lesson 4

Question 1

is a polymer irreversibly hardened by curing from a soft solid or viscous liquid pre-
polymer or resin.

Answer 1

thermoset plastic

Question 2

is a plastic polymer which become more soft when heated and heard when called. They can
be heated and cooled several times without any change in their chemical and mechanical properties.

Answer 2

Thermoplastic

Question 3

typically made of organic polymers and other substances. Usually man made materials derived from
petrochemicals and some renewable materials

Answer 3

Plastic

Question 4

a molecular ion covalently bonded to a set of two or more atoms, or a set of metal complex
and is considered a single unit and the Net Charge is not zero (meaning charged)

Answer 4

Polyatomic Ion

Question 5

molecules which are composed of only two atoms either same element or different
element.

Answer 5

Diatomic Molecule