Chemical Bonding: Properties of Compounds

Which is a property of ionic compound?

• soft and flexible

• crystal lattice structure

• liquid or gaseous state at room temperature

• does not conduct electricity both in solid and melted form

Which is NOT a property of covalent compound?

• It has low melting point

• It exists in a stable crystalline structure.

• It does not exhibit any electrical conductivity.

• It is usually solid at normal temperature and pressure.

Which gives the best explanation of why a solid ionic compound DOES NOT conduct electricity?

• Solid ionic compounds do not have ions.

• Solid ionic compounds are not soluble in water.

• Solid ionic compounds have ions which are free to move.

• Solid ionic compounds have ions, but these ions are not free to move.

Which substance conducts electricity when dissolved in water?

• gasoline

• sugar

• paraffin wax

• monosodium glutamate

Why do ionic compounds tend to be less flammable than covalent compounds?

• Ionic compounds are poor conductor of heat.

• Ionic compounds do not have carbon and hydrogen atoms that react when heated with oxygen gas.

• Ionic compounds contain atoms that can react to form carbon dioxide and water when heated with oxygen gas.

• None of these

Why do ionic compounds conduct electricity when dissolved in water, but most covalent compounds do not?

• Covalent compounds have lower melting point than ionic compounds.

• Covalent compounds are weakly bonded while ionic compounds are strongly bonded.

• Covalent compounds do not dissolve in water since they are composed of non- polar molecules.

• Covalent compounds dissolve into molecules, while ionic compounds dissolve into ions that conduct charge.

When humans sweat, we lose ions necessary for bodily functions; to replenish them, we consume more ions, often in the form of an electrolyte solution. In a sports drink, which compound is NOT considered as electrolytes?

• glucose

• potassium

• sodium

• magnesium

The figure below represents the arrangement of particles in a substance. What kind of substance is this?

• Ionic compound

• Metallic compound

• Covalent compound

• None of these

Snowflake is an example of compound that begins to form when an extremely cold-water droplet freezes into a pollen or dust particle in the sky. Which is TRUE about a snowflake?

• Its chemical formula is the same as water.

• Its structure is the same as the crystalline lattice of an ionic compound.

• It is formed due to the transfer of electrons from two oxygen atoms to a hydrogen atom.

• It is formed when a raindrop freezes due to a very low temperature in the atmosphere.

Which of the following substances DO NOT exist in solid, liquid, or gas at room temperature and normal atmospheric pressure?

• I only

• II only

• III only

• III and IV only