3) True or False (If statement is false, correct it so that it is true) a) A vac

Question

3) True or False (If statement is false, correct it so that it is true) a) A vacancy is a point defect that occurs when an atom is missing from a lattice position. A perfect metal crystal would exhibit ductile behavior. Amorphous crystals have long range order which can be measured by x-ray diffraction. X-ray crystal structure determination and the iridescent colors in nacre, butterfly wings, and beetle exoskeletons are caused by similar phenomena that involves the transmission of visible light. Metals tend to be harder than polymers, ceramics tend to be strongen than polymers, and metals tend to be harder than ceramics. Diamond is a unique material that exhibits metallic bonding. One of its more unusual features is that although it has a very high electrical conductivity, it is a poor conductor of heat. b) H bonding is a very important bond type in biological materials such as water and DNA. H bonding is responsible for the anomalous freezing behavior of water in which its density increases when it transforms from liquid to solid. It also plays a role in explaining why Geckos are able to cling to and run across atomically smooth surfaces. c) The microstructure of a metal sample that has been cooled from a melt would contain very large crystal grains on the interior and very small crystal grains on the exterior surface. This would be caused by differences in the heating rate where the exterior cools more slowly than the interior.

Explanation / Answer

True of false statements

a) True

Vacancy is caused by mixxing of atoms from crystal lattice

b) True

Hydrogen bonding is an important aspect in biological system. It is also responsible for the freezing point displayed by water as solids have more hydrogen bonds compared to liquid water.

c) True

The tendency of crystallization of melt to form microstructures gives the different in crystal grains on the inside and the exterior surface.

d) True

The 100 and 010 planes are perpendicular to each other.

e) true

Polymers such as low density polyethylne are used in a wide variety of biomaterial preparations.

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