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 substance retains its own properties. Mixtures can be homogeneous or heterogeneous.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture in which the components are not uniformly distributed and can be easily distinguished, such as sand and iron filings.

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture in which the components are uniformly distributed and cannot be easily distinguished, such as salt water.

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What is an element?

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An element is a pure substance that consists of only one type of atom and cannot be broken down into simpler substances.

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What is a compound?

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A compound is a pure substance formed when two or more different types of atoms chemically bond together.

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Give an example of a compound.

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An example of a compound is sodium chloride (table salt), which is made of sodium and chlorine atoms.

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What is the difference between a pure substance and a mixture?

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A pure substance has a uniform and definite composition, while a mixture consists of two or more substances that retain their individual properties.

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What happens when Kool-Aid powder is mixed with water?

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When Kool-Aid powder is mixed with water, it forms a mixture where the components are not chemically bonded.

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Is salt water a pure substance or a mixture?

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Salt water is a homogeneous mixture because it contains dissolved salt and water, which can be separated.