# Question 2 the empty space that exists within a

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Question 2The empty space that exists within a crystal and surrounds the host species is called ______ .(A) interstitial space(B) vacancies(C) phase boundaries(D) substitutional impurities(E) dislocationACorrect!Correct!
BCDE1 / 1 ptsQuestion 3The ability of ________ to move is a critical factor that contributes to a given metal's mechanicalbehavior.
1 / 1 ptsQuestion 4For polycrystalline materials, crystal structure and chemical composition are preserved across agrain boundary, whereas the crystal structure and/or chemical composition vary across a phaseboundary.
12/6/2018Quiz 09 - Defects: Mat E 273
3/83 / 3 ptsQuestion 6Compute the concentration (count per volume) of vacancies in copper at room temperature if thelattice parameter of FCC copper is 0.3615 nm at room temperature (25C, 298 K), and theo
3 / 3 ptsQuestion 5Compute theatomic density(the number of atoms per cm...rather than the mass densityg/cm) for a perfect crystal of silicon at room temperature, given that the room temperaturedensity and atomic weight of silicon are 2.33 g/cmand 28.09 g/mol, respectively.Be sure to use values exactly as given and do not round until the final answer.Use 6.022x10, exactly, for Avogadro's Number.(Soon I'll stop reminding you, but you can always go to the Quiz Info page to referenceconversions and constants.)Be sure to use values exactly as given and do not round until the final answer.Use 6.022x10, exactly, for Avogadro's Number.33323
Hint:An alternative way to solve this problem is to count the number of atoms within the unit cell (youdid this on Quiz 05 for the APF of the diamond cubic structure).Dividing this count of atoms by the volume they occupy (the unit cell volume) yields the value weare interested in here (atoms / cm).The lattice parameter of silicon is 5.431 Å.Be sure you can compute this value using both approaches.35e+22Correct!Correct!Correct AnswersCorrect Answers

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