Chemical Bonds Assessment for 9th Grade

What is the primary function of chemical bonds?

• To create nuclear reactions

• To hold atoms together

• To break molecules apart

• To generate heat energy

According to the octet rule, how many valence electrons do most atoms aim to have?

• 2 electrons

• 4 electrons

• 6 electrons

• 8 electrons

Which type of bond forms between metals and nonmetals?

• Covalent bonds

• Hydrogen bonds

• Ionic bonds

• Van der Waals forces

What is a characteristic of ionic compounds?

• They only exist in liquid form

• They have low melting points

• They conduct electricity when dissolved

• They never form crystals

In a covalent bond, what happens between atoms?

• Electrons are transferred

• Electrons are shared

• Electrons are destroyed

• Electrons are created

Which of these is an example of an ionic compound?

• O₂

• NaCl

• N₂

• H₂O

How many pairs of electrons are shared in a double bond?

• One pair

• Two pairs

What characterizes a polar bond?

• Even sharing of electrons

• No sharing of electrons

• Uneven sharing of electrons

• Complete transfer of electrons

What determines molecular shapes?

• Temperature

• Pressure

• Electron arrangement

• Nuclear size

What is electronegativity?

• The ability to conduct electricity

• The electron-attracting power

• The number of protons

• The atomic mass