Question 1

Iron has a body-centered cubic unit cell,and a density of 7.87 g/cm3.Calculate the edge length of the unit cell,in pm.(The atomic mass of iron is 55.85 amu.Also,1 amu = 1.661 $\times$ 10-24g. )

Accepted Answer

The answer of Iron has a body-centered cubic unit cell,and...

Question 2

Examine the following phase diagram and identify the feature represented by point B.

Accepted Answer

A)  melting point
B)  triple point
C)  critical point
D)  sublimation point
E)  boiling pointF) A) and B)
G) B) and D)

Question 3

Which one of the following substances does not exist in the indicated solid type?

Accepted Answer

A)  graphite - network
B)  Na - metallic
C)  SiO2 - molecular
D)  NaCl - ionic
E)  diamond - networkF) C) and D)
G) B) and E)

Question 4

Which of the following pairs is arranged with the particle of higher polarizability listed first?

Accepted Answer

A)  CCl4,CI4
B)  H2O,H2Se
C)  C6H14,C4H10
D)  NH3,NF3
E)  None of these choices is correct.F) A) and B)
G) A) and C)

Question 5

The energy needed to increase the surface area of a liquid is

Accepted Answer

A)  capillary action.
B)  surface tension.
C)  viscosity.
D)  cohesion.
E)  specific elasticity.F) A) and E)
G) D) and E)

Question 6

The highest temperature at which superconductivity has been achieved is approximately

Accepted Answer

A)  4 K
B)  30 K
C)  70 K
D)  100 K
E)  130 KF) A) and D)
G) C) and D)

Question 7

Of the five major types of crystalline solid,which would you expect each of the following to form? (e.g. ,H2O: molecular)
a.Sn
b.Si
c.KCl
d.Xe
e.F2

Accepted Answer

a.metallic
b.network...

Question 8

Strontium metal crystallizes in a cubic unit cell which has an edge length of 612 pm.If the mass of an atom of Sr is 87.62 amu,and the density of Sr metal is 2.54 g/cm3,calculate the number of atoms per unit cell.(1 amu = 1.661 $\times$ 10-24 g. )

Accepted Answer

The answer of Strontium metal crystallizes in a cubic unit...

Question 9

Liquid ammonia (boiling point = -33.4°C) can be used as a refrigerant and heat transfer fluid.How much energy is needed to heat 25.0 g of NH3(l) from -65.0°C to -12.0°C? 3(l) from -65.0°C to -12.0°C?   A) 5.5 kJ B) 6.3 kJ C) 39 kJ D) 340 kJ E) 590 kJ" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  5.5 kJ
B)  6.3 kJ
C)  39 kJ
D)  340 kJ
E)  590 kJF) B) and C)
G) A) and E)

Question 10

A metal such as chromium in the face-centered cubic lattice will have ________________ atom(s) per unit cell.

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  10F) A) and B)
G) All of the above

Question 11

Which of the following should have the highest surface tension at a given temperature?

Accepted Answer

A)  CH4
B)  CF4
C)  CCl4
D)  CBr4
E)  CI4 F) D) and E)
G) B) and D)

Question 12

The energy gap between the conduction band and the valence band is large for

Accepted Answer

A)  conductors.
B)  semiconductors.
C)  superconductors.
D)  insulators.
E)  alloys.F) All of the above
G) C) and D)

Question 13

Consider the phase diagram shown below.  
a.What phase(s)is/are present at point A?
b.What phase(s)is/are present at point B?
c.Name point C and explain its significance.
d.Starting at D,if the pressure is lowered while the temperature remains constant,describe what will happen.

Accepted Answer

a.liquid
b.solid,liquid and gas
c.C is t...

Question 14

When liquid bromine is cooled to form a solid,which of the following types of solid would it form?

Accepted Answer

A)  atomic
B)  metallic
C)  molecular
D)  ionic
E)  covalent networkF) C) and E)
G) All of the above

Question 15

Draw a fully labeled phase diagram (P versus T)of a substance whose solid phase can melt due to applied pressure (i.e. ,solid is less dense than liquid).Clearly label the triple point and the critical temperature on your diagram.

Accepted Answer

<img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> A is the triple poi...

Question 16

Ammonia's unusually high melting point is the result of

Accepted Answer

A)  dipole-dipole forces.
B)  London dispersion forces.
C)  hydrogen bonding.
D)  covalent bonding.
E)  ionic bonding.F) A) and C)
G) A) and E)

Question 17

a.State the essential requirements for hydrogen bonding to be important in a compound.
b.List four properties of water which are significantly influenced by the presence of hydrogen bonding.

Accepted Answer

a.The compound must contain hydrogen bon...

