.

• A change in the substance's size.

• The substance being cut into smaller pieces.

Which of these everyday occurrences is an example of a chemical change?

• Melting ice into water.

• Cutting an apple into slices.

• Burning wood in a fireplace.

• Boiling water to create steam.

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What is a key characteristic that distinguishes a chemical change from a physical change?

• Chemical changes can always be easily reversed.

• Physical changes always produce a new substance.

• Chemical changes result in a new substance that cannot be easily reversed.

• Physical changes involve a change in the chemical composition of matter.