1. CHEMICAL INTERACTIONS INVESTIGATION 3: PARTICLES

2. KEY CONCEPTS MATTER IS MADE OF PARTICLES (atoms)
EVERY SUBSTANCE IS DEFINED BY A UNIQUE PARTICLE
GAS IS MATTER- IT HAS MASS AND OCCUPIES SPACE (air is matter made of particles)
“air” is made up of particles

3. KEY CONCEPTS
GASES ARE COMPOSED OF WIDELY SPACED INDIVIDUAL PARTICLES IN CONSTANT MOTION
THERE IS NOTHING BETWEEN GAS PARTICLES EXCEPT SPACE (the particles in air don’t touch each other).

4. KEY CONCEPTS
GAS COMPRESSES WHEN FORCE IS APPLIED; GAS EXPANDS WHEN FORCE IS WITHDRAWN (air that is forced into a smaller space is compressed air)
DURING COMPRESSION AND EXPANSION, THE NUMBER AND CHARACTER OF PARTICLES IN A SAMPLE OF GAS DO NOT CHANGE, THE SPACE BETWEEN THE PARTICLES DOES CHANGE.

5. KEY CONCEPTS
WHEN THE FORCE HOLDING AIR IN A SMALLER SPACE IS REMOVED, THE AIR EXPANDS- TAKES UP MORE SPACE.