M1 Review Chemical and Physical Changes

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What is a chemical change?

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A chemical change is a process where substances transform into different substances with new chemical properties, often involving a reaction that alters the molecular structure.

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition, such as changes in state, shape, or size.

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Example of a chemical change: Ripening of bananas.

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The ripening of bananas involves a chemical change as the fruit undergoes a transformation in its chemical composition, resulting in a change in color and taste.

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Example of a physical change: Breaking glass.

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Breaking glass is a physical change because it alters the shape and size of the glass without changing its chemical structure.

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What happens during the combustion of LPG?

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The combustion of Liquefied Petroleum Gas (LPG) is a chemical change as it reacts with oxygen to produce carbon dioxide and water, releasing energy.

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Is melting ice a chemical or physical change?

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Melting ice is a physical change because it changes from solid to liquid without altering its chemical composition (H2O remains H2O).

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What is an indicator of a chemical change?

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Indicators of a chemical change include color change, gas production, temperature change, and the formation of a precipitate.

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What is an indicator of a physical change?

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Indicators of a physical change include changes in state (solid, liquid, gas), shape, or size without any change in chemical composition.

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Can a physical change be reversed?

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Many physical changes can be reversed, such as freezing and melting, but some may not be easily reversible, like breaking glass.

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Can a chemical change be reversed?

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Chemical changes are often not reversible by simple physical means, as they result in the formation of new substances.