Which of the following is most clearly an example of a physical change? a. a solid dissolves when added to a liquid b. a solution color when something is added c. two liquids produce heat when mixed together d. a gas is released when two solutions are combined

Option (A) is the correct answer.

Explanation:

Physical change is defined as a change that does not bring any changes in the chemical properties of a substance.

For example, solubility, density, volume etc are all physical changes.

When sugar dissolves in water then it is a physical change.

Whereas color change may not necessarily shows a physical change because a chemical change can also lead to color change of a solution or substance.

For example, rusting of iron is a chemical reaction in which color change also occurs.

Hence, we can conclude that a solid dissolves when added to a liquid is most clearly an example of a physical change.

the molecules move in straight line until they collide with each other or with the walls of the container. collisions are perfectly elastic; when two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.

explanation: