Chemistry Practice Set--Matter and Change

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition and appearance throughout. Examples include saltwater and air.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture that does not have a uniform composition and can have visibly different substances or phases. Examples include salad and granite.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting ice and dissolving sugar in water.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include burning wood and rusting iron.

Front

What happens to bread dough when yeast is added?

Back

The bread dough undergoes a chemical change as yeast ferments the sugars, producing carbon dioxide and causing the dough to rise.

Front

What is the classification of a raw egg?

Back

A raw egg is classified as a heterogeneous mixture because it contains different components (yolk, white) that are not uniformly distributed.

Front

What is the classification of ice?

Back

Ice is classified as a compound because it is made up of water molecules (H2O) that are chemically bonded.

Front

What is the classification of gasoline?

Back

Gasoline is classified as a homogeneous mixture because it has a uniform composition throughout.

Front

What is the classification of blood?

Back

Blood is classified as a heterogeneous mixture because it contains different components (red blood cells, plasma, white blood cells) that are not uniformly distributed.

Front

What is the difference between a physical and chemical change?

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.