Matter, Molecules, and Atoms

Atoms, Molecules, and Matter make up many if not all of the things in our world. Lets learn, together, what makes them very important to our world.

Density Formulas

Density formula – M/V

Mass formula – D x V

Volume Formula – M/D


Chemical Change: A change in matter that produces one or more new substances.

Physical Change: a change which alters the form or appearance of matter but does not make any new substance in the matter.

Physical Change

Ripping Paper

Paper turns into pieces. A physical change has occurred and the substance has not changed.

Chemical Change

Burning Paper

Paper turns into ash. A chemical reaction has occurred and the substance has changed to ash.

States of Change

Solid –

Has a fixed shape

Has a fixed volume

Particles have very little energy and movement speed

Particles arranged in tight regular pattern

Liquid –

Has no fixed shape

Has a fixed volume

Particles have more space

Particles are fairly close, but not neat, even arrangement

Gas –

Has no fixed shape

Has no fixed volume

Particles move rapidly

Particles have large spaces in between them

Change of States

Endothermic change –

Takes in Energy

Exothermic change –

Releases Energy

Vaporization –

Liquid to gas

Ex – Water Cycle

Condensation –

Goes from gas(vapor) to a liquid

Ex – Rain and Clouds

Sublimation –

From Solid to Gas

Ex – Dry Ice

Law of Conservation of Mass

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.


Matter –

Matter is anything that has mass and takes up space.

Structure –

The arrangement of relations between the parts or elements of something with a complex basis.