Unit 3 Review Changes to Matter

Front

What is a solution?

Back

A solution is a mixture where one substance (the solute) is completely dissolved in another substance (the solvent). For example, sugar dissolved in water.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically combined. Each substance retains its own properties. An example is sand and pebbles.

Front

What happens when sugar is added to water?

Back

The sugar dissolves in the water, creating a solution where the sugar is no longer visible but still present.

Front

What is the difference between a compound and a mixture?

Back

A compound is a substance formed when two or more elements are chemically bonded together, while a mixture is a physical combination of substances that can be separated.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen, oxygen, and gold.

Front

What is the role of a solvent in a solution?

Back

The solvent is the substance that dissolves the solute. In a sugar-water solution, water is the solvent.

Front

What is the term for a solid that forms when two liquids react?

Back

The term is precipitate. It is a solid that separates from a solution during a chemical reaction.

Front

What is the process of a solid turning into a liquid called?

Back

The process is called melting.

Front

What is the process of a liquid turning into a gas called?

Back

The process is called evaporation.

Front

What is the term for a mixture where the different components can be easily seen and separated?

Back

The term is heterogeneous mixture.