True or false (If the statement is false correct so that it is true) polyethylen

Question

True or false (If the statement is false correct so that it is true) polyethylene is simple polymer that can only be processed in low density, medium density and high density forms a perfect metal crystal would exhibit ductile behavior amorphous crystals have long range order a vacancy of point defect that occurs when an atom is missing from lattice position geckos are able to cling and run across atomically smooth surfaces due to hydrogen bonds metal tends to be harder than polymers ceramics tend to be stronger than polymers and metals tend to be harder than ceramics H bonding is very important bond type in biological material such as water and DNA Melting and re-solidification is very important process in sintering the anamalous freezing behavior of water is due to ionic covalent bonding

Explanation / Answer

1. true, polythene is classified by its density and branching, there are low density polythene( LDPE), MDPE,HDPE.

2. true, metal crytsal is ductile because of easily breakable local bonds.

3. false, amorphous crystal is solid in which there is no long range order charecteristic of crystal.

4.true, a vacancy is point defect that occurs when an atom missing from lattice site

5.true, due to hydrogen bonding an dipole moment Geckos have extremley climbing action

6.true,ceramics are stronger than metal and plastics , these are brittle also.

7. false, in DNA there is peptide bond.

8.false.sintering involes without melting

9.. false., due to intermolecular hydrogen bonding

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