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¡¡¡¡£¨1£©Before these metals in their natural state can be converted into useful forms to be of service to man,they must be separated from the other elements or substances with which they are combined. Chemists,who are well acquainted with the properties of metals,have been able to develop processes for separating metals from substances with which they are combined in nature¡­

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¡¡¡¡(2)In Unit 3 we examined briefly the sequence of procedures which make up the so-called scientific method. We are now going to consider a few of the many ways in which a scientist may fall into error while following these procedures.

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