Question 1

Arrange the following in order of increasing boiling point: RbCl, CH₃Cl, CH₃OH, CH₄.

Accepted Answer

The correct order from lowest to highest boiling point is based on molecular weight and intermolecular forces. Methane (CH₄) has the lowest boiling point due to its small size and lack of polarity. Chloromethane (CH₃Cl) has a higher boiling point due to its larger size and dipole-dipole interactions. Methanol (CH₃OH) has an even higher boiling point because of hydrogen bonding. RbCl, being an ionic compound, has the highest boiling point due to the strong ionic bonds.

Question 2

Which property of water allows a razor blade to float on it without sinking?

Accepted Answer

The property of water that allows a razor blade to float on it without sinking is surface tension. Surface tension is the tendency of the molecules at the surface of a liquid to stick together and form a thin film, creating a layer that can support lightweight objects like a razor blade.

Question 3

Choose the response that lists the member of each of the following pairs that has the higher boiling point. (I)H₂O or KI (II)HF or HI (III)Cl₂ or Br₂

Accepted Answer

The answer of Choose the response that lists the member...

Question 4

An example of a covalent network solid is

Accepted Answer

Covalent network solids are characterized by a continuous network of covalent bonds throughout the structure, resulting in high melting points and high hardness. Diamond is a classic example of a covalent network solid, with every carbon atom bonded to four neighboring carbon atoms in a tetrahedral arrangement. Potassium and sodium chloride are ionic solids, while iodine is a molecular solid held together by weak van der Waals forces.

Question 5

Which of the following is not true with regard to water?

Accepted Answer

Ice is less dense than liquid water, which is why it floats. This is due to the hydrogen bonds in ice, which cause the molecules to form a crystal-like lattice structure with more space between them compared to the molecules in liquid water.

Question 6

Butter melts over a range of temperature, rather than with a sharp melting point. Butter is classified as a/an

Accepted Answer

Butter is classified as an amorphous solid because it does not have a sharp melting point and melts over a range of temperatures, indicating a lack of a well-defined crystalline structure.

Question 7

Which one of the following is an example of a covalent network solid?

Accepted Answer

A covalent network solid is a type of solid in which the atoms are held together by a network of covalent bonds. In SiO₂ (silicon oxycarbide), there are covalent bonds between silicon, oxygen, and carbon atoms that create a network structure, making it an example of a covalent network solid. K (potassium) is a metallic solid, I₂ (iodine) is a molecular solid, and CaCl₂ (calcium chloride) is an ionic solid.

Question 8

Krypton has a higher melting point than argon because of its

Accepted Answer

Krypton has stronger dispersion forces than argon due to its larger atomic size and greater number of electrons, resulting in a higher melting point. Hydrogen bonding and permanent dipole moments do not apply to noble gases, and they do not form ionic bonds. While krypton does have a higher ionization energy than argon, this is not the primary factor contributing to its higher melting point.

Question 9

The structural form of the element Ge closely resembles the structure of

Accepted Answer

The structural form of Ge closely resembles diamond, which is a tetrahedral network of interconnected carbon atoms. This is because both carbon and germanium have four valence electrons and form covalent bonds with other atoms in a tetrahedral arrangement.

Question 10

Each of the following substances is a gas at 25°C and 1 atmosphere pressure. Which one will liquefy most easily when compressed at a constant temperature?

Accepted Answer

HF has the lowest boiling point of all the options, indicating that it is the easiest to liquefy. At 1 atm and 25°C, HF is already a gas, so compressing it will cause it to liquefy more easily than the other gases on the list.

Question 11

Which of the following substances would have the highest critical temperature?

Accepted Answer

The critical temperature is the temperature above which a gas cannot be condensed into a liquid, regardless of the pressure. The higher the intermolecular forces between the atoms or molecules of a substance, the higher its critical temperature. Among the given options, compound A, CH₃Cl, has the most complex molecular structure and therefore the strongest intermolecular forces, leading to the highest critical temperature.

Question 12

Which of the following atoms does not participate in hydrogen bonding?

Accepted Answer

Only oxygen (O), fluorine (F), and nitrogen (N) participate in hydrogen bonding due to their ability to form highly electronegative hydrogen bonds with hydrogen atoms. Sulfur (S) does not participate in hydrogen bonding as it has a larger atomic radius and lower electronegativity compared to oxygen, fluorine, and nitrogen.

Question 13

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

Accepted Answer

In a body-centered cubic (BCC) unit cell, there is one atom at each of the eight corners and one atom in the center. Each corner atom is shared among eight unit cells, contributing 1/8 of an atom per cell, totaling 1 atom from the corners. The atom in the center is not shared and contributes fully, adding 1 more atom. Therefore, the total number of atoms in a BCC unit cell is 2.

Question 14

Which one of the following substances should exhibit hydrogen bonding in the liquid state?

Accepted Answer

Substances that contain hydrogen bonded directly to an electronegative element such as oxygen, nitrogen or fluorine (abbreviated as N, O, and F) exhibit hydrogen bonding. Among the given choices, only E contains hydrogen bonded directly to nitrogen (NH) and oxygen (OH), making it capable of exhibiting hydrogen bonding in the liquid state.

