Question

what causes water molecules to stick together in liquid water?
A- attractive forces called hydrogen bonds.
B-expanding molecules in freezing temperatures.
C-magnetic forces in our solar system\
D-gaseous molecules called water vapor

Answer 1

Answer:

This sticking together of like substances is called cohesion. Depending on how attracted molecules of the same substance are to one another, the substance will be more or less cohesive. Hydrogen bonds cause water to be exceptionally attracted to each other. Therefore, water is very cohesive.

Answer 2

Answer:

The attractive forces called hydrogen bonds causes water molecules to stick together in liquid.

Therefore, the option (a) is correct.

Explanation:

• A hydrogen bonding is a kind of bonding which is present between hydrogen and a highly electronegative atom. Hydrogen bonds are weaker than the ionic bond or covalent bonds but they are stronger than Vander Waals force of attraction.
• There are two types of hydrogen bonds: Intramolecular hydrogen bond and intermolecular hydrogen bond. When the hydrogen bond formed within the single molecule is called intramolecular hydrogen bond. This type of hydrogen bonds present in ethylene glycol.
• When the hydrogen bond formed between two molecule is called intermolecular hydrogen bond. This type of  hydrogen bond present in water.
• A water molecule consists a highly electronegative oxygen atom linked with two hydrogen atoms. The electrons of the bond pair are attracted more by the oxygen atom in comparison of H-atom. as result, oxygen end of the molecule becomes negative, and the hydrogen atoms become positive.
• The attraction between the partially positive hydrogen of one water molecule and the negatively charged oxygen of another molecule leads to formation of hydrogen bonds. Therefore the molecules stick together in liquid water. One water molecule can formed maximum four hydrogen bonds with other water molecules.