Question 1

The number of nearest neighbors (atoms that make contact)around each atom in a face-centered cubic lattice of a metal is

Accepted Answer

In a face-centered cubic (FCC) lattice, each atom has 12 nearest neighbors. This is because, in addition to the six nearest neighbors in the same cubic layer, each atom also contacts four atoms in the layer above and four in the layer below, totaling twelve.

Question 2

The atomic planes in a graphite crystal are separated by 335 pm. At what angle would you find the first-order (n = 1)diffraction of 0.154 nm X-rays from a graphite crystal?

Accepted Answer

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

Question 3

MgO has the same crystal structure as NaCl, face-centered cubic.How many oxide ions surround each Mg²⁺ ion as nearest neighbors?

Accepted Answer

The answer of MgO has the same crystal structure as...

Question 4

The triple point of iodine is at 0.12 atm and 115°C. Thus, liquid I₂

Accepted Answer

The answer of The triple point of iodine is at...

Question 5

Vanadium crystallizes in a body-centered cubic lattice, and the length of the edge of a unit cell is 305 pm. What is the density of V?

Accepted Answer

Vanadium has a body-centered cubic lattice, meaning there are 2 atoms per unit cell. The atomic mass of vanadium is approximately 50.94 g/mol. The volume of the unit cell is (305 pm)^3 = 2.835 x 10^-23 cm^3. Using the formula density = mass/volume, and converting the mass of 2 atoms of vanadium to grams, the density is calculated to be approximately 5.96 g/cm^3.

Question 6

The number of atoms in a face-centered cubic unit cell is

Accepted Answer

In a face-centered cubic (FCC) unit cell, there are 8 corner atoms, each of which is shared among 8 unit cells, contributing 1/8th of an atom per cell, and 6 face-centered atoms, each shared between 2 cells, contributing 1/2 an atom per cell. This gives a total of (8*(1/8)) + (6*(1/2)) = 1 + 3 = 4 atoms per unit cell.

Question 7

Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm³. What is the radius of the platinum atom?

Accepted Answer

The answer of Platinum has a face-centered cubic crystal structure...

Question 8

The zincblende structure of ZnS has the relatively large sulfide ions arranged at the lattice points of a face-centered cubic structure. The edge length of this cubic unit cell is 540.9 pm.Determine the density of zincblende.

Accepted Answer

The answer of The zincblende structure of ZnS has the...

Question 9

Potassium bromide, KBr, crystallizes like NaCl in a face-centered lattice. The ionic radii of K⁺ and Br^- ions are 133 pm and 195 pm, respectively. Assuming that all Br^- ions are positioned in the face and corners of the unit cell, while the K⁺ ions are positioned along the edge alternating between anions, calculate the length of a unit cell edge.

Accepted Answer

The answer of Potassium bromide, KBr, crystallizes like NaCl in...

Question 10

A liquid boils when its

Accepted Answer

According to the definition of boiling, it is a phase change when a liquid transforms to a gas. This occurs when the vapor pressure of the liquid is equal to or greater than the external pressure pushing on it. Therefore, choice B is the best option, as the vapor pressure is the only factor mentioned that determines if a liquid will boil. The other choices, such as A and C, do not necessarily lead to boiling as they do not take into account the external pressure, and D is not specific enough to be the correct answer.

Question 11

The mineral manganosite, manganese(II)oxide, crystallizes in the rock salt structure (the face-centered structure adopted by NaCl)with a density of 5.365 g/cm³. Find the unit cell edge length of manganosite.

Accepted Answer

The density of a crystal is given by:$$ho = \frac{ZM}{a^3N_A}$$where $ho$ is the density, $Z$ is the number of formula units per unit cell, $M$ is the molar mass, $a$ is the unit cell edge length, and $N_A$ is Avogadro's number.For manganosite, $Z = 4$, $M = 86.94 g/mol$, and $ho = 5.365 g/cm^3$. Substituting these values into the equation, we get:$$5.365 g/cm^3 = \frac{4 	imes 86.94 g/mol}{a^3 	imes 6.022 	imes 10^{23} mol^{-1}}$$Solving for $a$, we get:$$a = 444.5 pm$$

Question 12

Palladium crystallizes in a face-centered cubic unit cell. Its density is 12.0 g/cm³ at 27°C.Calculate the atomic radius of Pd.

