Unit 1 and 2 Review

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each substance retains its own properties.

Front

Which of the following is NOT a mixture: sand and iron filings, jar of sand and pebbles, salt in a saltshaker, pile of colored pencils?

Back

Salt in a saltshaker is NOT a mixture because it is a pure substance.

Front

What happens to the volume of water when it freezes?

Back

The volume of water increases when it freezes because water molecules move away from each other.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

How can you separate a mixture of gravel and sand?

Back

You can separate a mixture of gravel and sand by pouring it through a sieve.

Front

What is the best description of the materials in a pencil bag containing an eraser, two pencils, and a highlighter?

Back

The materials in the pencil bag are a mixture.

Front

If you mix sand with water, what happens to the total amount of sand and water?

Back

The total amount of sand and water stays the same because none of it is lost or gained.

Front

What is filtration?

Back

Filtration is a method used to separate solids from liquids or gases using a filter.

Front

What is an example of a homogeneous mixture?

Back

An example of a homogeneous mixture is saltwater, where the salt is evenly distributed.

Front

What is an example of a heterogeneous mixture?

Back

An example of a heterogeneous mixture is a salad, where the ingredients are not uniformly mixed.