1. Ch.15 MATTER

3. PURE SUBSTANCES Pure substance blend together to make mixtures
Ex. elements/compounds/molecules
CHEMICALLY BONDED
Both have chemical formulas
C16H10N2O BLUE JEANS-INDIGO
3 C16H10N2O is the # of molecules (Coefficient)

4. Heterogeneous Mixtures
Particles in suspension are large, and settle out
Ex. )Pulpy orange juice
Particles in a colloid are smaller and do not settle out-Tyndall Effect-how light scatters from the particles
Ex.) Gelatin-tiny particles of proteins mixed w/ water (egg white, paint, blood)
Liquid-liquid mixtures carefully unmixed
Oil/ Water, Fat/Oil
Immiscible can mix in emulsions
Mayo-oil in vinegar, egg yolks keeps them together

5. Homogeneous Mixture Uniform, even under a microscope
Salt Water- all clear!
Solutions=homogeneous
Solution=solute +solvent
Solution: Salt Water
Solute=Salt
Solvent= Water (the universal solvent)
Miscible liquids form solutions
Distillation/Chromotography seperation

6. Kinetic Theory 1. All matter is made of atoms
2. The particles are always in motion- higher temp, the faster they move
3. At the same temp., larger particles move slower
Temperature=Average Kinetic Energy
0= Freeze =Boil

9. Chemical Properties Physical Properties Chemical Changes
Reactivity
Chemical Changes
Change in composition
Permanent
Physical Properties
Melting/boiling
Density D=m/v
Buoyancy
color/odor/shape
Physical Changes
Not chemical
Dissolving
Phase changes are physical