Answer:
- <em>A solution that contains many dissolved molecules in a fixed amount of solution is called</em> <u>concentrated</u> (first choice)
Explanation:
Concentration is the term used to express the amount of solute in a solution. The concentration is a measure of how much solute is dissolved.
The term <em>concentrated </em>is a qualitative form to describe that a solution has a high concentration; this is, it <em>contains many dissolved molecules</em> in certain volume of solution).
The opposite to concentrated is <em>diluted </em>(choice 3). This is, a diluted solution contains a <em>small amount of solute</em> (molecules dissolved) in a fixed amount of solution.
The other two choices (2 and 4) use the terms <em>strong</em> and <em>weak</em>. Those terms refere to a special kind of solutions, acids and bases, and designate how much they ionize (dissociate) in the solution: a strong acid or base dissociates in a high percent, while a weak acid or base dissociates poorly.