Element, Compound, Mixtures

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What is an element?

Back

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?

Back

A compound is a substance formed when two or more elements chemically bond together in fixed proportions. Examples include water (H2O) and carbon dioxide (CO2).

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What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. The components retain their individual properties. Examples include air and salad.

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How can mixtures be separated?

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Mixtures can be separated using physical methods such as filtration, distillation, evaporation, and decantation.

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What is filtration?

Back

Filtration is a physical separation method used to separate solids from liquids or gases using a filter medium that allows only the fluid to pass through.

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What is decantation?

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Decantation is a process of separating mixtures by carefully pouring off the liquid, leaving the solid or denser liquid behind.

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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, used to separate components based on different boiling points.

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What is evaporation?

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Evaporation is the process of turning a liquid into vapor, often used to separate a dissolved solid from a liquid.

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What is a pure substance?

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

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Can a compound be broken down into simpler substances?

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Yes, a compound can be broken down into its constituent elements through chemical reactions.