Self Check: Classifying Matter

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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 Oxygen (O), Carbon (C), and Gold (Au).

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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. Examples include Water (H2O) and Sodium Chloride (NaCl).

Tags

NGSS.MS-PS1-1

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What is a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded. The individual substances retain their own properties. Examples include air and salad.

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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. Examples include saltwater and vinegar.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture that does not have a uniform composition and the individual components can be seen. Examples include a salad and a bowl of mixed nuts.

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What distinguishes a compound from a mixture?

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A compound is made of two or more elements that are chemically bonded, while a mixture consists of two or more substances that are physically combined.

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What is the chemical formula for water?

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The chemical formula for water is H2O, indicating it is made of two hydrogen atoms and one oxygen atom.

Tags

NGSS.MS-PS1-1

Front

What is the chemical formula for sodium chloride?

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The chemical formula for sodium chloride is NaCl, indicating it is made of one sodium atom and one chlorine atom.

Tags

NGSS.MS-PS1-1

Front

Which of the following is an example of an element: Oxygen (O), Water (H2O), or Sodium Chloride (NaCl)?

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Oxygen (O) is an example of an element.

Front

What is the difference between an element and a compound?

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An element is a pure substance that cannot be broken down, while a compound is made of two or more elements that are chemically combined.