Ionic Structures and Simple Covalent Molecules

Why is copper(II) chloride solid at room temperature?

Since there are ​ (a)   ​ (b)   forces of attraction between oppositely charged ions. And as ​ (c)   amounts of energy is required to ​ (d)   these forces. Therefore copper(II) chloride has a ​ (e)   melting point.

• strong
• electrostatic
• large
• overcome
• high
• weak
• intermolecular
• little
• break
• low

Why is carbon dioxide gas at room temperature?

Since there are ​ (a)   ​ (b)   forces of attraction between ​ (c)   . And as ​ little amounts of energy is required to ​ (d)   these forces. Therefore carbon dioxide has a ​ (e)   boiling point.

• weak
• intermolecular
• molecules
• overcome
• low
• strong
• electrostatic
• atoms
• break
• high

Select the properties that match a substance with ionic crystal lattice.

• high melting and boiling point

• low melting and boiling point

• conduct electricity in solid state

• conduct electricity in liquid state

• conduct electricity in aqueous state

Select the properties that match a substance with simple covalent molecular structure.

• high melting and boiling point

• low melting and boiling point

• conduct electricity in solid state

• conduct electricity in liquid state

• conduct electricity in aqueous state

Select the substance(s) that is/are ionic substances.

• sodium chloride

• iron

• water

• magnesium oxide

• hydrogen gas

Select the substance(s) that is/are simple covalent molecules

• sodium chloride

• iron

• water

• magnesium oxide

• hydrogen gas

Select the substance(s) that does not conduct in solid state but conducts in liquid state.

• sodium chloride

• iron

• water

• magnesium oxide

• hydrogen gas

Select the substance(s) that does not conduct electricity in any state.

• sodium chloride

• iron

• water

• magnesium oxide

• hydrogen gas

Which particles conduct electricity in ionic substances?

• proton

• molecule

• cation

• anion

• electron

Why sodium chloride doesn't conduct electricity in solid state?

Since sodium and chloride ​ (a)   are held in ​ (b)   positions, there are no mobile ​ (c)   to carry charge. Therefore sodium chloride cannot conduct electricity in solid state.

• ions
• fixed
• atoms
• molecules
• orderly
• disorderly