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Learn Chemistry Fast

(from someone who can actually explain it)

Chris is a Stanford-educated tutor with over 10 years experience tutoring Chemistry to students of all abilities, from students struggling to get from a C to a B, to go-getters trying to move an A- up to an A, to struggling students just hoping to pass. In that time he got a lot of experience learning how to explain this stuff in a way it actually makes sense to normal people. Through his videos he has helped countless students, and he can do the same for you.

Start Your Trial!Sample Chemistry Videos


  1. I. Units, Sig Figs & General Science Stuff

  2. Scientific Notation

    This chapter covers the basics of scientific notation, both converting it to regular numbers and back again. Decimals, huge numbers, multiplying scientific notation numbers together, positive exponents, negative exponents, "base 10", etc. it's all covered.

  3. Sig Figs & Rounding Decimals

    Sig figs. This chapter will teach them to you, but it's your job to remember to use them in every answer for the rest of the year or you'll lose half your points. Seriously.

  4. Unit Conversions & Dimensional Analysis

    The process of converting units, often called Dimensional Analysis, is one of the most important skills in science, and like sig figs you'll need it for the rest of the year.

  5. Density & Buoyancy

    This chapter covers the general concepts of density and buoyancy, as well as how to calculate density and flotation forces on submerged and floating objects.

  6. Temperature & Absolute Zero

    Converting between degrees Fahrenheit, Celsius, and Kelvin. Also covered: absolute zero, and why you always want to use Kelvin for gas problems.

  7. Standard Deviation & The Normal Distribution

    This chapter introduces standard deviation, tells you what the heck it is and how to calculate it, and relates it to the normal distribution.

  8. Percent Error

    Not a long chapter, but one which explains something that's probably on your next lab report.

  9. Moles
    Avogadro's Number

    Grams to moles, moles to grams, grams to number of atoms or molecules, conversions, 6.02 x 1023... Not quite stoichiometry yet, but you'll need this before you get there.

  10. II. Elements & Compounds

  11. Classifications of Matter

    These videos are an intro to chemistry. First we'll explain what the heck atoms, molecules and compounds are, then we'll explain how temperature makes a bunch of molecules decide to go from being a solid, to liquid, to gas.

  12. The Periodic Table

    This chapter shows you what everything on the periodic table means, including the families such as Alkalai Metals, Alkaline Earth Metals, Halogens, Transition Metals, and Noble Gases. It also explains how to tell which ions atoms form.

  13. Percent Abundance & Percent Composition

    These two topics don't have much in common except that students tend to confuse them, so that's why they're together.

  14. Types of Bonds

    An explanation of the two types of bonds which can hold atoms together: ionic and molecular (covalent).

  15. Naming Compounds

    Formulas and names of covalent compounds, names and balancing formulas of ionic compounds, names of acids, and common compounds you should know like Mother Eats Peanut Butter.

  16. Empirical Formulas

    How to find an empirical formula, how to derive a molecular formula from the empirical formula, and how to find molecular formula from percent composition.

  17. Lewis Dot Structures, Valence Electrons &
    Resonance Structures

    This chapter covers Lewis dot structures of atoms, ions, molecules, and polyatomic ions.

  18. Molecular Shape & VSEPR Theory

    In this chapter we use Valence Shell Electron Pair Repulsion, or "VSEPR", to figure out what shape molecules will have based on their Lewis Structures.

  19. Formal Charge

    This chapter covers how to find the formal charge on the atoms in a molecule. If this isn't on your syllabus, don't bother.

  20. Electronegativity & Polarity

    This chapter outlines electronegativity, and explains how to use it to determine if individual covalent bonds are polar or nonpolar, as well as whether whole molecules are polar.

  21. Intermolecular Forces
    Hydrogen Bonding
    London Forces
    Induced Dipole
    Metallic Bonds
    Network Covalent
    Ionic Structure
    Properties of Solids
    Liquid vs Gas

    This chapter covers everything about why particular elements and compounds form solids, liquids, or gases, from the forces that make them want to "stick together" to the kinetic heat/rattling which makes them want to break apart.

