Classification of Matter Review

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What is a chemical change?

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A chemical change is a process where substances transform into different substances with new chemical properties, such as rusting iron or bleaching hair.

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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, such as melting ice.

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Define an element.

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An element is a pure substance that cannot be broken down into simpler substances by chemical means, consisting of only one type of atom.

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Define a compound.

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A compound is a substance formed when two or more elements chemically bond together in fixed proportions, such as water (H2O).

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What is a mixture?

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A mixture is a combination of two or more substances that retain their individual properties and can be separated by physical means.

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture that has a uniform composition throughout, such as saltwater.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture where the components are not uniformly distributed, such as a salad or dirt.

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What is the difference between a mixture and a compound?

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A mixture is a physical combination of substances that can be separated, while a compound is a chemical combination of substances that cannot be separated by physical means.

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What is an example of a chemical change?

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An example of a chemical change is the rusting of iron, where iron reacts with oxygen to form iron oxide.

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What is an example of a physical change?

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An example of a physical change is ice melting into water, where the substance remains H2O.