Dissolving in Water

When a substance dissolves in water, it means that it breaks down into smaller particles and mixes evenly with water molecules. Some substances can dissolve in water while others cannot. Let's take a look at the options given in the question and see which one can dissolve in water.

Atoms

Atoms are the smallest unit of matter that cannot be broken down any further. They are the building blocks of all matter. However, atoms cannot dissolve in water as they are too small and do not have a charge.

Energy

Energy is not a substance but a property of matter. It cannot dissolve in water as it is not a physical object.

Molecules

Molecules are made up of two or more atoms that are chemically bonded together. Some molecules can dissolve in water while others cannot. The ability of a molecule to dissolve in water depends on its polarity. Polar molecules have a positive and negative end and can dissolve in water, while non-polar molecules cannot. Examples of polar molecules that can dissolve in water include sugar and salt.

Elements

Elements are substances made up of only one type of atom. Like atoms, they cannot dissolve in water as they are too small and do not have a charge.

Conclusion

Out of the given options, only molecules can dissolve in water. However, it is important to note that not all molecules can dissolve in water. The ability of a molecule to dissolve in water depends on its polarity.