Why do scientists often use melting point and boiling point to identify substances?

melting and boiling points for substances can aid in production, manipulation, molding, and setting of products. It can also be useful in knowing safety information.

Explanation:

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the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3