Question 18

A metal in the simple cubic lattice will have ________________ atom(s) per unit cell.

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  8F) A) and B)
G) A) and C)

Question 19

Polonium crystallizes in the simple cubic lattice.What is the coordination number for Po?

Accepted Answer

A)  3
B)  4
C)  6
D)  8
E)  12F) B) and D)
G) A) and B)

Question 20

Use molecular orbital band diagrams to explain why metals are good conductors but semiconductors are not.

Accepted Answer

<img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> In metals,the conduction and valence ba...

Exam 12: Intermolecular Forces: Liquids,solids,and Phase Changes

The highest temperature at which superconductivity has been achieved is approximately

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A metal in the simple cubic lattice will have ________________ atom(s) per unit cell.

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a.State the essential requirements for hydrogen bonding to be important in a compound. b.List four properties of water which are significantly influenced by the presence of hydrogen bonding.

Correct Answerverifieda.The compound must contain hydrogen bon...View AnswerShow Answer

Draw a fully labeled phase diagram (P versus T)of a substance whose solid phase can melt due to applied pressure (i.e. ,solid is less dense than liquid).Clearly label the triple point and the critical temperature on your diagram.

Correct Answerverified A is the triple poi...View AnswerShow Answer

Liquid ammonia (boiling point = -33.4°C) can be used as a refrigerant and heat transfer fluid.How much energy is needed to heat 25.0 g of NH3(l) from -65.0°C to -12.0°C?

Correct AnswerverifiedShow Answer

Of the five major types of crystalline solid,which would you expect each of the following to form? (e.g. ,H2O: molecular) a.Sn b.Si c.KCl d.Xe e.F2

Correct Answerverifieda.metallicb.network...View AnswerShow Answer

The energy needed to increase the surface area of a liquid is

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A metal such as chromium in the face-centered cubic lattice will have ________________ atom(s) per unit cell.

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Which one of the following substances does not exist in the indicated solid type?

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Ammonia's unusually high melting point is the result of

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The energy gap between the conduction band and the valence band is large for

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Consider the phase diagram shown below. a.What phase(s)is/are present at point A? b.What phase(s)is/are present at point B? c.Name point C and explain its significance. d.Starting at D,if the pressure is lowered while the temperature remains constant,describe what will happen.

Correct Answerverifieda.liquidb.solid,liquid and gasc.C is t...View AnswerShow Answer

Examine the following phase diagram and identify the feature represented by point B.

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When liquid bromine is cooled to form a solid,which of the following types of solid would it form?

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Strontium metal crystallizes in a cubic unit cell which has an edge length of 612 pm.If the mass of an atom of Sr is 87.62 amu,and the density of Sr metal is 2.54 g/cm3,calculate the number of atoms per unit cell.(1 amu = 1.661 ×\times× 10-24 g. )

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Polonium crystallizes in the simple cubic lattice.What is the coordination number for Po?

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Which of the following pairs is arranged with the particle of higher polarizability listed first?

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Use molecular orbital band diagrams to explain why metals are good conductors but semiconductors are not.

Correct Answerverified In metals,the conduction and valence ba...View AnswerShow Answer

Which of the following should have the highest surface tension at a given temperature?

Correct AnswerverifiedShow Answer

Iron has a body-centered cubic unit cell,and a density of 7.87 g/cm3.Calculate the edge length of the unit cell,in pm.(The atomic mass of iron is 55.85 amu.Also,1 amu = 1.661 ×\times× 10-24g. )

Correct AnswerverifiedShow Answer

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a.The compound must contain hydrogen bon...
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A is the triple poi...
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Liquid ammonia (boiling point = -33.4°C) can be used as a refrigerant and heat transfer fluid.How much energy is needed to heat 25.0 g of NH₃(l) from -65.0°C to -12.0°C?

Correct Answer
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Of the five major types of crystalline solid,which would you expect each of the following to form? (e.g. ,H₂O: molecular) a.Sn b.Si c.KCl d.Xe e.F₂

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a.metallic
b.network...
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a.liquid
b.solid,liquid and gas
c.C is t...
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Strontium metal crystallizes in a cubic unit cell which has an edge length of 612 pm.If the mass of an atom of Sr is 87.62 amu,and the density of Sr metal is 2.54 g/cm³,calculate the number of atoms per unit cell.(1 amu = 1.661 $\times$ 10^-24 g. )

Correct Answer
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Correct Answer
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In metals,the conduction and valence ba...
View Answer

Correct Answer
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Iron has a body-centered cubic unit cell,and a density of 7.87 g/cm³.Calculate the edge length of the unit cell,in pm.(The atomic mass of iron is 55.85 amu.Also,1 amu = 1.661 $\times$ 10^-24g. )

Correct Answer
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