Chemistry, 06.11.2021 04:30, tearaj

A student is testing a solid material to determine whether it is a pure substance or a mixture. Which observation would MOST likely indicate that the material is a mixture?
The material has crystals of two different colors.
The material does not dissolve completely in water.
The material does not melt when it is heated over a burner.
The material reacts with an acid solution to form bubbles of gas.

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A student is testing a solid material to determine whether it is a pure substance or a mixture. Wh...