Question 15

Which one of the following crystallizes in a metallic lattice?

Accepted Answer

Metallic lattice means a lattice of positively charged ions surrounded by a sea of delocalized electrons. Among the given options, only potassium (K) has the structure of a metallic lattice.

Question 16

Which of the responses includes all of the following that can form hydrogen bonds with water molecules? (1)Na⁺ (2)CH₃COOH (3)C₂H₆ (4)CH₃NH₂

Accepted Answer

CH₃COOH and CH₃NH₂ can form hydrogen bonds with water due to their polar functional groups (carboxyl and amine, respectively).

Question 17

Which one of the following substances crystallizes as a covalent crystal?

Accepted Answer

SiO2 is known as silicon dioxide or quartz, which is a covalent crystal.

Question 18

Which one of the following substances should exhibit hydrogen bonding in the liquid state?

Accepted Answer

Hydrogen bonding occurs when there is a hydrogen atom bonded to a highly electronegative atom such as oxygen, nitrogen or fluorine. In option E, there is a hydrogen atom bonded to an oxygen atom which makes it capable of forming hydrogen bonds in the liquid state. Option A has no atoms capable of forming hydrogen bonds, option B is a noble gas which cannot form hydrogen bonds, option C has sulfur atoms which are not as electronegative as oxygen or nitrogen and cannot form hydrogen bonds, and option D has carbon atoms which also cannot form hydrogen bonds.

Question 19

Which one of the following substances crystallizes as a molecular solid?

Accepted Answer

Molecular solids are substances composed of individual molecules held together by intermolecular forces. Of the given choices, only D, CH3OH, is a molecular substance. The others are either ionic or metallic compounds.

Question 20

Given the following liquids and their boiling points, which has the highest vapor pressure at its normal boiling point?

Accepted Answer

The answer of Given the following liquids and their boiling...

Quiz 11: Intermolecular Forces and Liquids and Solids

Arrange the following in order of increasing boiling point: RbCl, CH₃Cl, CH₃OH, CH₄.

Which property of water allows a razor blade to float on it without sinking?

Choose the response that lists the member of each of the following pairs that has the higher boiling point. (I) H₂O or KI (II) HF or HI (III) Cl₂ or Br₂

An example of a covalent network solid is

Which of the following is not true with regard to water?

Butter melts over a range of temperature, rather than with a sharp melting point. Butter is classified as a/an

Which one of the following is an example of a covalent network solid?

Krypton has a higher melting point than argon because of its

The structural form of the element Ge closely resembles the structure of

Each of the following substances is a gas at 25°C and 1 atmosphere pressure. Which one will liquefy most easily when compressed at a constant temperature?

Which of the following substances would have the highest critical temperature?

Which of the following atoms does not participate in hydrogen bonding?

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

Which one of the following substances should exhibit hydrogen bonding in the liquid state?

Which one of the following crystallizes in a metallic lattice?

Which of the responses includes all of the following that can form hydrogen bonds with water molecules? (1) Na⁺ (2) CH₃COOH (3) C₂H₆ (4) CH₃NH₂

Which one of the following substances crystallizes as a covalent crystal?

Which one of the following substances should exhibit hydrogen bonding in the liquid state?

Which one of the following substances crystallizes as a molecular solid?

Given the following liquids and their boiling points, which has the highest vapor pressure at its normal boiling point?

Quiz 11: Intermolecular Forces and Liquids and Solids

Arrange the following in order of increasing boiling point: RbCl, CH3Cl, CH3OH, CH4.

Which property of water allows a razor blade to float on it without sinking?

Choose the response that lists the member of each of the following pairs that has the higher boiling point. (I) H2O or KI (II) HF or HI (III) Cl2 or Br2

An example of a covalent network solid is

Which of the following is not true with regard to water?

Butter melts over a range of temperature, rather than with a sharp melting point. Butter is classified as a/an

Which one of the following is an example of a covalent network solid?

Krypton has a higher melting point than argon because of its

The structural form of the element Ge closely resembles the structure of

Each of the following substances is a gas at 25°C and 1 atmosphere pressure. Which one will liquefy most easily when compressed at a constant temperature?

Which of the following substances would have the highest critical temperature?

Which of the following atoms does not participate in hydrogen bonding?

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

Which one of the following substances should exhibit hydrogen bonding in the liquid state?

Which one of the following crystallizes in a metallic lattice?

Which of the responses includes all of the following that can form hydrogen bonds with water molecules? (1) Na+ (2) CH3COOH (3) C2H6 (4) CH3NH2

Which one of the following substances crystallizes as a covalent crystal?

Which one of the following substances should exhibit hydrogen bonding in the liquid state?

Which one of the following substances crystallizes as a molecular solid?

Given the following liquids and their boiling points, which has the highest vapor pressure at its normal boiling point?

Arrange the following in order of increasing boiling point: RbCl, CH₃Cl, CH₃OH, CH₄.

Choose the response that lists the member of each of the following pairs that has the higher boiling point. (I) H₂O or KI (II) HF or HI (III) Cl₂ or Br₂

Which of the responses includes all of the following that can form hydrogen bonds with water molecules? (1) Na⁺ (2) CH₃COOH (3) C₂H₆ (4) CH₃NH₂