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 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 includes processes like burning, rusting, and digestion.

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What are physical properties?

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Physical properties are characteristics of a substance that can be observed or measured without changing the substance's identity. Examples include color, melting point, and density.

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What are chemical properties?

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Chemical properties describe a substance's ability to undergo changes that transform it into different substances. Examples include flammability, reactivity with acids, and oxidation states.

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What is an example of a physical change?

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Crumpling paper is an example of a physical change because it alters the shape but not the chemical composition of the paper.

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What is an example of a chemical change?

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Rusting of iron is an example of a chemical change because it involves a reaction with oxygen that produces a new substance (iron oxide).

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What indicates a chemical reaction has occurred?

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Signs of a chemical reaction include the formation of a gas, color change, temperature change, and the formation of a precipitate.

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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 is the difference between physical and chemical properties?

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

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What happens during a chemical change?

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During a chemical change, the bonds between atoms are broken and new bonds are formed, resulting in the creation of new substances.