1. matter, atoms, molecules Solid, liquid, gas

2.  What do we know about atoms?  How has our knowledge of the structure of atoms changed over time? (Democritus, Dalton, Thomson, Rutherford, Bohr, Current)

3.  Atoms are the smallest pieces of matter.  Atoms are too small to be seen.  Atoms contain protons, neutron & electrons.  Atom models have limitations. ◦ can’t be represented to scale ◦ can’t accurately show distance between particles ◦ can’t describe electron motion

4.  Label the protons, neutron & electrons.  What is realistic about your model?  What is unrealistic about your model?

5. AtomMolecule How are we alike and how are we different?

6.  Atoms combine to make molecules.  Molecules are two or more atoms that are bonded together.  A molecule has different properties than the atoms that it is made of.  The formula of a molecule tells what atoms make up the molecule. (CO2)

7.  Which state of matter matches the following pictures?

8.  Particles in all states of matter are in motion.  The greater the motion, the greater the volume.  This is the reason they build things to allow for expansion when they are heated and contraction when they are cooled.  The state of matter depends on the speed of the particles. o Gas – fastest particles (bump into each other) o Liquid – next fastest particles (slide past each other) o Solid – slowest particles (vibrate against each other)

9.  What is it?  How does the state of matter affect the diffusion rate?

10.  Particles diffuse from an area of higher concentration to an area of lower concentration.  The higher the temperature, the faster the rate of diffusion.  Diffusion happens the most rapidly in a gas.