Chemistry The study of all matter and the changes it undergoes The study of EVERYTHING around us!

Matter Anything that has mass and takes up space. Anything that has a weight on Earth

The Atom The smallest unit of matter We can’t see individual atoms – they’re too small! Whatever we can see are large groups of atoms together!

States of Matter three different states: solid, liquid and gas How they differ in behavior: How far apart atoms are spaced How fast the atoms move Volume (how they take up space) Shape Compressible/expandable

Solid Tightly packed matter not much movement Holds its own shape Definite volume Not compressible Not much expansion when heated

Liquid Matter less closely packed than solid moves a little Takes shape of container Definite volume Not compressible Slight expansion upon heating

Gas Matter is spaced out moves quickly Takes shape of container Fills volume of container (not definite) Easily compressible Easily expandable

Examples: For the following examples: 1. Helium in a balloon Hold up 1 finger for a SOLID Hold up 2 fingers for a LIQUID Hold up 3 fingers for a GAS 1. Helium in a balloon 2. Gatorade 3. Motor Oil 4. Cupcake GAS! LIQUID! SOLID!

State of matter Particle diagram Atom spacing Atom movement Definite shape Definite volume Compressible expandable Solid Liquid Gas Loosely packed Far Apart Tightly packed Not much A little A lot yes no no yes yes no no no yes no no yes

Homework: State of Matter Poster Due: Friday 9-17-10 Task: On a blank, white sheet of paper… Pick one state of matter (solid, liquid, gas) List its properties (definite volume, particles, etc.) Draw its particle diagram (what the atoms look like) List at least 3 real-life examples Draw at least one of your real-life examples