A solution that contains many dissolved molecules in a fixed amount of solution is called

1. concentrated.

2. strong.

3. dilute.

4. weak.

A solution that contains many dissolved molecules in a fixed amount of solution is called concentrated (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 concentrated is a qualitative form to describe that a solution has a high concentration; this is, it contains many dissolved molecules in certain volume of solution).

The opposite to concentrated is diluted (choice 3). This is, a diluted solution contains a small amount of solute (molecules dissolved) in a fixed amount of solution.

The other two choices (2 and 4) use the terms strong and weak. 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.