Physical and Chemical 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 changes in state, shape, or size.

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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 alters the chemical composition of the original substance.

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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. It describes the substance's ability to undergo changes that transform it into different substances.

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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, melting point, and density.

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What happens during the evaporation of water?

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During evaporation, water changes from a liquid to a gas (water vapor) without changing its chemical composition. This is a physical change.

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What is an example of a chemical property?

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Flammability is an example of a chemical property, as it describes a substance's ability to burn in the presence of oxygen.

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What occurs when wood burns?

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When wood burns, it undergoes a chemical change, producing new substances such as ash, smoke, and gases, while releasing energy in the form of heat and light.

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What is the significance of a solid forming when two liquids are mixed?

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The formation of a solid when two liquids are mixed indicates a chemical change, often resulting from a chemical reaction that produces a precipitate.

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How can you identify a physical change?

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A physical change can be identified if the change is reversible and does not produce new substances. Examples include melting, freezing, and dissolving.

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How can you identify a chemical change?

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A chemical change can be identified by indicators such as color change, temperature change, gas production, or the formation of a precipitate.