Physical/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 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. It involves a chemical reaction and the rearrangement of atoms. Examples include burning, rusting, and reacting with acid.

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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 chemical identity. Examples include color, melting point, boiling point, and conductivity.

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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. Examples include flammability and reactivity.

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What happens when butter melts?

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When butter melts, it undergoes a physical change from solid to liquid without changing its chemical composition.

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What does it mean if a substance is flammable?

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If a substance is flammable, it means it can easily catch fire and burn. This is a chemical property.

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What occurs when baking soda reacts with vinegar?

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When baking soda reacts with vinegar, a chemical change occurs, producing carbon dioxide gas, water, and sodium acetate.

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What is the significance of gasoline burning?

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Gasoline burning is a chemical change that releases energy in the form of heat and light, resulting in new substances such as carbon dioxide and water.

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How does copper conduct electricity?

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Copper conducts electricity due to its physical property of having free-moving electrons that allow electric current to flow.

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What is an example of a physical change in everyday life?

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An example of a physical change is ice melting into water.