Which statement correctly describes diamond and graphite, which are different forms of solid carbon?
(1) they differ in their molecular structure, only.
(2) they differ in their properties, only.
(3) they differ in their molecular structure and properties.
(4) they do not differ in their molecular structure or properties.

Option (3) is the correct answer.

Explanation:

When an element exists in two or more different physical forms then they are known as allotropes.

For example, diamond and graphite are both allotropes of carbon.

In graphite, carbon atoms are joined together in sheets of six sided lattice. Whereas in diamond, carbon atoms are joined together in four cornered lattice.

Therefore, as these allotropes are made up of same element so they have similar chemical properties but different physical properties like melting point, boiling point etc.

Also, both of them have different molecular structure.

Thus, we can conclude that the statement the differ in their molecular structure and properties correctly describes diamond and graphite.

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

: )

c, liquids evaporate, creating a gas