Chemistry 1st Semester Exam Key Terms

Front

Accuracy

Back

How close a measurement is to the true or accepted value.

Front

Atom

Back

The smallest unit of an element that retains the chemical properties of that element.

Front

Atomic Mass

Back

The average mass of an atom of an element, taking into account the different isotopes and their abundances.

Front

Boiling Point

Back

The temperature at which a liquid changes into a gas at a given pressure.

Front

Chemical Bond

Back

The attractive force that holds atoms together within a molecule.

Front

Covalent Bond

Back

A chemical bond formed by the sharing of electron pairs between atoms.

Front

Decomposition Reaction

Back

A chemical reaction in which a single compound breaks down into two or more simpler substances.

Front

Electron

Back

A negatively charged subatomic particle found outside the nucleus of an atom.

Front

Electronegativity

Back

A measure of an atom's ability to attract electrons in a chemical bond.

Front

Excited State

Back

A state in which an atom has absorbed energy and its electrons are at higher energy levels than in the ground state.