What is pure substance ?? I don't understand

1.	What is pure substance ?? I don't understand
Answer» Answer + Explanation: A pure substance is a form of matter that has a CONSTANT composition and properties that are constant throughout the sample. MIXTURES are physical combinations of two or more ELEMENTS and/or compounds. Mixtures can be classified as homogeneous or heterogeneous.

Answer»

Answer + Explanation:

A pure substance is a form of matter that has a CONSTANT composition and properties that are constant throughout the sample. MIXTURES are physical combinations of two or more ELEMENTS and/or compounds. Mixtures can be classified as homogeneous or heterogeneous.

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What is pure substance ?? I don't understand​

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What is pure substance ?? I don't understand