Question 10 Clays are an example of oxide ceramics. o True O False Question 11 What material(s) need(s) to be added to portland cement in order to form concrete? lead aluminum O soda ash sand Question 12 Polymers can be produced in nature, as well as in a chemical laboratory. O True False D Question 13 2 A polymer that eliminates an atom or small group of atoms is known as a(n) condensation polymer O addition polymer dimer copolymer