Term Definition
Atom smallest unit of matter
Matter anything that has mass or volume
Examples of matter Humans, smoke,textbook , water,ladybug ..etc
Examples of non-matter Energy
light & sound
Mass How much matter is in something
Weight The pull of gravity on an object
Element Contains only one type of atom
Molecule Two or more atoms that are chemically combined
Formula for volume : length* width* height
Formula for density : mass/volume
Earth – Moon mass and weight Mass stays the same . Weight decreases on the moon because there is less gravity.
How can you separate compounds? By breaking the bonds between two or more atoms
Do atoms and molecules move? Yes,all atoms and molecules move.
They vibrate in a solid.
They slide in a liquid.
They move freely in gas
What does it mean if a substance is pure? It only has one type of component .


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