en chemistry khanacademy 5/5 (1)

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Videos on chemistry (roughly covering a first-year high school or college course).

Lessons

How elements relate to atoms. The basics of how protons, electrons and neutrons make up an atom. More free lessons at: http://www.khanacademy.org/video?v=IFKnq
478 views

The atom, proton, neutron and electron More free lessons at: http://www.khanacademy.org/video?v=1xSQl
462 views

An introduction to orbitals More free lessons at: http://www.khanacademy.org/video?v=yBrp8
537 views

More intuition on orbitals. Touching on electron configuration. More free lessons at: http://www.khanacademy.org/video?v=FmQoS
501 views

Introduction to using the periodic table to determine electron configurations
421 views

Figuring out configurations for the d-block elements More free lessons at: http://www.khanacademy.org/video?v=YURRe
478 views

Looking at valence electrons to figure out reactivity More free lessons at: http://www.khanacademy.org/video?v=1TZA1
473 views

Properties of alkali, alkaline earth and transition metals. Halogens and noble gases. More free lessons at: http://www.khanacademy.org/video?v=LDHg7
457 views

What an ion is. Using the periodic table to understand how difficult it is to ionize an atom. More free lessons at: http://www.khanacademy.org/video?v=ywqg9
497 views

Electronegativity, metallic nature and atomic radius.
449 views

Introduction to ionic, covalent, polar covalent and metallic bonds. More free lessons at: http://www.khanacademy.org/video?v=CGA8s
542 views

Introduction to molecular and empirical formulas. Calculating molecular mass. More free lessons at: http://www.khanacademy.org/video?v=gfBcM
501 views

Introduction to the idea of a mole as a number (vs. an animal) More free lessons at: http://www.khanacademy.org/video?v=AsqEk
555 views

Figuring out the empirical formula from a molecules mass composition
423 views

Another exercise converting a mass composition to an empirical formula. More free lessons at: http://www.khanacademy.org/video?v=sXOII
491 views

The art of balancing equations in chemistry! More free lessons at: http://www.khanacademy.org/video?v=RnGu3
520 views

Introduction to stoichiometry More free lessons at: http://www.khanacademy.org/video?v=SjQG3
498 views

Stoichiometry problem where we have a limiting reagent! More free lessons at: http://www.khanacademy.org/video?v=rESzy
474 views

Intuition behind the ideal gas equation: PV=nRT. More free lessons at: http://www.khanacademy.org/video?v=WScwP
498 views

Figuring out the number of moles of gas we have using the ideal gas equation: PV=nRT. More free lessons at: http://www.khanacademy.org/video?v=erjMi
487 views

PV/T is a constant. Figuring out the volume of an ideal gas at standard temperature and pressure (STP). More free lessons at: http://www.khanacademy.org/video?v=GwoX_
462 views

Figuring out the mass of Oxygen we have. More free lessons at: http://www.khanacademy.org/video?v=69V-6
520 views

Figuring out the molar mass of a mystery molecule at STP. More free lessons at: http://www.khanacademy.org/video?v=Osl6H
504 views

Figuring out the partial pressures of various gases in a container. More free lessons at: http://www.khanacademy.org/video?v=d4bqN
468 views

Introduction to the states or phases of matter. More free lessons at: http://www.khanacademy.org/video?v=pKvo0
498 views

More on Plasma and Hydrogen bonds. More free lessons at: http://www.khanacademy.org/video?v=Wenwt
527 views

Specifict heat and phase changes: Calculating how much heat is needed to convert 200g of ice at -10C to 110 degree steam. More free lessons at: http://www.khanacademy.org/video?v=zz4Kb
484 views

How much ice at -10 degrees C is necessary to get 500g of water down to 0 degrees C? More free lessons at: http://www.khanacademy.org/video?v=lsXcK
563 views

Understanding and interpreting phase diagrams More free lessons at: http://www.khanacademy.org/video?v=Qp87Z
598 views

Van Der Waals Forces: London Dispersion Forces, Dipole Attractions, and Hydrogen Bonds. More free lessons at: http://www.khanacademy.org/video?v=8qfzp
575 views

Covalent Networks, Metallic, and Ionic Crystals: Some of the strongest molecular structures. More free lessons at: http://www.khanacademy.org/video?v=Rw_pD
456 views

Vapor Pressure, Volatility, and Evaporation More free lessons at: http://www.khanacademy.org/video?v=hA5jd
539 views

Suspensions, Colloids and Solutions. The difference between Molarity and Molality. More free lessons at: http://www.khanacademy.org/video?v=3ROWX
516 views

Solubility of salt and gas solutes in liquid solvent. More free lessons at: http://www.khanacademy.org/video?v=zjIVJ
483 views

Raising or lowering the boiling or freezing point of a solution by adding solute. More free lessons at: http://www.khanacademy.org/video?v=z9Lxd
433 views

Kinetics, activation energy, activated complex and catalysts. More free lessons at: http://www.khanacademy.org/video?v=__zy-
468 views

Equilibrium reactions and constants. More free lessons at: http://www.khanacademy.org/video?v=CGJjj
533 views

Correcting a mistake and learning a bit about ion size More free lessons at: http://www.khanacademy.org/video?v=HBi8x
620 views

A probabilistic look at how molecules react to develop the intuition behind the equilibrium constant formula. More free lessons at: http://www.khanacademy.org/video?v=ONBJo
489 views

A more concrete attempt at showing how the probabilities of molecules reacting is related to their concentration. More free lessons at: http://www.khanacademy.org/video?v=psLX0
498 views

Ignoring the solution or the solid state molecules when calculating the equilibrium constant. More free lessons at: http://www.khanacademy.org/video?v=TsXlT
495 views

Le Chatelier's Principle regarding the "stressing" of reactions in equilibrium More free lessons at: http://www.khanacademy.org/video?v=4-fEv
491 views

Autoionization of water into hydronium and hydroxide ions. pH, pOH, and pKa. More free lessons at: http://www.khanacademy.org/video?v=2q4vS
517 views

Arrhenius, Bronsted Lowry, and Lewis Acids and Bases. More free lessons at: http://www.khanacademy.org/video?v=vShCn
458 views

Calculating the pH or pOH of strong acids and bases. More free lessons at: http://www.khanacademy.org/video?v=tS2YJ
452 views

Calculating the pH of a weak acid More free lessons at: http://www.khanacademy.org/video?v=dencu
455 views

pH of .2 M of NH3 (weak base). More free lessons at: http://www.khanacademy.org/video?v=gDJtO
488 views

Introduction to conjugate acids and bases More free lessons at: http://www.khanacademy.org/video?v=0LM6w
467 views

The pKa and pKb relationship between conjugate acids and bases (both of which are weak). More free lessons at: http://www.khanacademy.org/video?v=3Gm4n
425 views

Buffers and the Hendersen-Hasselbalch equation More free lessons at: http://www.khanacademy.org/video?v=LJmFb
455 views

Strong acid titration and equivalence point More free lessons at: http://www.khanacademy.org/video?v=299o6
479 views

Equivalence point when titrating a weak acid More free lessons at: http://www.khanacademy.org/video?v=gbpc_
500 views

Making sure you fully understand titration curves More free lessons at: http://www.khanacademy.org/video?v=BBIGR
456 views

Oxidation and reduction. Oxidation states.
443 views

More practice calculating oxidation states
441 views

Correcting an error in the last video regarding hydrogen peroxide.
476 views

Oxidation reduction (or redox) reactions
465 views

Redox reactions to drive Galvanic Cells.
453 views

Alpha, Beta, Gamma Decay and Positron Emission More free lessons at: http://www.khanacademy.org/video?v=3koOw
408 views

Introduction to half-life More free lessons at: http://www.khanacademy.org/video?v=9REPn
500 views

Showing that N(t)=Ne^(-kt) describes the amount of a radioactive substance we have at time T. For students with background in Calculus. Not necessary for intro chemistry class. More free lessons at ...
459 views

Introduction to Exponential Decay More free lessons at: http://www.khanacademy.org/video?v=HTDop
475 views

A few more examples of exponential decay. More free lessons at: http://www.khanacademy.org/video?v=Hqzak
452 views

The difference between macrostates and microstates. Thermodynamic equilibrium. More free lessons at: http://www.khanacademy.org/video?v=5EU-y
506 views

Using theoretically quasi-static and/or reversible processes to stay pretty much at equilibrium. More free lessons at: http://www.khanacademy.org/video?v=lKq-1
444 views

First law of thermodynamic and Internal Energy More free lessons at: http://www.khanacademy.org/video?v=Xb05C
641 views

Getting more intuition of internal energy, heat, and work More free lessons at: http://www.khanacademy.org/video?v=aOSlX
461 views

How a system can do work by expanding More free lessons at: http://www.khanacademy.org/video?v=obeGV
480 views

Why work from expansion is the area under the curve of a PV-diagram More free lessons at: http://www.khanacademy.org/video?v=M5uOI
468 views

