Physical Science Ch 1-4 Semester exam

Front

What is a pure substance?

Back

A material that has a constant composition and consistent properties throughout. Examples include elements and compounds.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means. Examples include gold (Au) and oxygen (O2).

Front

What is a compound?

Back

A substance formed when two or more elements are chemically bonded together. Examples include water (H2O) and carbon dioxide (CO2).

Front

What is distilled water?

Back

Water that has been purified by boiling it and then condensing the steam back into a liquid, resulting in a pure substance.

Front

What is the charge of a neutron?

Back

Neutral; neutrons have no electric charge.

Front

What is the most important safety rule in a science lab?

Back

Always follow your teacher’s instructions and textbook directions exactly.

Front

Describe the arrangement of particles in a liquid.

Back

Particles are free to move around one another but still touch, allowing liquids to flow.

Front

What is viscosity?

Back

A measure of a fluid's resistance to flow. Higher viscosity means a thicker fluid.

Front

What is a homogeneous mixture?

Back

A mixture that has a uniform composition and appearance throughout, such as saltwater.

Front

What is a heterogeneous mixture?

Back

A mixture that consists of visibly different substances or phases, such as salad or sand and iron filings.