Question 1

The following questions refer to the phase diagram below. Gas, liquid, and solid phases are all present, but not labeled. 
-Starting at the temperature and pressure of c, if the pressure is increased at constant temperature, ultimately

Accepted Answer

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

Question 2

The following questions refer to the phase diagram below. 
-What phase should this substance exist as, at a pressure of 1500 torr and a temperature of -20°C?

Accepted Answer

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

Question 3

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

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

Question 4

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 -70°C?

Accepted Answer

The triple point of the substance is at -56.6°C and 5.1 torr. At a pressure of 2000 torr and a temperature of -70°C, the substance is in the solid phase.

Question 5

The following questions refer to the phase diagram below. 
-Which of the following values of temperature and pressure most closely correspond to the triple point of this substance?

Accepted Answer

The triple point of a substance is the unique set of conditions at which all three phases (solid, liquid, and gas) coexist in equilibrium. For many substances, including common ones like carbon dioxide, the triple point occurs at a specific low temperature and pressure. The values given in option C (-57°C and 740 torr) are close to the known triple point conditions for carbon dioxide.

Question 6

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

Accepted Answer

C2H4 cannot be liquefied by compression at 25.0°C because its critical temperature is 9.9°C, which is lower than 25.0°C.

Question 7

The critical temperature of a substance is

Accepted Answer

The answer of The critical temperature of a substance is
...

Question 8

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

Accepted Answer

SiF₄ has a critical temperature of -14.1°C, which is below 25.0°C. Therefore, it cannot be liquefied by compression at 25.0°C.

Question 9

The normal boiling point of acetic acid, HC₂H₃O₂, is 117.9°C, and its heat of vaporization is 39,690 J/mol. What is its vapor pressure at 100.0°C?

Accepted Answer

The Clausius-Clapeyron equation can be used to calculate the vapor pressure of a liquid at a given temperature:ln(P2/P1) = -ΔHvap/R * (1/T2 - 1/T1)where P1 and T1 are the known vapor pressure and temperature, P2 is the unknown vapor pressure, T2 is the new temperature, ΔHvap is the heat of vaporization, and R is the gas constant.Plugging in the given values:ln(P2/760 torr) = -39,690 J/mol / (8.314 J/mol*K) * (1/373.15 K - 1/393.15 K)Solving for P2:P2 = 423.2 torrTherefore, the vapor pressure of acetic acid at 100.0°C is 423.2 torr.

Question 10

Find the boiling temperature at 760 torr of an isomer of octane, C₈H₁₈, if its heat of vaporization is 38,210 J mol^-1 and its vapor pressure at 110.0°C is 638.43 torr.

Accepted Answer

The answer of Find the boiling temperature at 760 torr...

Question 11

Hexane (C₆H₁₄)boils at 68.73°C at 760 torr. The heat of vaporization for hexane is28.9 kJ/mol. What is the vapor pressure of hexane at 30°C?

Accepted Answer

The vapor pressure can be calculated using the Clausius-Clapeyron equation. Given the boiling point, heat of vaporization, and temperature change, the vapor pressure at 30°C is approximately 207 torr.

Question 12

The normal boiling point of 2,3,4-trimethypentane, C₈H₁₈, is 113.47°C, and its heat of vaporization is 37,600 J mol^-1. What is its vapor pressure at 105.5°C?

Accepted Answer

Using the Clausius-Clapeyron equation, the vapor pressure at 105.5°C is calculated to be approximately 594.1 torr.

Question 13

Portions of how many different atoms are in one simple cubic unit cell?

Accepted Answer

In a simple cubic unit cell, there is one atom at each of the eight corners. Each corner atom is shared by eight adjacent unit cells, so each corner contributes 1/8th of an atom to the unit cell. Therefore, the total number of atoms in a simple cubic unit cell is 8 corners x 1/8 = 1 atom.

Question 14

Which type of lattice structures have lattice points on all of the faces?

Accepted Answer

Face-centered cubic structures have lattice points on all of the faces of the cube, in addition to the corners.

Question 15

Which type of unit cell has lattice points at each corner, and one in the center of the cell?

Accepted Answer

A body-centered cubic (BCC) unit cell has lattice points at each corner of the cube and one additional lattice point at the center of the cube.

Question 16

In a one-element solid with a face-centered cubic structure, how many atoms are in one unit cell?

Accepted Answer

In a face-centered cubic (FCC) structure, there are 8 corner atoms, each shared by 8 unit cells, and 6 face atoms, each shared by 2 unit cells. This results in a total of 4 atoms per unit cell.

Question 17

In a one-element solid with a simple cubic crystal structure, how many atoms are in one unit cell?

Accepted Answer

In a simple cubic crystal structure, each unit cell contains one atom at each of its eight corners. Since each corner atom is shared by eight unit cells, only 1/8 of each corner atom is counted for each unit cell. Therefore, each unit cell contains 1/8 * 8 = 1 atom.

