Why compound is regarded as a pure substance while the mixture is not?
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Answers
Explanation:
because mixture has been mixed with different compounds
whereas compound is combined of elements they can be separated only by chemical process but mixture can be separated by physical process like filtration,cheomatography etc.
Answer:
In simplest terms, a pure substance is any material that has a fixed chemical composition. That is, the formula unit for that material is always the same. Take water, for example. The chemical formula for water is H2O. Every water molecule has two hydrogen atoms convalently bonded to one oxygen atom. There are other possible combinations of hydrogen and oxygen (more on this in a moment), but those other combinations aren’t water. Whenever we talk about water, we mean molecules that have the fixed formula H2O.
Now let’s be clear — in real life, water is never pure, nor is any other material. Pure substance is a purely theoretical concept that exists for classification purposes only. Imagine taking a tank of water and running it through so many filters and distillation apparatuses that it exceeds even the highest standards of purity used in scientific laboratories. It still wouldn’t be pure, per se, because water does this neat trick where it can react with itself to form species that, technically speaking, aren’t water.
This reaction is known as auto-ionization, and while water isn’t the only molecule that can auto-ionize, it is perhaps the most studied substance to do so because auto-ionization forms the backbone for aqueous acid-base chemistry. I digress. The point is that even in ultra-pure water, there will necessarily be a mixture of ions that aren’t water, and nothing you can do will completely eliminate them.
Explanation: