Chemistry 1A - General Chemistry (2010)

Video Lectures

Displaying all 40 video lectures.
Lecture 1
Introduction to Chemistry
Play Video		 Introduction to Chemistry
Lecture 2
Eight is Enough: Periodic Table
Play Video		 Eight is Enough: Periodic Table
Lecture 3
Electron Glue: Chemical Bonds
Play Video		 Electron Glue: Chemical Bonds
Lecture 4
Shape Matters: Molecular Shape
Play Video		 Shape Matters: Molecular Shape
Lecture 5
Molecules in Motion
Play Video		 Molecules in Motion
Lecture 6
It's Just a Phase: Phase Changes
Play Video		 It's Just a Phase: Phase Changes
Lecture 7
Attractive Molecules: Liquids
Play Video		 Attractive Molecules: Liquids
Lecture 8
Big Molecules: Solids
Play Video		 Big Molecules: Solids
Lecture 9
Chemical Reactions
Play Video		 Chemical Reactions
Lecture 10
Make it Count: Mass, Mole, Molarity, pH
Play Video		 Make it Count: Mass, Mole, Molarity, pH
Lecture 11
Leftovers: Reaction Stoichiometry
Play Video		 Leftovers: Reaction Stoichiometry
Lecture 12
Back it up: Reversibility
Play Video		 Back it up: Reversibility
Key Idea:
Most reactions are reversible - simultaneously proceeding in both directions. At equilibrium, the rates in both directions are the same
Lecture 13
Basically Weak: Equilibrium Constant
Play Video		 Basically Weak: Equilibrium Constant
Key Idea:
The extent of dissociation of weak acids is expressed by their equilibrium constants
Lecture 14
Acid-Base
Play Video		 Acid-Base
Lecture 15
Neutral Territory: Acid-Base Reactions
Play Video		 Neutral Territory: Acid-Base Reactions
Key Idea:
Acids react with bases to form products that are "neutral"
Lecture 16
How Resilient: Buffers
Play Video		 How Resilient: Buffers
Key Idea:
Buffers resist changes in pH upon addition of strong acids or bases
Lecture 17
Like it or Not: Solubility Equilibria
Play Video		 Like it or Not: Solubility Equilibria
Key Idea:
Solubility Equilibrium constant is a measure of the maximum amount of a solute that dissolves in a solvent
Lecture 18
Finding Solutions: Solubility Product
Play Video		 Finding Solutions: Solubility Product
Key Idea:
Solubility product equilibrium constants can be used to predict solubility of ionic compunds

"If you are not part of the solution... You are part of the precipitate."
Lecture 19
Separation Anxiety: Separating Mixtures
Play Video		 Separation Anxiety: Separating Mixtures
Key Idea:
Equilibrium considerations can be used to design methods for separating components of mixtures.
Lecture 20
Review for the Midterm 2
Play Video		 Review for the Midterm 2
Key Ideas:
Changes in matter involve the reorganization of atoms, ions, and molecules depending on external conditions
Lecture 21
Point of View: Exchange of Energy
Play Video		 Point of View: Exchange of Energy
Key Idea:
Chemical change is associated with exchange of ENERGY
Lecture 22
The Heats is On: Thermal Equilibrium
Play Video		 The Heats is On: Thermal Equilibrium
Key Idea:
Hot objects transfer heat to colder objects until both are at the same temperature
Lecture 23
Make it or Break it: Bond Energies
Play Video		 Make it or Break it: Bond Energies
Key Idea:
Energy is required to break bonds, and is released when bonds are formed
Lecture 24
Compound Interest: Heats of Reactions
Play Video		 Compound Interest: Heats of Reactions
Key Idea:
Heats of reaction can be measured by calorimetry, or calculated using tabulated values of heats of formation
Lecture 25
What a Mess: Energy Dispersal
Play Video		 What a Mess: Energy Dispersal
Key Idea:

There is a natural tendency for energy to disperse
Lecture 26
Which Way? Enthalpy vs. Entropy
Play Video		 Which Way? Enthalpy vs. Entropy
Key Idea:
Reactions that are exothermic and increase entropy favor products. Other reactions that are either exothermic or increase entropy may also favor products.
Lecture 27
How Far? Gibbs Free Energy
Play Video		 How Far? Gibbs Free Energy
Key Idea:
Position of the equilibrium of a reaction depends on the magnitude and sign of the reaction enthalpy and entropy
Lecture 28
Make it Work: Heat and Work
Play Video		 Make it Work: Heat and Work
Key Idea:
Chemical energy can be converted into work and used to move objects
Lecture 29
Got Electrons? Redox Reactions
Play Video		 Got Electrons? Redox Reactions
Key Idea:
The direction of electron transfer in redox reactions can be determined from electron energies, expressed as electrode potentials
Lecture 30
Energy Bunny: Batteries
Play Video		 Energy Bunny: Batteries
Key Idea:
Electrochemical cells are used as portable power sources
Lecture 31
Feel the Power: Energy Sources
Play Video		 Feel the Power: Energy Sources
Key Idea:
The power we use in our daily lives comes at a cost
Lecture 32
Review for Midterm 3
Play Video		 Review for Midterm 3
Lecture 33
All Aglow: Light Energy
Play Video		 All Aglow: Light Energy
Key Idea:
Energy associated with movement of electrons can be converted into light
Lecture 34
How Absorbing: Light and Color
Play Video		 How Absorbing: Light and Color
Key Idea:
Colors of compounds are a result of absorption of a portion of the visible spectrum of light
Lecture 35
Now you See: Spectroscopy
Play Video		 Now you See: Spectroscopy
Key Idea:
Spectroscopy is a powerful tool for learning about atoms and molecules
Lecture 36
Photo Opportunity: The Subshell Model
Play Video		 Photo Opportunity: The Subshell Model
Key Idea:
High energy photons can be used to eject electrons from atoms
Lecture 37
Breaking the Code: Electron Configurations
Play Video		 Breaking the Code: Electron Configurations
Key Idea:
Orbitals of different shapes show the probability of finding electrons in atoms
Lecture 38
Technicolor Atoms: Line Spectra
Play Video		 Technicolor Atoms: Line Spectra
Key Idea:
When electrons relocate from one orbital to another, they absorb or emit a specific amount of energy
Lecture 39
Housing Co-op: Molecular Orbitals
Play Video		 Housing Co-op: Molecular Orbitals
Key Idea:
Colors of molecules reflect transitions of electrons between molecular orbitals when light is absorbed
Lecture 40
Dying to Know: Colorful Molecules
Play Video		 Dying to Know: Colorful Molecules
Key Idea:
Molecules with pi bonds and transition metal ions are colorful because the difference in energy between their molecular orbitals allows absorption of visible light