What is a solution?

What is a solution?

• A. A mixture of two or more substances that separate over time
• B. A homogeneous mixture that looks like one substance
• C. A chemical reaction that produces a new substance
• D. A homogeneous mixture of two or more substances that appear to be one substance

Answer: (D)

A solution is a homogeneous mixture formed when a substance dissolves in another, making a single, uniform substance that looks the same throughout. The particles are spread so evenly that you can’t see the different parts, which is why it appears to be just one substance even though it’s made of two or more things. Salt in water or sugar in tea are classic examples of solutions. That’s why this option fits best: it describes a mixture of two or more substances that appear to be one substance. It also captures the idea that the mixture looks uniform, which is a key feature of solutions. The other ideas don’t fit as well: a mixture that separates over time isn’t a stable, uniform solution; a chemical reaction creates a new substance rather than simply dissolving one into another; and while a homogeneous mixture that looks like one substance is on the right track, emphasizing two or more substances makes it clear this is a solution, not a pure substance.

A solution is a homogeneous mixture formed when a substance dissolves in another, making a single, uniform substance that looks the same throughout. The particles are spread so evenly that you can’t see the different parts, which is why it appears to be just one substance even though it’s made of two or more things. Salt in water or sugar in tea are classic examples of solutions.

That’s why this option fits best: it describes a mixture of two or more substances that appear to be one substance. It also captures the idea that the mixture looks uniform, which is a key feature of solutions. The other ideas don’t fit as well: a mixture that separates over time isn’t a stable, uniform solution; a chemical reaction creates a new substance rather than simply dissolving one into another; and while a homogeneous mixture that looks like one substance is on the right track, emphasizing two or more substances makes it clear this is a solution, not a pure substance.