## Chem. Lecture 7/21

 Solids have…
 Solids have definite shape and definite volume
 Liquids have….
 Liquids have definite volume but variable shape
 Gases have…
 Gases have indefinite shape and indefinite volume; always fills its container
 Solid → Liquid
 Solid → Liquid = MELTING
 Solid → Gas
 Solid → Gas = SUBLIMATION
 Gas → Solid
 Gas → Solid = Deposition
 Liquid → Gas
 Liquid → Gas = Boiling or Vaporization
 Gas → Liquid
 Gas → Liquid = Condensation
 Solid → Gas
 Solid → Gas = Sublimation
 Define extensive properties
 Extensive Properties – depend on how much there is (i.e mass, volume)
 Define Intensive Properties
 Intensive Properties – not dependent on amount   (ie. melting pt, solubility, color, etc.)
 Difference between Physical change and Chemical change
 Physical change – substance itself doesn’t change ; Chemical;change – substance changes into something else (only a single particle/atom needed to determine the chemical property)
 Homogeneous Mixtures have….
 Homogeneous Mixtures have uniform properties
 Atomic mass unit (amu) based on…
 Atomic mass unit (amu) based on the mass of C-12/12.
 Empirical Formula shows…
 Empirical Formula shows the ratio of the elements (‘simplified’)
 An unbalanced equation is also called a…
 An unbalanced equation is also called a S K E L E T O N Equation
 How is molar mass determined?
 Molar mass is the same as atomic mass found on the periodic table
 Mass ; Moles
 Mass ; Moles ; Divide total mass by molar mass to find the number of moles
 Particles ; Moles
 Let us write you a custom essay sample on Chem. Lecture 7/21 For Only \$13.90/page ORDER NOW Particles ; Moles ; Divide by 6.022 x 1023 (Avogadro’s #)
 Volume (Liters at STP) → Moles
 Volume (Liters at STP) → Moles   vol. in liters ÷ 22.4 liters/mol
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