Conceptual proof that the internal energy of an ideal gas system is 3/2 PV. More free lessons at: http://www.khanacademy.org/video?v=qSFY7
494 views

Isothermic and Adiabatic processes. Calculating the work done by an isothermic process. Seeing that it is the same as the heat added. More free lessons at: http://www.khanacademy.org/video?v=iiFWo ...
443 views

Introduction to the Carnot Cycle and Carnot Heat Engine More free lessons at: http://www.khanacademy.org/video?v=aAfBS
527 views

Proof of the volume ratios in a Carnot Cycle More free lessons at: http://www.khanacademy.org/video?v=ixRtS
459 views

Prroof that S (or entropy) is a valid state variable. More free lessons at: http://www.khanacademy.org/video?v=sPz5R
486 views

Clarifying that the thermodynamic definition of Entropy requires a reversible system. More free lessons at: http://www.khanacademy.org/video?v=PFcGi
555 views

Long video explaining why entropy is a measure of the number of states a system can take on (mathy, but mind-blowing). More free lessons at: http://www.khanacademy.org/video?v=WLKEV
474 views

A discussion of what entropy is and what it isn't. More free lessons at: http://www.khanacademy.org/video?v=xJf6p
520 views

Maxwell's Demon: A thought experiment that seems to defy the 2nd Law of Thermodynamics More free lessons at: http://www.khanacademy.org/video?v=aKRDv
452 views

More clarification as to what entropy is and what entropy is not. More free lessons at: http://www.khanacademy.org/video?v=dFFzA
658 views

Definition of efficiency for a heat engine. Efficiency of a Carnot Engine. More free lessons at: http://www.khanacademy.org/video?v=M_5KY
516 views

Seeing how we can scale and or reverse a Carnot Engine (to make a refrigerator) More free lessons at: http://www.khanacademy.org/video?v=pQWwP
507 views

Proving that a Carnot Engine is the most efficient engine More free lessons at: http://www.khanacademy.org/video?v=LUoUb
499 views

Understanding why enthalpy can be viewed as "heat content" in a constant pressure system. More free lessons at: http://www.khanacademy.org/video?v=fucyI
482 views

Standard heat of formation or standard enthalpy change of formation. More free lessons at: http://www.khanacademy.org/video?v=PK_JX
582 views

Using Hess's Law and standard heats of formation to determine the enthalpy change for reactions More free lessons at: http://www.khanacademy.org/video?v=chXMp
467 views

Intuition behind why spontaneity is driven by enthalpy, entropy and temperature. Introduction to Gibbs free energy. More free lessons at: http://www.khanacademy.org/video?v=ViAmQ
570 views

Determining if a reaction is spontaneous by calculating the change in Gibbs Free Energy. More free lessons at: http://www.khanacademy.org/video?v=sG1ZA
548 views

More formal understanding of why a negative change in Gibbs Free Energy implies a spontaneous, irreversible reaction. More free lessons at: http://www.khanacademy.org/video?v=7aur5
423 views

A look at why the "proof" of the relation between changes in Gibbs Free Energy and Spontaneity is wrong in many textbooks. More free lessons at: http://www.khanacademy.org/video?v=yYbzJ
474 views

Figuring grams of reactants and product produced from reaction of phosphorous and chlorine More free lessons at: http://www.khanacademy.org/video?v=jFv6k
530 views

Stoichiometry Example Problem 2 More free lessons at: http://www.khanacademy.org/video?v=eQf_E
438 views

Limiting Reactant Example Problem 1
386 views

Empirical and Molecular Formulas from Stoichiometry More free lessons at: http://www.khanacademy.org/video?v=FycJ8
408 views

Example of Finding Reactant Empirical Formula More free lessons at: http://www.khanacademy.org/video?v=66ziU
424 views

Stoichiometry of a Reaction in Solution More free lessons at: http://www.khanacademy.org/video?v=EKZSw
423 views

Another Stoichiometry Example in a Solution More free lessons at: http://www.khanacademy.org/video?v=_qrQK
414 views

Molecular and Empirical Forumlas from Percent Composition. Example 2.9 from Kotz Chemistry book More free lessons at: http://www.khanacademy.org/video?v=_H009
466 views

Using acid-base titration to find mass of oxalic acid More free lessons at: http://www.khanacademy.org/video?v=XjFNm
448 views

Spectrophotometry, Transmittance, Absorbance and the Beer-Lambert Law More free lessons at: http://www.khanacademy.org/video?v=qbCZb
414 views

Spectrophotometry Example - Determining concentration based on absorbance More free lessons at: http://www.khanacademy.org/video?v=VqAa_
398 views
 

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