Chemical Reactions Review

Front

What is the definition of a stable atom?

Back

A stable atom has a full outer energy level of electrons, typically 8 electrons.

Front

How many valence electrons do atoms in group 15 have?

Back

Atoms in group 15 have 5 valence electrons.

Front

What is the mass number of an atom?

Back

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

Front

How many atoms of Carbon are in the formula C_{6}H_{12}O_{6}?

Back

There are 6 atoms of Carbon in the formula C_{6}H_{12}O_{6}.

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.

Front

What is a chemical change?

Back

A chemical change results in the formation of new substances with different properties.

Front

What are protons?

Back

Protons are positively charged particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutrons are neutral particles found in the nucleus of an atom.

Front

What are electrons?

Back

Electrons are negatively charged particles that orbit the nucleus of an atom.

Front

What is the octet rule?

Back

The octet rule states that atoms tend to gain, lose, or share electrons to have 8 electrons in their outer shell.