Elements, Compounds, Mixtures

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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), oxygen (O), 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 ammonia (NH3).

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. Examples include air (a mixture of gases) and salad (a mixture of vegetables).

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How can you identify a compound from a particle diagram?

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A compound is represented by a particle diagram showing two or more different types of atoms bonded together in fixed ratios.

Tags

NGSS.MS-PS1-1

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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

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What is the difference between a compound and a mixture?

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

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What is the chemical symbol for hydrogen?

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The chemical symbol for hydrogen is H.

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What is brass classified as?

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Brass is classified as a mixture because it is made by combining zinc and copper without a chemical reaction.

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What is the chemical formula for sodium bicarbonate?

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The chemical formula for sodium bicarbonate is NaHCO3, which is a compound.

Tags

NGSS.MS-PS1-1

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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.