Question 4

Hydrogen bonds hold water molecules together.

Water molecules are held together primarily by hydrogen bonds, which occur due to the polar nature of the water molecule. These bonds are formed when the positively charged hydrogen atoms of one water molecule are attracted to the negatively charged oxygen atom of another water molecule.

A) Ionic

Ionic bonds involve the transfer of electrons between atoms, resulting in the formation of charged ions that attract each other. While ionic bonds are strong, they do not play a role in holding water molecules together, making this option incorrect.

B) Covalent

Covalent bonds are formed when atoms share electrons, as seen within a single water molecule between hydrogen and oxygen. However, covalent bonds do not account for the interactions between separate water molecules, thus this option does not accurately describe how water molecules are held together.

C) Hydrogen

Hydrogen bonds are the primary force that holds water molecules together. These weak attractions between the hydrogen atoms of one water molecule and the oxygen atom of another result in the unique properties of water, including its high surface tension and boiling point, confirming this as the correct answer.

D) Molecular

Molecular bonds refer to the general interactions between molecules, which can include various types of bonding. However, this term does not specify the particular type of bond that holds water molecules together and is therefore too vague to be correct in this context.

Conclusion

Hydrogen bonds are essential in maintaining the structure and properties of water by connecting individual water molecules. The other options fail to accurately describe the specific interactions that occur in water, with only hydrogen bonds providing the necessary explanation for how water molecules are held together.