Pure Substances and Mixtures

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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. It can be an element or a compound.

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What is a mixture?

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A mixture is a combination of two or more substances where each retains its own properties. Mixtures can be homogeneous or heterogeneous.

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What is the difference between a homogeneous mixture and a heterogeneous mixture?

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A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture has a non-uniform composition with distinct phases.

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What is an example of a heterogeneous mixture?

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Soil is an example of a heterogeneous mixture, as it contains different components like sand, clay, and organic matter.

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What is an example of a homogeneous mixture?

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Saltwater is an example of a homogeneous mixture, as the salt is completely dissolved in the water, creating a uniform solution.

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What is the process of evaporation?

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Evaporation is the process of turning a liquid into vapor, typically by heating, which leaves behind any dissolved solids.

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What is a bar magnet used for in separation techniques?

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A bar magnet is used to separate magnetic materials, such as iron filings, from non-magnetic materials, like sand.

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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 and is made up of only one kind of atom.

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What is a compound?

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A compound is a pure substance formed when two or more different elements are chemically bonded together.

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What is filtration?

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