Plastics, Soil and Glass

Plastics are made from

• boron

• polymers

• silicon dioxide

• sand

Sodium carbonate is added to glass for what purpose?

• change the color

• make it set up faster

• lower the melting point

• make it harder

All soil samples are dried for what purpose?

• sterilize the soil

• make it less messy

• find the density

• prevent decomposition

Plastics that are usually transparent and not arranged in any type of order are called what?

• amorphous

• crystalline

• opaque

• thermosets

Which element has been added to pyrex to change its thermal ability?

• lead

• iron

• calcium

• boron

Which of the following does NOT affect the pH of soil?

• carbon dioxide

• density

• water

• temperature

Which of the following plastics cannot be melted and remolded, but is flexible?

• elastomers

• thermosets

• thermoplastics

• resins

Which type of glass is used in shop windows and windshields because it will hold together when broken?

• tempered

• evacuated

• plate

• laminated

Soil that comes from a healthy, thriving lawn will be what?

• high in phosphorus

• high in nitrogen

• acidic

• high in oxygen

About 90% of all manufactured glass is what type?

• soda-lime

• lead-boron

• plate glass

• cylinder glass