Advertisement Upgrade to remove ads


the smallest particle into which an element can be divided and still have the properties of that element; basic building block of matter


a substance made up of one kind of atom


matter made of two or more elements, has different properties from the elements it is made of


a quality or power belonging specially to something


the smallest particle of a substance that still has the properties of that substance


the material that all objects and substances are made of; anything thas has mass and takes up space


amount of matter in something; measured in grams


amount of space an object or substance takes up


using senses to gather information


drawing a conclusion using prior knowledge to make sense of our observations

liquid molecules

no definite shape, definite volume, not tightly packed, move about freely, slide over each other

gas molecules

no definite shape or volume, far apart, bounce off each other, move rapidly and randomly

solid molecules

definite shape and volume, attracted to each other, held tightly together, movement is limited, vibrate only

water molecule

an example of a compound

hydrogen and oxygen

examples of elements


Chemistry: center of an atom, made up of protons and neutrons


in an atom, particle with a neutral charge; located in the nucleus


positively charged particle located in the nucleus of an atom


negatively charged particle found outside 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


Reload the page to try again!


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