Classification of 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 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 carbon dioxide (CO2).

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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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What is filtration?

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Filtration is a physical separation method used to separate solids from liquids or gases using a filter. It is commonly used in water purification.

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What is evaporation?

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Evaporation is the process by which liquid turns into vapor, usually when heated. It is a method used to separate a soluble solid from a liquid.

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What is distillation?

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Distillation is a separation technique that involves heating a liquid to create vapor and then cooling the vapor to create a liquid. It is used to purify liquids.

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What is chromatography?

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Chromatography is a technique used to separate mixtures based on the different rates at which components move through a medium. It is often used in chemistry to analyze substances.

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What is a molecule?

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A molecule is the smallest unit of a chemical compound that retains its chemical properties. It is made up of two or more atoms bonded together.

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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 together, while a mixture is a combination of 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. Examples include saltwater and air.