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, oxygen, and gold.

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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. An example is water (H2O), which is made of hydrogen and oxygen.

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. Mixtures can be homogeneous (uniform composition) or heterogeneous (distinct components).

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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. An example is saltwater, where the salt is evenly distributed.

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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. An example is a salad, where you can see the different ingredients.

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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 composed of two hydrogen atoms and one oxygen atom.

Tags

NGSS.MS-PS1-1

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What does 'Pure Substance' mean?

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A pure substance is a material that has a constant composition and consistent properties throughout. Examples include elements and compounds.

Tags

NGSS.MS-PS1-4

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What is Granite classified as?

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Granite is classified as a heterogeneous mixture because it contains different minerals that can be seen and identified.

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What is the difference between a Compound and a Mixture?

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

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Can elements be broken down into simpler substances?

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No, elements cannot be broken down into simpler substances by chemical means.

Tags

NGSS.MS-PS1-5