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question 1

For each of the cubic cells (simple cubic, body-centered cubic, and face-centered cubic) give the coordination number, edge length in terms of r

, and number of atoms per unit cell.

Drag the appropriate items to their respective bins.

two atoms in the unit cell

a coordination number of 8

a coordination number of 6

an edge length of 4r/3

-


one atom in the unit cell

an edge length of 2r


a coordination number of 12

an edge length of 22

-

r


  • four atoms in the unit cell

one atom in the unit cell Selected

  • Simple cubic cell
  • Body-centered cubic cell
  • Face-centered cubic cell

question 2

Niobium has a density of 8.57g/cm

3.

 and crystallizes with a body-centered cubic unit cell.

ICalculate the radius of a niobium atom


question3


The density of an unknown metal is 12.3g/cm

3

and its atomic radius is 0.134nm

. It has a face-centered cubic lattice.Find the atomic mass of this metal.

question 4


Qualitatively estimate the relative melting points for each of the solids, and rank them in decreasing order.

Rank from highest to lowest melting point. To rank items as equivalent, overlap them.

  • silica
  • solid ammonia
  • calcium chloride

question5

In the following pairs of solids, which one has the higher melting point?

Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer.

  • Fe(s)
  • F e ( s )
  • KCl(s)
  • K C l ( s )
  • H
  • 2
  • O(s)
  • H Subscript2 O ( s )
  • CCl
  • 4
  • (s)
  • C C l Subscript4 ( s )
  • Ti(s)
  • T i ( s )
  • Ne(s)
  • N e ( s )
  • HCl(s)
  • H C l ( s )
  • H
  • 2
  • S(s)
  • For the pair of compound Ti(s)
  • or Ne(s)
  • the one with the higher melting point is  
  • For the pair of compound T i ( s ) or N e ( s ) the one with the higher melting point is blank.
  • .
  • For the pair of compound H
  • 2
  • O(s)
  • or H
  • 2
  • S(s)
  • the one with the higher melting point is  
  • For the pair of compound H 2 O ( s ) or H 2 S ( s ) the one with the higher melting point is blank.
  • .
  • For the pair of compound Fe(s)
  • or CCl
  • 4
  • (s)
  • the one with the higher melting point is  
  • For the pair of compound F e ( s ) or C C l 4 ( s ) the one with the higher melting point is blank.
  • .
  • For the pair of compound KCl(s)
  • or HCl(s)
  • the one with the higher melting point is 

question6

What are the coordination numbers of Li

+

and S

2−

in the lithium sulfide crystal shown? Enter the values in order of Li

+

and S

2−

, respectively.

Enter two integers separated by commas.

What is the density of Li

2

S

in grams per cubic centimeter?

Express your answer to three significant figures and include the appropriate units.

Rank the elements aluminum, sodium, and phosphorus in order of decreasing conductivity.

  • Rank from most to least conductive. To rank items as equivalent, overlap them.
  • Al
  • P
  • Na

Most conductive


Least conductive

question 7


In the context of a silicon-based semiconductor, match each of the following descriptions to the type of semiconductor.

Drag each item to the appropriate bin


1-n-Type semiconductors

2-p-Type semiconductors.

question 8



  • contains extra electrons

  • contains electron holes
  • dopant: boron
  • dopant: phosphorus

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