Physical and Chemical properties and changes.

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What is a Chemical Change?

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A process where substances combine or break apart to form new substances with different properties. Example: Burning wood.

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What is a Physical Change?

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A change that affects one or more physical properties of a substance without altering its chemical composition. Example: Melting ice into water.

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What is a Physical Property?

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A characteristic of a substance that can be observed or measured without changing its identity. Example: Hardness.

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What is a Chemical Property?

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A characteristic of a substance that describes its ability to change into different substances. Example: Flammability.

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What happens during the Burning of Wood?

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It is a Chemical Change where wood reacts with oxygen to produce ash, smoke, and gases.

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What happens during the Melting of Ice?

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It is a Physical Change where ice changes from solid to liquid without changing its chemical structure.

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What is Folding Origami an example of?

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It is a Physical Change as it involves changing the shape of paper without altering its chemical composition.

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What occurs during the Explosion of Fireworks?

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It is a Chemical Change where chemical reactions produce light, sound, and gas.

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Define Hardness in terms of Physical Properties.

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Hardness is a measure of a material's resistance to deformation or scratching.

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What is the difference between Physical and Chemical Changes?

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Physical Changes do not alter the chemical composition, while Chemical Changes result in new substances.