Which of the following best describes how suspensions differ from solutions?

• A. Suspensions have solute particles that are completely dissolved, while solutions have undissolved particles.
• B. Suspensions are always transparent, whereas solutions are always opaque.
• C. Suspensions can only be formed with gases, while solutions can only be formed with liquids.
• D. Suspensions contain particles that are large enough to settle out over time, while solutions have particles that remain evenly distributed and do not settle.

Answer: (D)

Verified step by step guidance

1. Understand the definitions of solutions and suspensions: Solutions are homogeneous mixtures where the solute particles are completely dissolved at the molecular or ionic level, resulting in a uniform composition throughout.
2. Recognize that suspensions are heterogeneous mixtures where the particles are larger and not dissolved; these particles are visible under a microscope and can settle out over time due to gravity.
3. Note that in solutions, the particles are so small that they do not scatter light significantly and do not settle, making the mixture stable and uniform.
4. Identify that suspensions often appear cloudy or opaque because of the larger particle size, whereas solutions are typically clear or transparent.
5. Conclude that the key difference is the particle size and behavior over time: suspensions have large particles that settle out, while solutions have small particles that remain evenly distributed and do not settle.