Test #1: Plastics and Packaging Concepts

What happens to semi-rigid and rigid plastics after compression?

• They return to their original shape

• They melt and reform

• They do not return to their original shape

• They become soft and flexible

Which statement is true about amorphous polymers?

• They melt and crystallize easily

• They do not melt and do not crystallize

• They are highly rigid

• They are used only for soft plastics

What is a key property of thermoplastics?

• They cannot be melted

• They can be melted and reformed many times

• They burn instead of melting

• They are always amorphous

What does the degree of crystallinity affect in plastics?

• The flexibility

• The clarity

• The melting point

• The cost

Flexible packaging is suitable for which types of contents?

• Only liquids

• Only solids

• Liquids, solids, and semi-solids

• Only gases

What distinguishes addition reactions from condensation reactions?

• Addition reactions form a by-product; condensation reactions do not

• Addition reactions do not form a by-product; condensation reactions do

• Both form by-products

• Neither forms by-products

What is migration in the context of packaging?

• The expansion of plastic when heated

• The transfer of a substance to a product like food or liquid

• The crystallization of polymers

• The melting of thermoplastics

What was the significance of the 1958 Food Additives Amendment?

• It banned all plastics in packaging

• It was the first major law impacting packaging

• It required metallization of polymers

• It outlawed flexible packaging

Which polymer cannot be metallized?

• PET

• LDPE

• EPS

• HDPE

What happens to plastic when it is heated?

• It contracts

• It expands

• It crystallizes

• It becomes rigid