4)
Chemical research that is directed toward a practical goal is called

chemical knowledge

Explanation:

The pursuit of chemical knowledge for its own sake, no set goal Applied chemistry Research that is directed toward a practical goal or application, geared toward a specific goal

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.