Question 1

The following questions refer to the phase diagram below. 
-What phase should this substance exist as, at a pressure of 2000 torr and a temperature of 20°C?

Accepted Answer

A) solid 
B) liquid 
C) gas 
D) supercritical fluid 
E) unable to tell

Question 2

A unit cell of sodium chloride (face-centered cubic)consists of sodium and chloride ions. How many chloride ions are present in entirety within just one sodium chloride unit cell?

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
E) 4

Question 3

Which set of properties below best describes solid ionic crystalline substances?

Accepted Answer

A) broad range of melting points, soft to hard, conductors in liquid and solid states 
B) high melting points, brittle, nonconductors 
C) high melting points, hard, not brittle, nonconductors 
D) low melting points, soft, nonconductors 
E) low melting points, soft, conductors in liquid and solid states

Question 4

The critical temperature of a substance is

Accepted Answer

A) always higher than the triple point temperature. 
B) the temperature below which it cannot exist in the liquid state. 
C) the temperature which is always higher than the Kelvin point. 
D) the temperature below which it cannot be liquefied by increasing the pressure. 
E) the temperature below which it cannot be supercooled.

Question 5

1,3,6,8-Tetramethylnaphthlene is a white crystalline solid which is very soft, has a low melting point, and is a nonconductor of electricity. Which category of substance does it most likely fit under?

Accepted Answer

A) ionic 
B) molecular 
C) metallic 
D) covalent (network) 
E) amorphous

Question 6

The following questions refer to the basic phase diagram below with gas, liquid, and solid phases present and labeled. 
-Above ________ °C, it is not possible for a liquid phase of this substance to exist.

Accepted Answer

The answer of The following questions refer to the basic...

Question 7

The following questions refer to the diagram below. 
-At what temperatures do the normal boiling and freezing points occur for this substance?

Accepted Answer

The answer of The following questions refer to the diagram...

Question 8

A unit cell of sodium chloride (face-centered cubic)consists of sodium and chloride ions. How many sodium ions are present in entirety within just one sodium chloride unit cell?

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
E) 4

Question 9

p-Xylene, C8H10, has an enthalpy of fusion of 158.3 J g-1 and its melting point temperature is 13.2°C. How much heat is required to transform 115 g of solid p-xylene at 13.2°C into liquid p-xylene, also at 13.2°C?

Accepted Answer

A) 1.52 kJ 
B) 2.09 kJ 
C) 18.2 kJ 
D) 32.9 kJ 
E) 41.8 kJ

Question 10

Which set of properties below best describes metallic substances?

Accepted Answer

A) broad range of melting points, soft to hard, conductors in liquid and solid states 
B) high melting points, brittle, nonconductors 
C) high melting points, hard, not brittle, nonconductors 
D) low melting points, soft, nonconductors 
E) low melting points, soft, conductors in liquid and solid states

Question 11

Which of the following substances has the lowest boiling point? N₂, CCl₄, CH₃Cl, Cl₂, H₂O

Accepted Answer

The answer of Which of the following substances has the...

Question 12

Which covalent compound will exhibit hydrogen bonding in the liquid state?

Accepted Answer

A) CH2F2 
B) Cl2NH 
C) H2PCl 
D) HBr 
E) NCl3

Question 13

Which causes surface tension?

Accepted Answer

A) more molecules present on a surface than within a liquid 
B) a liquid forming as much surface area as possible 
C) surface molecules having fewer molecular neighbors than interior molecules 
D) a higher viscosity within a liquid than at the surface of a liquid 
E) the largest average size molecules moving toward the surface of a liquid

Question 14

When a gas is below its critical temperature, application of sufficient pressure will cause the gas to become a liquid.

Accepted Answer

A) True 
 B)False

Question 15

One of the solid forms of iron, called $\alpha$-iron, crystallizes in a body-centered cubic lattice. If atomic planes of this form of iron are separated by 143.3 pm, at what angle would you find the first-order (n = 1)diffraction of 0.209 nm X-rays from these planes?