Accepted Answer

Given data:
Density of palladium at 27°C = 12.0 g/cm³
We know that,

Density (ρ) = (Z × M)/NA × a³

Where, 
Z = 4 (for FCC unit cell)
M = molar mass of Pd = 106.4 g/mol
NA = Avogadro number = 6.022 × 10²³ mol⁻¹
a = edge length of the unit cell

Putting values in the above equation, we get:

a = [(4 × 106.4)/(12.0 × 6.022 × 10²³)]^(1/3) 
a = 3.890 Å

Now, we have to find the atomic radius, which can be calculated as half of the edge length of the unit cell.

Atomic radius of Pd = a/2
Atomic radius of Pd = 3.890/2 = 1.945 Å = 194.5 pm ≈ 138 pm

Therefore, the correct answer is A) 138 pm.

Question 13

Which of the following is not an endothermic process?

Accepted Answer

Condensation of water vapor is an exothermic process, as it releases heat when water vapor condenses into liquid water. The other options listed are all endothermic processes, as they require energy input to occur.

Question 14

The heat capacity of liquid water is 4.18 J/g·°C and the heat of vaporization is 40.7 kJ/mol. How many kilojoules of heat must be provided to convert 1.00 g of liquid water at 67°C into 1.00 g of steam at 100°C?

Accepted Answer

The answer of The heat capacity of liquid water is...

Question 15

Use the graph of vapor pressure to determine the normal boiling point of CHCl₃.

Accepted Answer

The normal boiling point occurs when the vapor pressure equals the atmospheric pressure of 760 mmHg. Therefore, we can find the normal boiling point by reading the graph where the vapor pressure is 760 mmHg. From the graph, we can see that the vapor pressure of CHCl₃ is 760 mmHg at approximately 64°C. Therefore, the answer is D, 64°C.

Question 16

The specific heat of liquid ethanol, C₂H₅OH(l), is 2.46 J/g·°C and the heat of vaporization is 39.3 kJ/mol.The boiling point of ethanol is 78.3 °C.What amount of enthalpy is required to heat 50.0 g of liquid ethanol from 23.0 °C to ethanol vapor at 78.3 °C?

Accepted Answer

The answer of The specific heat of liquid ethanol, C₂H₅OH(l),...

Question 17

Use the graph of vapor pressure to determine the normal boiling point of O₂.

Accepted Answer

The answer of Use the graph of vapor pressure to...

Question 18

Silver metal crystallizes in a face-centered cubic lattice with L as the length of one edge of the unit cube. The center-to-center distance between nearest silver atoms is

Accepted Answer

The answer of Silver metal crystallizes in a face-centered cubic...

Question 19

Potassium crystallizes in a body-centered cubic lattice.How many atoms are there per unit cell?

Accepted Answer

In a body-centered cubic lattice, there is one atom at each corner and one atom at the center of the cube. Thus, there are 2 atoms per unit cell.

Question 20

Acetic acid has a heat of fusion of 10.8 kJ/mol and a heat of vaporization of 24.3 kJ/mol.What is the expected value for the heat of sublimation of acetic acid?

Accepted Answer

The heat of sublimation is the sum of the heat of fusion and the heat of vaporization. Therefore, 10.8 kJ/mol + 24.3 kJ/mol = 35.1 kJ/mol.

Quiz 11: Intermolecular Forces and Liquids and Solids

The number of nearest neighbors (atoms that make contact) around each atom in a face-centered cubic lattice of a metal is

The atomic planes in a graphite crystal are separated by 335 pm. At what angle would you find the first-order (n = 1) diffraction of 0.154 nm X-rays from a graphite crystal?

MgO has the same crystal structure as NaCl, face-centered cubic.How many oxide ions surround each Mg²⁺ ion as nearest neighbors?

The triple point of iodine is at 0.12 atm and 115°C. Thus, liquid I₂

Vanadium crystallizes in a body-centered cubic lattice, and the length of the edge of a unit cell is 305 pm. What is the density of V?

The number of atoms in a face-centered cubic unit cell is

Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm³. What is the radius of the platinum atom?

The zincblende structure of ZnS has the relatively large sulfide ions arranged at the lattice points of a face-centered cubic structure. The edge length of this cubic unit cell is 540.9 pm.Determine the density of zincblende.

A liquid boils when its

The mineral manganosite, manganese(II) oxide, crystallizes in the rock salt structure (the face-centered structure adopted by NaCl) with a density of 5.365 g/cm³. Find the unit cell edge length of manganosite.

Palladium crystallizes in a face-centered cubic unit cell. Its density is 12.0 g/cm³ at 27°C.Calculate the atomic radius of Pd.

Which of the following is not an endothermic process?

The heat capacity of liquid water is 4.18 J/g·°C and the heat of vaporization is 40.7 kJ/mol. How many kilojoules of heat must be provided to convert 1.00 g of liquid water at 67°C into 1.00 g of steam at 100°C?