Question 18

A new compound, boganium sulfide, has been discovered. X-ray crystallographic studies reveal that it has a cubic unit cell with a sulfide ion at each of the corner lattice points, a sulfide ion at the geometric center of the unit cell, and a boganium ion in the center of each of the cube faces in the unit cell. Based on this structure, the formula for the compound should be

Accepted Answer

The unit cell contains 1 sulfide ion at the center, 1 sulfide ion from the corners (8 corners x 1/8), and 3 boganium ions from the faces (6 faces x 1/2), giving the formula Bo₃S₂.

Question 19

What type of crystal lattice is found in a sample of table salt, NaCl?

Accepted Answer

Table salt, NaCl, forms a face-centered cubic (FCC) lattice structure where each sodium ion is surrounded by six chloride ions and vice versa, creating a cubic arrangement.

Question 20

How many atoms are contained in one unit cell of metallic tungsten, if it forms a face-centered cubic unit cell?

Accepted Answer

In a face-centered cubic (FCC) unit cell, there are 4 atoms per unit cell. This is because each corner atom is shared by 8 unit cells and each face-centered atom is shared by 2 unit cells.

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

The following questions refer to the phase diagram below. Gas, liquid, and solid phases are all present, but not labeled. -Starting at the temperature and pressure of c, if the pressure is increased at constant temperature, ultimately

The following questions refer to the phase diagram below. -What phase should this substance exist as, at a pressure of 1500 torr and a temperature of -20°C?

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?

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 -70°C?

The following questions refer to the phase diagram below. -Which of the following values of temperature and pressure most closely correspond to the triple point of this substance?

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

The critical temperature of a substance is

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

The normal boiling point of acetic acid, HC₂H₃O₂, is 117.9°C, and its heat of vaporization is 39,690 J/mol. What is its vapor pressure at 100.0°C?

Find the boiling temperature at 760 torr of an isomer of octane, C₈H₁₈, if its heat of vaporization is 38,210 J mol^-1 and its vapor pressure at 110.0°C is 638.43 torr.

Hexane (C₆H₁₄) boils at 68.73°C at 760 torr. The heat of vaporization for hexane is28.9 kJ/mol. What is the vapor pressure of hexane at 30°C?

The normal boiling point of 2,3,4-trimethypentane, C₈H₁₈, is 113.47°C, and its heat of vaporization is 37,600 J mol^-1. What is its vapor pressure at 105.5°C?

Portions of how many different atoms are in one simple cubic unit cell?

Which type of lattice structures have lattice points on all of the faces?

Which type of unit cell has lattice points at each corner, and one in the center of the cell?

In a one-element solid with a face-centered cubic structure, how many atoms are in one unit cell?

In a one-element solid with a simple cubic crystal structure, how many atoms are in one unit cell?

What type of crystal lattice is found in a sample of table salt, NaCl?

How many atoms are contained in one unit cell of metallic tungsten, if it forms a face-centered cubic unit cell?

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

The following questions refer to the phase diagram below. Gas, liquid, and solid phases are all present, but not labeled. -Starting at the temperature and pressure of c, if the pressure is increased at constant temperature, ultimately

The following questions refer to the phase diagram below. -What phase should this substance exist as, at a pressure of 1500 torr and a temperature of -20°C?

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?

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 -70°C?

The following questions refer to the phase diagram below. -Which of the following values of temperature and pressure most closely correspond to the triple point of this substance?

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

The critical temperature of a substance is

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

The normal boiling point of acetic acid, HC2H3O2, is 117.9°C, and its heat of vaporization is 39,690 J/mol. What is its vapor pressure at 100.0°C?

Find the boiling temperature at 760 torr of an isomer of octane, C8H18, if its heat of vaporization is 38,210 J mol-1 and its vapor pressure at 110.0°C is 638.43 torr.

Hexane (C6H14) boils at 68.73°C at 760 torr. The heat of vaporization for hexane is28.9 kJ/mol. What is the vapor pressure of hexane at 30°C?

The normal boiling point of 2,3,4-trimethypentane, C8H18, is 113.47°C, and its heat of vaporization is 37,600 J mol-1. What is its vapor pressure at 105.5°C?

Portions of how many different atoms are in one simple cubic unit cell?

Which type of lattice structures have lattice points on all of the faces?

Which type of unit cell has lattice points at each corner, and one in the center of the cell?

In a one-element solid with a face-centered cubic structure, how many atoms are in one unit cell?

In a one-element solid with a simple cubic crystal structure, how many atoms are in one unit cell?

What type of crystal lattice is found in a sample of table salt, NaCl?

How many atoms are contained in one unit cell of metallic tungsten, if it forms a face-centered cubic unit cell?

The normal boiling point of acetic acid, HC₂H₃O₂, is 117.9°C, and its heat of vaporization is 39,690 J/mol. What is its vapor pressure at 100.0°C?

Find the boiling temperature at 760 torr of an isomer of octane, C₈H₁₈, if its heat of vaporization is 38,210 J mol^-1 and its vapor pressure at 110.0°C is 638.43 torr.

Hexane (C₆H₁₄) boils at 68.73°C at 760 torr. The heat of vaporization for hexane is28.9 kJ/mol. What is the vapor pressure of hexane at 30°C?

The normal boiling point of 2,3,4-trimethypentane, C₈H₁₈, is 113.47°C, and its heat of vaporization is 37,600 J mol^-1. What is its vapor pressure at 105.5°C?