Suppose you stir a little baking soda into water until the water looks clear again. how could you prove to someone that the clear material is a solution, not a compound?

You could put the solution in a cup and then let the water evaporate. The baking soda will stay in the cup.

Explanation:

This will show that it is a solution not a compound.

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a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.