Question

what is a solution?
a mixture in which the molecules of one substance are evenly distributed within another substance
a mixture with only one type of substance evenly distributed in a space
any mixture of substances
a mixture in which the molecules of one substance are not evenly distributed within another substance

Explanation:

A solution is a homogeneous mixture. In a homogeneous mixture, the molecules of the solute (the substance being dissolved) are evenly distributed within the solvent (the substance doing the dissolving). For example, when salt (solute) is dissolved in water (solvent), the salt molecules spread out evenly throughout the water.

• The second option is incorrect because a mixture with only one - type of substance is not a mixture (it's a pure substance).
• The third option is too broad. Not all mixtures are solutions. For example, a mixture of sand and water is a heterogeneous mixture (not a solution) as the sand particles are not evenly distributed.
• The fourth option describes a heterogeneous mixture, not a solution.

Answer:

A. A mixture in which the molecules of one substance are evenly distributed within another substance