According to this diagram showing the boiling of liquid water, what happens to liquid water when it boils?
A) The water turns into hydrogen and oxygen gas.
B) Covalent bonds in water are broken.
C) Hydrogen bonding forces are broken.
D) Covalent bonds in water are formed.
E) Hydrogen bonding forces are formed.

Question

According to this diagram showing the boiling of liquid water, what happens to liquid water when it boils? 
A) The water turns into hydrogen and oxygen gas. 
B) Covalent bonds in water are broken. 
C) Hydrogen bonding forces are broken. 
D) Covalent bonds in water are formed. 
E) Hydrogen bonding forces are formed.

Quizplus · Accepted Answer

When water boils, the intermolecular hydrogen bonding forces between water molecules are broken, causing the liquid water to vaporize and become water vapor (a gas). While the covalent bonds between the hydrogen and oxygen atoms within each individual water molecule are not broken, they are temporarily weakened by the increased kinetic energy of the water molecules during boiling. Therefore, answer choices A, B, D, and E are incorrect.

According to This Diagram Showing the Boiling of Liquid Water