Which process represents a chemical change? (1) melting of ice(2) corrosion of copper(3) evaporation of water(4) crystallization of sugar

             Corrosion of Copper is a chemical change.

                   Copper like Iron when come in contact with moisture and oxygen oxidized and corrodes according to following equation,

                                             4 Cu  +  O₂    →   2 Cu₂O

This corrosion results in lost of conductivity, strength and luster of copper. As in this reaction two substances i.e Cu and O₂ are reacting to produce a completely new substance i.e. Cu₂O hence, it is declared as chemical change.

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explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.