Yes Baking Powder Is A Pure Substance.
Wheat flour is a mixture of many compounds.
If there is no salt or substance that makes it impure it is a pure mixture
mixture
impure because they are made of more than 1 substance
yes water is mixture of many impure substances and bacteria.even pure water has some bacterias.
it is a mixture
coal is a mixture and impure because it is in crude form. coke and carbon are pure form of matter.
Generally an impure material is cheaper than a pure material; the word advantage is not so adequate here - can use pure or impure, this depends on the specific applications.
If a substance in a mixture is preponderant--, if the amount far exceeds the amounts of the other substances in the mixture it is usually called an impure substance. Resource: Separation of the Components of a Mixture Lab -Chemistry
An aerosol may be pure or an impure material, homogeneous or not.
This depends on the specific application of a material.
The melting point of an impure compound will become closer to that of the actual melting point of the pure substance with recrystallization of your mixture.