chemistry

Question 1

ionic compound

Answer 1

They are hard and brittle, they are not malleable or ductile (i.e. cannot be shaped without cracking/breaking), and they do not conduct electricity
High melting points.

Question 2

covalent

Answer 2

Low boiling points and melting points.
Various colors.
Poor conductors of heat and electricity.
Brittle solids.

Question 3

metallic

Answer 3

Metallic compounds are;
Strong
Ductile
Malleable 
Conductive of heat and electricity