Classification of matter/ Lab tools

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What is a compound?

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A compound is a substance formed when two or more elements are chemically bonded together. Example: Water (H2O) is a compound made of hydrogen and oxygen.

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Which of the following is an example of a compound?

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Water is an example of a compound.

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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. Example: Breaking a cracker into pieces.

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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. Example: Rust forming on iron.

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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.

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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. Example: Water freezes at 0 degrees Celsius.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture in which the components are not uniformly distributed and can be easily distinguished. Example: Sand and water.

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture in which the components are uniformly distributed and cannot be easily distinguished. Example: Soluble coffee in water.

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What is the difference between a physical change and a chemical change?

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A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

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What is an element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means. Example: Copper and iron are elements.