Chemistry Midterm Review

Front

What makes isotopes of the same element chemically similar?

Back

They have the same number of protons.

Front

What is the SI base unit for length?

Back

Meter.

Front

Determine the number of neutrons in the isotope 31/15P.

Back

Neutrons = 31 - 15 = 16 neutrons.

Front

Why are scientific models considered 'workable' but not necessarily 'true'?

Back

Because they are simplifications that help explain observations and make predictions.

Front

A mixture that consists of two or more materials in distinct phases is called what?

Back

heterogeneous mixture.

Front

What is an isotope?

Back

Atoms of the same element with the same number of protons but different numbers of neutrons.

Front

Define a homogeneous mixture.

Back

A mixture that has a uniform composition throughout.

Front

What is the difference between a compound and a mixture?

Back

A compound is a substance formed when two or more elements chemically bond, while a mixture is a physical combination of substances.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

Explain the law of conservation of mass.

Back

Mass is neither created nor destroyed in a chemical reaction.