Chapter 7

Physical Property

• Color

• Toxicity

Chemical Property

• Boiling Point

• Hardness

• Flammability

Signs of Chemical Change

• Odor

• Changes its identity

Why do we use a Chemical Formula ?

• To know what happens during a chemical reaction.

• To know the mass of an atom

Why do chemical changes create new substances ?

• They cool down and the particles slow down forming a solid.

• The particles move and collide together. The atoms then rearrange and bond with other atoms.

Higher Temperature

• Increases rate of reaction

• Slows down a reaction

Concentration

• Amount of a substance in a certain volume

• Amount of solubility

Density

• Mass per unit volume of a substance

• The ability of one substance to dissolve in another

Solubility

• Ability of one substance to dissolve in another.

• Amount of salt in a solution

Size-Dependent

• Dependent on size

• Not dependent on size