Physical and Chemical Changes and Properties

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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. Examples include changes in size, shape, or state of matter.

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What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and the rearrangement of atoms. Examples include burning, rusting, and digestion.

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What is the difference between physical properties and chemical properties?

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Physical properties can be observed or measured without changing the substance's identity (e.g., color, melting point), while chemical properties describe a substance's ability to undergo a chemical change (e.g., flammability, reactivity).

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What is flammability?

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Flammability is a chemical property that describes how easily a substance can ignite and burn in the presence of oxygen.

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What happens during a physical change?

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During a physical change, the form or appearance of a substance changes, but its chemical composition remains the same.

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What are some examples of physical changes?

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Examples of physical changes include melting ice, boiling water, dissolving sugar in water, and breaking a glass.

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What are some examples of chemical changes?

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Examples of chemical changes include burning wood, rusting iron, and baking a cake.

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What is the significance of the melting point?

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The melting point is the temperature at which a solid becomes a liquid. It is a physical property that can help identify substances.

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What is the significance of boiling point?

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The boiling point is the temperature at which a liquid becomes a gas. It is a physical property that can help identify substances.

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What is meant by 'cutting' as a physical change?

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Cutting is a physical change because it alters the size and shape of a material without changing its chemical composition.