which one of the following materials can be classified as a metal? a. HgS b.Sn c

Question

which one of the following materials can be classified as a metal?

a. HgS b.Sn c. InAs d.C e.CdS f.Si g.Mgo

Which one of the following statements concerning cross-linking is false?

A) Polymer chains that are cross-linked with only London dispersion forces will be liquids at room temperature.

B) With partial covalent cross-linking (e.g., adding sulfur to natural rubber) a polymer will become rubbery and tough.

C) H-bonding is the type of cross-linking found in biological polymers such as DNA.

D) Covalent cross-linking converts a thermoplastic polymer into a thermoset one.

E) Heavy cross-linking causes a polymer to become stiff, like an epoxy resin or cured silicone.

which is an example of a condensation polymerization

a. styrene----poly(styrene)

b.amino acids----proteins

c.sthylene-----poly(ethylene)

d.molten sulfur-----poly(sulfer)

Explanation / Answer

Answers:

For 1 st Q. - Answer is b.( Sn- Stanus)

For 2 nd Q. - Answer is A.(Polymer chains that are cross-linked with only London dispersion forces will be liquids at room temperature)

For 3 Q. - Answer is b. (amino acids----proteins)

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