Element, Compound, Mixture - 6th

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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 different elements are chemically bonded 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. Each substance retains its own properties. Examples include salad and air.

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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 dissolved.

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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. An example is a bowl of cereal, where the different components can be seen.

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

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What is an example of a compound?

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An example of a compound is carbon dioxide (CO2), which is made of carbon and oxygen.

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What is an example of a homogeneous mixture?

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An example of a homogeneous mixture is vinegar, which has a consistent composition throughout.

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What is an example of a heterogeneous mixture?

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An example of a heterogeneous mixture is a fruit salad, where the different fruits can be seen and separated.

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What happens when elements combine to form a compound?

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When elements combine to form a compound, they undergo a chemical reaction, resulting in a new substance with different properties.