Accepted Answer

A) 43.2° 
B) 21.4° 
C) 23.4° 
D) 0.817° 
E) 46.8°

Question 16

A solid with a molecular weight of 148.0 g/mol is already at its melting point. If 18.6 g of this solid requires 4.838 kJ of heat to melt it, what is the molar heat of fusion (in kJ/mol)?

Accepted Answer

A) 1.33 × 104 kJ/mol 
B) 0.608 kJ/mol 
C) 569 kJ/mol 
D) 0.0260 kJ/mol 
E) 38.4 kJ/mol

Question 17

Helium atoms do not combine to make diatomic helium molecules (He₂), but He atoms do have a weak ________ intermolecular attraction to each other.

Accepted Answer

The answer of Helium atoms do not combine to make...

Question 18

The atomic planes in a graphite crystal are separated by 335 pm. At what angle would you find the second-order (n = 2)diffraction of 0.154 nm X-rays from a graphite crystal?

Accepted Answer

The answer of The atomic planes in a graphite crystal...

Question 19

Crystals tend to have flat surfaces of particles that meet at angles characteristic of the substance. The particles may be

Accepted Answer

A) atoms only. 
B) molecules or atoms, only. 
C) atoms or ions, only. 
D) molecules or ions, only. 
E) molecules, atoms or ions.

Question 20

Which compound cannot be liquefied by compression, at a temperature of 25.0°C?

Accepted Answer

A) CH3Cl, critical point: 144.0°C, 66.0 atm 
B) C2H2, critical point: 35.5°C, 61.6 atm 
C) C2H6, critical point: 32.2°C, 48.2 atm 
D) SiF4, critical point: -14.1°C, 36.7 atm 
E) SO2, critical point: 158.0°C, 78.0 atm

Exam 12: Intermolecular Attractions and the Properties of Liquids and Solids

The following questions refer to the phase diagram below. -What phase should this substance exist as, at a pressure of 2000 torr and a temperature of 20°C?

A unit cell of sodium chloride (face-centered cubic) consists of sodium and chloride ions. How many chloride ions are present in entirety within just one sodium chloride unit cell?

Which set of properties below best describes solid ionic crystalline substances?

The critical temperature of a substance is

1,3,6,8-Tetramethylnaphthlene is a white crystalline solid which is very soft, has a low melting point, and is a nonconductor of electricity. Which category of substance does it most likely fit under?

The following questions refer to the basic phase diagram below with gas, liquid, and solid phases present and labeled. -Above ________ °C, it is not possible for a liquid phase of this substance to exist.

The following questions refer to the diagram below. -At what temperatures do the normal boiling and freezing points occur for this substance?

A unit cell of sodium chloride (face-centered cubic) consists of sodium and chloride ions. How many sodium ions are present in entirety within just one sodium chloride unit cell?

p-Xylene, C₈H₁₀, has an enthalpy of fusion of 158.3 J g^-1 and its melting point temperature is 13.2°C. How much heat is required to transform 115 g of solid p-xylene at 13.2°C into liquid p-xylene, also at 13.2°C?

Which set of properties below best describes metallic substances?

Which of the following substances has the lowest boiling point? N₂, CCl₄, CH₃Cl, Cl₂, H₂O

Which covalent compound will exhibit hydrogen bonding in the liquid state?

Which causes surface tension?

When a gas is below its critical temperature, application of sufficient pressure will cause the gas to become a liquid.

One of the solid forms of iron, called $\alpha$ -iron, crystallizes in a body-centered cubic lattice. If atomic planes of this form of iron are separated by 143.3 pm, at what angle would you find the first-order (n = 1) diffraction of 0.209 nm X-rays from these planes?

A solid with a molecular weight of 148.0 g/mol is already at its melting point. If 18.6 g of this solid requires 4.838 kJ of heat to melt it, what is the molar heat of fusion (in kJ/mol) ?

