SJI 9- SCIENCE: Ionic and Covalent Compounds (1)

What type of ion carries a net positive charge?

• Anion

• Cation

• Monoatomic ion

• Polyatomic ion

Which of the following ions contains only one type of atom?

• Na+

• NH₄⁺

• ClO₄⁻

• CN⁻

An atom that gains or loses electrons during bonding results in:

• A change in the number of protons

• A change in the number of neutrons

• A change in the number of electrons

• No change

What is the total number of protons in a sodium (Na+) ion?

• 10

• 11

• 12

• 13

Which type of bond holds ionic compounds together?

• Covalent bonds

• Ionic bonds

• Metallic bonds

• Hydrogen bonds

Which of the following is true for ionic compounds?

• They have low boiling points

• They are good conductors as liquids

• They are soft and flexible

• They are soluble in oil

What is the oxidation number of sodium (Na) in NaCl?

• +1

• -1

• 0

• +2

The oxidation number of oxygen (O) in most compounds is:

• -1

• -2

• +2

• +1

A covalent bond forms when atoms:

• Transfer protons

• Share electrons

• Gain neutrons

• Lose electrons

Which of the following is a molecular compound?

• CHCl₃

• MgCl₂

• NaCl

• K₂O