Use the graph of vapor pressure to determine the normal boiling point of CHCl₃.

The specific heat of liquid ethanol, C₂H₅OH(l) , is 2.46 J/g·°C and the heat of vaporization is 39.3 kJ/mol.The boiling point of ethanol is 78.3 °C.What amount of enthalpy is required to heat 50.0 g of liquid ethanol from 23.0 °C to ethanol vapor at 78.3 °C?

Use the graph of vapor pressure to determine the normal boiling point of O₂.

Silver metal crystallizes in a face-centered cubic lattice with L as the length of one edge of the unit cube. The center-to-center distance between nearest silver atoms is

Potassium crystallizes in a body-centered cubic lattice.How many atoms are there per unit cell?

Acetic acid has a heat of fusion of 10.8 kJ/mol and a heat of vaporization of 24.3 kJ/mol.What is the expected value for the heat of sublimation of acetic acid?

Quiz 11: Intermolecular Forces and Liquids and Solids

The number of nearest neighbors (atoms that make contact) around each atom in a face-centered cubic lattice of a metal is

The atomic planes in a graphite crystal are separated by 335 pm. At what angle would you find the first-order (n = 1) diffraction of 0.154 nm X-rays from a graphite crystal?

MgO has the same crystal structure as NaCl, face-centered cubic.How many oxide ions surround each Mg2+ ion as nearest neighbors?

The triple point of iodine is at 0.12 atm and 115°C. Thus, liquid I2

Vanadium crystallizes in a body-centered cubic lattice, and the length of the edge of a unit cell is 305 pm. What is the density of V?

The number of atoms in a face-centered cubic unit cell is

Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm3. What is the radius of the platinum atom?

The zincblende structure of ZnS has the relatively large sulfide ions arranged at the lattice points of a face-centered cubic structure. The edge length of this cubic unit cell is 540.9 pm.Determine the density of zincblende.

A liquid boils when its

The mineral manganosite, manganese(II) oxide, crystallizes in the rock salt structure (the face-centered structure adopted by NaCl) with a density of 5.365 g/cm3. Find the unit cell edge length of manganosite.

Palladium crystallizes in a face-centered cubic unit cell. Its density is 12.0 g/cm3 at 27°C.Calculate the atomic radius of Pd.

Which of the following is not an endothermic process?

The heat capacity of liquid water is 4.18 J/g·°C and the heat of vaporization is 40.7 kJ/mol. How many kilojoules of heat must be provided to convert 1.00 g of liquid water at 67°C into 1.00 g of steam at 100°C?

Use the graph of vapor pressure to determine the normal boiling point of CHCl3.

The specific heat of liquid ethanol, C2H5OH(l) , is 2.46 J/g·°C and the heat of vaporization is 39.3 kJ/mol.The boiling point of ethanol is 78.3 °C.What amount of enthalpy is required to heat 50.0 g of liquid ethanol from 23.0 °C to ethanol vapor at 78.3 °C?

Use the graph of vapor pressure to determine the normal boiling point of O2.

Silver metal crystallizes in a face-centered cubic lattice with L as the length of one edge of the unit cube. The center-to-center distance between nearest silver atoms is

Potassium crystallizes in a body-centered cubic lattice.How many atoms are there per unit cell?

Acetic acid has a heat of fusion of 10.8 kJ/mol and a heat of vaporization of 24.3 kJ/mol.What is the expected value for the heat of sublimation of acetic acid?

MgO has the same crystal structure as NaCl, face-centered cubic.How many oxide ions surround each Mg²⁺ ion as nearest neighbors?

The triple point of iodine is at 0.12 atm and 115°C. Thus, liquid I₂

Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm³. What is the radius of the platinum atom?

The mineral manganosite, manganese(II) oxide, crystallizes in the rock salt structure (the face-centered structure adopted by NaCl) with a density of 5.365 g/cm³. Find the unit cell edge length of manganosite.

Palladium crystallizes in a face-centered cubic unit cell. Its density is 12.0 g/cm³ at 27°C.Calculate the atomic radius of Pd.

Use the graph of vapor pressure to determine the normal boiling point of CHCl₃.

The specific heat of liquid ethanol, C₂H₅OH(l) , is 2.46 J/g·°C and the heat of vaporization is 39.3 kJ/mol.The boiling point of ethanol is 78.3 °C.What amount of enthalpy is required to heat 50.0 g of liquid ethanol from 23.0 °C to ethanol vapor at 78.3 °C?

Use the graph of vapor pressure to determine the normal boiling point of O₂.