Question 1

In the zinc-blende structure (ZnS),the cations occupy half the tetrahedral holes.True or false?

Accepted Answer

In the zinc-blende structure, each anion is tetrahedrally coordinated to four cations, while each cation is tetrahedrally coordinated to four anions. Therefore, the cations occupy half of the tetrahedral holes in the structure.

Question 2

Match between columns Premises: The boiling point of cis-dichloroethene is higher than that of trans-dichloroethene Sodium salts are commonly hydrated. Helium can be liquefied. NH₃ has a higher boiling point than PH₃.

Accepted Answer

The Answer of London dispersion and hydrogen bonding and ion-dipole is...

Question 3

Sodium has a body-centered cubic unit cell.If the atomic radius of sodium is 190 pm,what is the density of sodium?

Accepted Answer

The answer of Sodium has a body-centered cubic unit cell.If...

Question 4

Which of the following has the highest molar enthalpy of vaporization?

Accepted Answer

LiBr (Lithium Bromide) has the highest molar enthalpy of vaporization among the options given. This is because LiBr is an ionic compound, and ionic compounds typically have high enthalpies of vaporization due to the strong electrostatic forces (ionic bonds) that must be overcome to convert them from liquid to gas.

Question 5

In the rock-salt structure (NaCl),the cations occupy all the octahedral holes.True or false?

Accepted Answer

In the rock-salt structure, the cations (Na+) occupy all the octahedral holes, while the anions (Cl-) occupy all the tetrahedral holes.

Question 6

In the unit cell of CaF₂,half of the tetrahedral holes are occupied by F^- ions.True or false?

Accepted Answer

The unit cell of CaF₂ has a face-centered cubic crystal structure. In this structure, there are two types of voids or holes: tetrahedral holes and octahedral holes. The statement in the question only mentions the occupation of half of the tetrahedral holes, but it does not provide any information about the occupancy of the octahedral holes. Therefore, it is not possible to determine whether the statement is true or false.

Question 7

Which of the following has the largest value of surface tension?

Accepted Answer

Hg (mercury) has the largest surface tension among the given options. This is due to its metallic bonding, which results in a very cohesive liquid state, leading to a high surface tension compared to molecular substances.

Question 8

Which of the following ions forms only anhydrous salts?

Accepted Answer

The answer of Which of the following ions forms only...

Question 9

A new material will be recognized as a metal if

Accepted Answer

Metals typically have electrical conductivity that decreases with increasing temperature due to the increased scattering of electrons by phonons (vibrations of the lattice). This is a characteristic behavior of metals, distinguishing them from insulators or semiconductors, where the conductivity might increase with temperature.

Question 10

Which of the following compounds is likely to adopt the cesium chloride structure?

Accepted Answer

The answer of Which of the following compounds is likely...

Question 11

Isotropic liquids have viscosities that are the same in every direction.True or false?

Accepted Answer

Isotropic liquids have the same physical properties in all directions, including viscosity.

Question 12

If a cubic unit cell of an ionic compound has A cations at the corners and the face centers and X anions in the centers of the edges,what is the empirical formula of the compound?

Accepted Answer

The answer of If a cubic unit cell of an...

Question 13

When the cations and anions of an ionic compound have very different radii,the compound usually adopts the rock-salt structure.True or false?

Accepted Answer

When the cations and anions have very different radii, the ionic compound usually adopts the rock-salt structure. This is because the rock-salt structure allows for the closest packing of ions and minimizes the repulsion between ions of like charge.

Question 14

Order the following cubic unit cells from highest percentage of empty space to lowest: body-centered,primitive,face-centered.

Accepted Answer

The primitive cubic unit cell has the highest percentage of empty space, followed by the body-centered cubic, and the face-centered cubic has the least empty space.

Question 15

Gold has a face-centered cubic unit cell.If the edge length of the unit cell is 407 pm,what is the atomic radius of gold?

Accepted Answer

The answer of Gold has a face-centered cubic unit cell.If...

Quiz 6: Liquids and Solids

In the zinc-blende structure (ZnS),the cations occupy half the tetrahedral holes.True or false?

Match each statement with the intermolecular force mainly responsible for the phenomenon.

Sodium has a body-centered cubic unit cell.If the atomic radius of sodium is 190 pm,what is the density of sodium?

Which of the following has the highest molar enthalpy of vaporization?

In the rock-salt structure (NaCl),the cations occupy all the octahedral holes.True or false?

In the unit cell of CaF₂,half of the tetrahedral holes are occupied by F^- ions.True or false?

Which of the following has the largest value of surface tension?

Which of the following ions forms only anhydrous salts?

A new material will be recognized as a metal if

Which of the following compounds is likely to adopt the cesium chloride structure?

Isotropic liquids have viscosities that are the same in every direction.True or false?

If a cubic unit cell of an ionic compound has A cations at the corners and the face centers and X anions in the centers of the edges,what is the empirical formula of the compound?

When the cations and anions of an ionic compound have very different radii,the compound usually adopts the rock-salt structure.True or false?

Order the following cubic unit cells from highest percentage of empty space to lowest: body-centered,primitive,face-centered.

Gold has a face-centered cubic unit cell.If the edge length of the unit cell is 407 pm,what is the atomic radius of gold?

Quiz 6: Liquids and Solids

In the zinc-blende structure (ZnS),the cations occupy half the tetrahedral holes.True or false?

Match each statement with the intermolecular force mainly responsible for the phenomenon.

Sodium has a body-centered cubic unit cell.If the atomic radius of sodium is 190 pm,what is the density of sodium?

Which of the following has the highest molar enthalpy of vaporization?

In the rock-salt structure (NaCl),the cations occupy all the octahedral holes.True or false?

In the unit cell of CaF2,half of the tetrahedral holes are occupied by F- ions.True or false?

Which of the following has the largest value of surface tension?

Which of the following ions forms only anhydrous salts?

A new material will be recognized as a metal if

Which of the following compounds is likely to adopt the cesium chloride structure?

Isotropic liquids have viscosities that are the same in every direction.True or false?

If a cubic unit cell of an ionic compound has A cations at the corners and the face centers and X anions in the centers of the edges,what is the empirical formula of the compound?

When the cations and anions of an ionic compound have very different radii,the compound usually adopts the rock-salt structure.True or false?

Order the following cubic unit cells from highest percentage of empty space to lowest: body-centered,primitive,face-centered.

Gold has a face-centered cubic unit cell.If the edge length of the unit cell is 407 pm,what is the atomic radius of gold?

In the unit cell of CaF₂,half of the tetrahedral holes are occupied by F^- ions.True or false?