Pure Substances and Mixtures

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What is a heterogeneous mixture?

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A heterogeneous mixture is a type of mixture where the components are not uniformly distributed, and different parts can be seen and identified. Example: a cheese sandwich.

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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. The different components are not distinguishable. Example: almond milk.

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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. Example: iron (Fe) nail.

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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. Example: water (H2O).

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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. Mixtures can be homogeneous or heterogeneous.

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Is sand a pure substance or a mixture?

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Sand is a heterogeneous mixture because it consists of different particles that can be seen and separated.

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Is a soft drink a pure substance or a mixture?

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A soft drink is a mixture because it contains various ingredients that are not chemically combined.

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What distinguishes a pure substance from a mixture?

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

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Can a homogeneous mixture be separated by physical means?

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No, homogeneous mixtures cannot be easily separated by physical means because their components are uniformly distributed.

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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.