Final answer:
Among the provided options, A. Salad is a mixture as it consists of different ingredients that are not chemically bonded and can be physically separated.
Step-by-step explanation:
The question is asking which choice among the given options is a mixture. A mixture is a physical combination of two or more substances where each substance retains its chemical properties and can be separated by physical means. Among the options provided:
- Salad is a mixture as it is made up of different ingredients, such as lettuce, tomatoes, cucumbers, etc., that are not chemically combined and can be physically separated.
- Sugar, or sucrose, is not a mixture but a compound, which means it is a substance made from two or more elements that are chemically combined.
- Water, in its pure form, is a compound, H2O, and therefore not a mixture.
- Potassium is an element, and elements are pure substances that are not made from a mixture of other substances.
Therefore, the choice that is a mixture is A. Salad.