Element, Compound or Mixture

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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 chemically bond together. For example, water (H2O) is a compound made of hydrogen and oxygen.

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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 salad, air, and sand.

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How can you separate a mixture?

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You can separate a mixture using physical methods such as filtration, evaporation, or magnetism.

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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 bonded, while a mixture consists of two or more substances that are not chemically bonded.

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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 that does not have a uniform composition, such as a salad or a bowl of cereal.

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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.

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What is an example of a chemical change?

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An example of a chemical change is rust forming on iron when it reacts with oxygen.

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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.