Chemistry Final Exam Review

Front

What is the mass number of an isotope?

Back

The mass number is the total number of protons and neutrons in an atom's nucleus.

Front

How do you determine the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which also equals the number of electrons in a neutral atom.

Front

What is a Lewis electron-dot structure?

Back

A Lewis electron-dot structure is a diagram that shows the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule.

Front

What is the boiling point of water?

Back

The boiling point of water is 100°C at standard atmospheric pressure.

Front

How many valence electrons does an element have?

Back

Valence electrons are the electrons in the outermost shell of an atom, which determine its chemical properties.

Front

What is a mixture?

Back

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

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What is the significance of valence electrons in chemical bonding?

Back

Valence electrons are important because they are involved in forming bonds between atoms, determining how an element will react chemically.

Front

What is an isotope?

Back

An isotope is a variant of a chemical element that has the same number of protons but a different number of neutrons.

Front

How do you calculate the mass number of an atom?

Back

The mass number is calculated by adding the number of protons and neutrons in the nucleus.