Helium atoms do not combine to make diatomic helium molecules (He₂), but He atoms do have a weak ________ intermolecular attraction to each other.

The atomic planes in a graphite crystal are separated by 335 pm. At what angle would you find the second-order (n = 2)diffraction of 0.154 nm X-rays from a graphite crystal?

Crystals tend to have flat surfaces of particles that meet at angles characteristic of the substance. The particles may be

Which compound cannot be liquefied by compression, at a temperature of 25.0°C?

Exam 12: Intermolecular Attractions and the Properties of Liquids and Solids

The following questions refer to the phase diagram below. -What phase should this substance exist as, at a pressure of 2000 torr and a temperature of 20°C?

A unit cell of sodium chloride (face-centered cubic) consists of sodium and chloride ions. How many chloride ions are present in entirety within just one sodium chloride unit cell?

Which set of properties below best describes solid ionic crystalline substances?

The critical temperature of a substance is

1,3,6,8-Tetramethylnaphthlene is a white crystalline solid which is very soft, has a low melting point, and is a nonconductor of electricity. Which category of substance does it most likely fit under?

The following questions refer to the basic phase diagram below with gas, liquid, and solid phases present and labeled. -Above ________ °C, it is not possible for a liquid phase of this substance to exist.

The following questions refer to the diagram below. -At what temperatures do the normal boiling and freezing points occur for this substance?

A unit cell of sodium chloride (face-centered cubic) consists of sodium and chloride ions. How many sodium ions are present in entirety within just one sodium chloride unit cell?

p-Xylene, C8H10, has an enthalpy of fusion of 158.3 J g-1 and its melting point temperature is 13.2°C. How much heat is required to transform 115 g of solid p-xylene at 13.2°C into liquid p-xylene, also at 13.2°C?

Which set of properties below best describes metallic substances?

Which of the following substances has the lowest boiling point? N2, CCl4, CH3Cl, Cl2, H2O

Which covalent compound will exhibit hydrogen bonding in the liquid state?

Which causes surface tension?

When a gas is below its critical temperature, application of sufficient pressure will cause the gas to become a liquid.

One of the solid forms of iron, called α\alphaα -iron, crystallizes in a body-centered cubic lattice. If atomic planes of this form of iron are separated by 143.3 pm, at what angle would you find the first-order (n = 1) diffraction of 0.209 nm X-rays from these planes?

A solid with a molecular weight of 148.0 g/mol is already at its melting point. If 18.6 g of this solid requires 4.838 kJ of heat to melt it, what is the molar heat of fusion (in kJ/mol) ?

Helium atoms do not combine to make diatomic helium molecules (He2), but He atoms do have a weak ________ intermolecular attraction to each other.

The atomic planes in a graphite crystal are separated by 335 pm. At what angle would you find the second-order (n = 2)diffraction of 0.154 nm X-rays from a graphite crystal?

Crystals tend to have flat surfaces of particles that meet at angles characteristic of the substance. The particles may be

Which compound cannot be liquefied by compression, at a temperature of 25.0°C?

p-Xylene, C₈H₁₀, has an enthalpy of fusion of 158.3 J g^-1 and its melting point temperature is 13.2°C. How much heat is required to transform 115 g of solid p-xylene at 13.2°C into liquid p-xylene, also at 13.2°C?

Which of the following substances has the lowest boiling point? N₂, CCl₄, CH₃Cl, Cl₂, H₂O

One of the solid forms of iron, called $\alpha$ -iron, crystallizes in a body-centered cubic lattice. If atomic planes of this form of iron are separated by 143.3 pm, at what angle would you find the first-order (n = 1) diffraction of 0.209 nm X-rays from these planes?

Helium atoms do not combine to make diatomic helium molecules (He₂), but He atoms do have a weak ________ intermolecular attraction to each other.