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Chem. Lecture 7/21
phases & properties of matter, atomic mass unit, empirical formula, moles (conversion), mass percentage,
20
Chemistry
Undergraduate 1
07/24/2010

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Term

Solids have...
Definition
Solids have definite shape and definite volume
Term
Liquids have....
Definition
Liquids have definite volume but variable shape
Term
Gases have...
Definition
Gases have indefinite shape and indefinite volume; always fills its container
Term
Solid → Liquid
Definition
Solid → Liquid = MELTING
Term
Solid → Gas
Definition
Solid → Gas = SUBLIMATION
Term
Gas → Solid
Definition
Gas → Solid = Deposition
Term
Liquid → Gas
Definition
Liquid → Gas = Boiling or Vaporization
Term
Gas → Liquid
Definition
Gas → Liquid = Condensation
Term
Solid → Gas
Definition
Solid → Gas = Sublimation
Term
Define extensive properties
Definition

Extensive Properties - depend on how much there is

(i.e mass, volume)

Term
Define Intensive Properties
Definition

Intensive Properties - not dependent on amount

 

(ie. melting pt, solubility, color, etc.)

Term

Difference between

Physical change and Chemical change

Definition

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)

Term
Homogeneous Mixtures have....
Definition
Homogeneous Mixtures have uniform properties
Term
Atomic mass unit (amu) based on...
Definition
Atomic mass unit (amu) based on the mass of C-12/12.
Term
Empirical Formula shows...
Definition

Empirical Formula shows the ratio of the elements

('simplified')

Term
An unbalanced equation is also called a...
Definition
An unbalanced equation is also called a S K E L E T O N Equation
Term
How is molar mass determined?
Definition
Molar mass is the same as atomic mass found on the periodic table
Term
Mass → Moles
Definition

Mass → Moles

 

Divide total mass by molar mass to find the number of moles

Term
Particles → Moles
Definition

Particles → Moles

 

Divide by 6.022 x 1023 (Avogadro's #)

Term
Volume (Liters at STP) → Moles
Definition

Volume (Liters at STP) → Moles

 

vol. in liters ÷ 22.4 liters/mol

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