Review Materials Chemistry part 2

Which of these fibers are the strongest gram for gram?

• fiberglass

• wool

• cotton

• silk

The silk comes from the ___ of the larvae of the silkworm

• cocoon

• hair

• stem

• scales

The silk worms are fed ____ during their larval stage

• corn

• meat

• mulberry leaves

• bamboo leaves

To remove the silk fibers for processing

• the larva must be boiled

• small combs are used to remove the silk

• asbestos fibers replace the silk fibers

• the larva shed the silk covering

Asbestos fibers are 'mutagens'. What does this mean?

• they can be eaten because they contain a lot of protein

• they cause changes in the DNA sequence of cells and can lead to cancer

• they change to different fibers

• they are not good insulators

The term 'asbestosis' refers to

• damage to the skin caused by scratching on asbestos

• scarring of the lungs caused by breathing asbestos

• a lack of nutritional value in the food we eat

• damage to the hair follicles causing the hair to be thin and brittle

Fiberglass is often used in homes for

• insulation

• making glass

• improving soil quality

• strengthening the wood used to build houses

Silk is mainly composed of which polymer?

• cellulose

• protein

• lipids

• glycogen

Anything that has mass and takes up volume is

• energy

• matter

• radiation

• force