Classification of Matter - Review

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What is a Homogeneous Mixture?

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A homogeneous mixture is a mixture in which the composition is uniform throughout. Examples include solutions like saltwater or Kool-Aid.

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What are Mixtures?

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Mixtures are combinations of two or more substances that are not chemically combined. Examples include sweet tea, lemonade, and whole milk.

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What are Compounds?

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Compounds are substances made from two or more elements that are chemically combined in fixed proportions. Examples include water (H2O) and carbon dioxide (CO2).

Tags

NGSS.MS-PS1-1

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What is a Chemical Change?

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A chemical change occurs when a substance transforms into a new substance with different properties. Examples include rusting iron and burning wood.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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Why is a mixture not a compound?

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A mixture is not a compound because mixtures are not always in fixed proportions, while compounds are.

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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. Examples include hydrogen (H) and oxygen (O).

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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 ice and boiling water.

Tags

NGSS.MS-PS1-4

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What is a Heterogeneous Mixture?

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A heterogeneous mixture is a mixture in which the composition is not uniform throughout. Examples include salad and sand mixed with pebbles.

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What is the difference between a Compound and a Mixture?

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A compound is a substance formed when two or more elements are chemically bonded together, while a mixture is a combination of substances that retain their individual properties.

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What is a Solution?

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A solution is a homogeneous mixture where one substance (the solute) is dissolved in another (the solvent). Examples include sugar in water.