Question

Is it always possible to identify something as an element, compound, pure substance or mixture just by looking at it? Explain using examples from the tables. (table attached)

Answer 1

no, as some compounds(such as carbon dioxide and oxygen) are completely transparent, you can not see them and can not distinguish between the two with just the naked eye.

Answer 2

Using, the table given above, one can conclude that, IT IS NOT ALWAYS POSSIBLE TO IDENTIFY A SUBSTANCE AS A COMPOUND, MIXTURE, PURE SUBSTANCE OR AN ELEMENT JUST BY LOOKING AT THEM.

Looking at the table, you will observe that, some of the substances listed under mixtures are actually compounds. That is, combination of hydrogen and oxygen will form water, which is a compound. Also, combination of sodium and chlorine will form sodium chloride, which is a compound.