Question

a tossed salad is considered to be a ________.a heterogeneous mixtureb substancec homogeneous mixtured phase

Explanation:

• A substance has a fixed composition. A tossed salad has different components like vegetables, maybe nuts etc., so it's not a substance.
• A homogeneous mixture has a uniform composition throughout. In a tossed salad, we can see different parts (e.g., pieces of lettuce, tomato chunks) that are not uniformly distributed at a macroscopic level.
• A phase is a distinct form of matter (e.g., solid, liquid, gas phase). A tossed salad is a combination of different solids (vegetables) etc., but the term for its classification as a combination is not phase.
• A heterogeneous mixture has a non - uniform composition. In a tossed salad, we can visually distinguish the different components (like different types of vegetables), so it fits the definition of a heterogeneous mixture.

Answer:

A. heterogeneous mixture