ENGENIEURI
nmc122_SemTest1_2004

The following is a material with a predominantly

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The following is a material with a predominantly covalent character: LiCl Co GaAs BaO 4. Die volgende material is oorwegend nie-kristallyn: / The following material is predominantly non-crystalline: Grafiet Sink Sout Graphite Zinc Salt Diamant Geelkoper Polietileen Diamond Brass Polyethylene 5. Die eenheidsel afmeting a is ‘n afmeting waar: / The unit cell dimension a is a dimension where: die kristalstruktuur elektries neutral is the crystal structure is electrically neutral die kristalstruktuur die digste gepak is the crystal structure has the densest packing die potensiële energie tussen atome of ione ‘n minimum is the potential energy between atoms or ions is a minimum die potensiële energie tussen atome of ione nul is the potential energy between atoms or ions is zero 6. Die verskil tussen ‘n KVG en ‘n HDG kristalstruktuur is nl. dat: The difference between a FCC and a HCP crystal structure is as a result of: hulle APF verskil die planêre digthede van die diggepakste vlakke verskil a difference in APF a difference in the planer density of close packed planes hulle koördinasiegetalle verskil die pakkingsvolgorde van die diggepakste vlakke verskil a difference in coordination number a difference in packing sequence of close packed planes 7. Die volgende is nie waar vir die vlakke (110) en (011) nie: The following is not true for the planes (110) and (011): die vlakke is beide deel van die {110} familie van vlakke the planes are both members of the {110} family of planes die vlakke sny mekaar the planes intercept each other die planêre atomiese digtheid vir albei vlakke is dieselfde vir die kubiese eenheidselle the planer atomic density for both planes for a cubic unit cell are the same die vlakke is die diggepakste vlakke in KVG materiale the planes are the closest packed planes in FCC material 8. Allotropie (polimorfisme) is die verskynsel dat: / Allotropy (polymorfism) is the phenomena that: ‘n material verskillende chemiese samestellings by verskillende temperature het a material has different chemical compositions at different temperatures ‘n materiaal geen kristalstruktuur bevat nie a material has no crystal structure ‘n element in die vaste fase toestand verskillende kristalstrukture kan hê an element in the solid phase can have different crystal structures
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3 ‘n materiaal ondergaan ‘n omkeerbare faseverandering met verandering in temperatuur en druk a material shows a reversible phase change with change in temperature and pressure 9. ‘n Interstisiële vaste oplossing sal vorm indien: / An interstitial solid solution will form if: die radius verskil groter as + 15% is the radius difference larger is than + 15%
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