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 a heterogeneous mixture?

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A heterogeneous mixture is one in which the components are not uniformly distributed, and different parts of the mixture can be seen.

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What is a homogeneous mixture?

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A homogeneous mixture is one in which the components are evenly distributed, and it appears uniform throughout.

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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. It consists of only one type 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 chemically bond together in fixed proportions.

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What is the smallest unit of matter?

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The smallest unit of matter is an atom, which is the basic building block of all substances.

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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 physical combination of substances that retain their individual properties.

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Can a mixture be separated into its components?

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Yes, mixtures can be separated into their individual components by physical means, such as filtration or distillation.

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What is an example of a heterogeneous mixture?

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