1.1 Chemical and physical properties and changes

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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 melting, freezing, and dissolving.

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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. Examples include rusting, burning, and digestion.

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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 the substance's chemical identity. Examples include color, density, and melting point.

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What is a chemical property?

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A chemical property is a characteristic of a substance that becomes evident during a chemical reaction. Examples include reactivity with acids, flammability, and oxidation states.

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What happens to ice when it melts?

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When ice melts, it undergoes a physical change from solid to liquid, but its chemical composition (H2O) remains the same.

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What is solubility?

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Solubility is the ability of a substance to dissolve in a solvent, such as sugar dissolving in water, which is a physical property.

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What is the difference between physical and chemical properties?

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Physical properties can be observed without changing the substance, while chemical properties can only be observed during a chemical reaction.

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What is an example of a physical property of vinegar?

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An example of a physical property of vinegar is that it is a clear liquid with a strong odor.

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What is reactivity with acid?

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Reactivity with acid is a chemical property that describes how a substance reacts when it comes into contact with an acid, such as how metals can corrode.

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What is texture in terms of physical properties?

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Texture refers to the feel or appearance of a surface, such as the softness of a candle that can be scraped with a fingernail.