Advertisement Upgrade to remove ads

chemical change

A change that occurs when two substances react to produce entirely different substances.

chemical equation (balanced)

An equation with an equal number of atoms in the reactants and products.

chemical formula

A representation of a compound that includes the symbols and numbers of atoms in the compound.

chemical reaction

The breaking of bonds to form new substances.

coefficient

The "6" in 6H2O

covalent bond

A bond between atoms in which electrons are shared.

product

The substance produced in a chemical reaction.

reactant

A substance that enters into and is changed during a chemical reaction.

subscript

The "2" in H2O

ion

An atom that has an electrical charge because it gained or lost an electron.

ionic bond

A bond between atoms in which electrons are lost or gained.

law of conservation of mass

You cannot create or lose mass in a reaction.

octet rule

Most atoms need eight valence electrons to be stable.

oxidation number

A number that indicates how many electrons will be gained or lost during bonding.

physical change

Ice melting is an example of this kind of change.

polyatomic ion

An ion like CO3 or OH

exothermic reaction

A chemical reaction in which energy is released.

endothermic reaction

A chemical reaction in which energy is required.

nuclear reaction

A reaction that involves splitting the nucleus of an atom or fusing 2 nuclei to make a new atom.

fusion

The process of combining the nuclei of atoms to make different atoms.

fission

Breaking up the nucleus of an atom.

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set