Martha places liquid substances in two separate containers. When she mixes these substances in the same container, a solid forms and settles at the bottom of the container.

Question

Why does a solid form when the two liquids mix together?

Responses

The two liquids react chemically and form a substance that is not soluble in water.
The two liquids react chemically and form a substance that is not soluble in water.

The two liquids react chemically and form a substance that is soluble in water.
The two liquids react chemically and form a substance that is soluble in water.

The two liquids react chemically and form a substance that decreases the temperature of the container.
The two liquids react chemically and form a substance that decreases the temperature of the container.

The two liquids react chemically and form a substance that increases the temperature of the container.
The two liquids react chemically and form a substance that increases the temperature of the container.

Answer 1

The appropriate response is:

The two liquids react chemically and form a substance that is not soluble in water.

When two liquids are mixed and a solid (precipitate) forms, it is often due to a chemical reaction that produces an insoluble substance. This solid then settles at the bottom of the container.