Physical and Chemical Properties and Changes

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What is a physical property?

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A physical property is a characteristic of a substance that can be observed or measured without changing its identity. Examples include color, density, melting point, and boiling point.

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What is a chemical property?

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A chemical property describes a substance's ability to undergo a specific chemical change. Examples include reactivity with oxygen, acidity, and tarnishing.

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What happens to a substance during a physical change?

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During a physical change, the substance changes its physical properties (like shape or state) but remains the same substance. Examples include melting ice or dissolving sugar in water.

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What happens to a substance during a chemical change?

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During a chemical change, the substance transforms into one or more different substances. This involves breaking and forming chemical bonds. Examples include rusting iron or burning wood.

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What is density?

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Density is the mass of a substance divided by its volume. It is a physical property that helps identify substances.

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What is 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 of a substance.

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What is the boiling point?

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The boiling point is the temperature at which a liquid turns into a gas. It is a physical property of a substance.

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What is hardness?

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Hardness is a measure of how resistant a material is to scratching or denting. It is a physical property.

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What is tarnishing?

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Tarnishing is a chemical change that occurs when a metal reacts with sulfur or oxygen in the air, resulting in a dull coating.

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What are examples of physical changes?

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Examples of physical changes include melting ice, boiling water, and breaking glass.