If a tablespoon of table salt is mixed with a tablespoon of water, the resulting solution can be classified as a __.
A) homogeneous mixture
B) pure substance
C) homogeneous pure substance
D) heterogeneous mixture
The correct answer and explanation is :
The correct answer is A) homogeneous mixture.
Explanation:
A mixture is a physical combination of two or more substances in which each substance retains its own chemical properties. Mixtures can either be homogeneous (uniform throughout) or heterogeneous (not uniform, with different parts visible). The classification of the mixture depends on how the components interact and distribute in the solution.
In this case, when a tablespoon of table salt (NaCl) is mixed with a tablespoon of water (H2O), a solution is formed. This process involves the dissolution of the salt into the water. The key point here is that the salt dissolves evenly in the water, and no distinct boundaries between the salt and water can be observed once the salt has dissolved. This means that the mixture is uniform throughout, with the salt molecules dispersed evenly in the water.
Because the salt is dissolved and evenly distributed, the solution is classified as a homogeneous mixture. In a homogeneous mixture, the composition is the same throughout the entire mixture. An example of a homogeneous mixture other than this solution would be air, where gases are evenly distributed.
On the other hand, a heterogeneous mixture would be one where the components remain physically separate or are not uniformly distributed (e.g., a mixture of sand and water, where you can clearly see the different components).
Furthermore, a pure substance refers to a material made up of only one type of molecule or atom, such as water (H2O) or salt (NaCl) in their pure forms. Since the combination of salt and water forms a mixture and not a single, pure substance, option B (pure substance) is incorrect. Additionally, option C (homogeneous pure substance) is also incorrect because the solution contains two substances (salt and water), not a single pure substance.
Therefore, the correct classification for the mixture of salt and water is a homogeneous mixture.