  22. III. Reactions

  23. Reaction Types You Should Know

    Just a bunch of vocab: combustion, redox, synthesis, oxidation, decomposition, exothermic, endothermic, rust, acid-base.

  24. Balancing Chemical Reactions

    Also covered: translating chemical names into balanced reactions.

  25. Moles
    Avogadro's Number

    Grams to moles, moles to grams, grams to number of atoms or molecules, conversions, 6.02 x 1023... Not quite stoichiometry yet, but you'll need this before you get there.

  26. Stoichiometry

    This chapter covers all these problems, from basic mole ratios and mole-mole types to the more advanced mass-mass (gram-gram).

  27. Limiting Reactant & Percent Yield

    Once you know stoichiometry, there's all kinds of exciting and complicated questions your teacher can ask you on tests and lab reports!

  28. IV. Gas

  29. Intro to Gases

    This chapter explains Kinetic Molecular Theory (KMT), defines pressure & density, and explains how molar volume and molar density at STP (22.4 liters) can make problems really short.

  30. Effusion & Diffusion

    This topic almost always comes in the form of questions about the rate of effusion and rate of diffusion.

  31. Gas Laws

    Ideal Gas Law, Combined Gas Law, Boyle's Law, Charles' Law, Gay-Lussac's Law, and how to tell them apart.

  32. Dalton's Law of Partial Pressures

    This chapter explains partial pressures, and works the most common types of problems.

  33. Gas Stoichiometry

    This chapter covers a molar volume shortcut you can use for stoichiometry when your reactants are all gases.

  34. V. Atoms

  35. History of Atoms

    The history of how scientists figured out that these things called "atoms" consist of a clump of protons with electrons orbiting: Rutherford's Gold Foil Experiment, "plum pudding" model, and Bohr.

  36. Isotopes & Mass Numbers

    This chapter explains isotopes, the most common problem types, and percent composition.

  37. Atomic Radius (Radii)

    This chapter shows you how to tell if one atom or ion is bigger than another using the periodic table.

  38. Electron Configurations & Orbital Diagrams

    Also covered are Hund's Rule, the Pauli Exclusion Principle, and shortcuts you can use to streamline electronic configurations.

  39. Quantum Numbers

    Sort of like the quantum version of x-y coordinates for electrons, these four coordinates give the shell, orbital type, sub-orbital and spin of every electron in an atom (Pauli Exclusion Principle).

  40. Photons & Light

    This chapter covers wavelength, frequency, electromagnetic spectrum (E&M), Planck's constant, energy of photons, and electron volts (eV, keV).

  41. Absorption & Emission Spectra

    This chapter explains how to calculate the energy, wavelength and frequency of photons which can be absorbed or emitted by electrons in hydrogen, using orbital energies or Rydberg's equation.

  42. Ionization Energy & Electron Affinity

    This chapter explains what ionization energy and electron affinity are, how to predict them based on the periodic table, and how to calculate them using Rydberg's equation.

  43. VI. Solutions

  44. Molarity, Molality, Concentration

    Also covered: parts per million (ppm), parts per billion (ppb), mass ratio (wt/wt), mole ratio (X), mass percent, and those dilution problems where you have to calculate the concentration of a solution after it's been combined with another.

  45. Electrolytes

    Strong vs Weak

    This chapter covers the definition of electrolytes, how they dissolve or dissociate in water, and what the heck "strong" and "weak" mean when dealing with acids and bases.

  46. Solubility Rules
    Net Ionic Equations

    This chapter explains how to use solubility charts to determine if ionic solids are soluble or insoluble, whether they precipitate, and how to write net ionic equations.

  47. Colligative Properties

    Freezing point depression, boiling point elevation. That's about it.

  48. Osmotic Pressure

    Osmotic pressure caused by semi-permeable membranes: what is it, why does it happen, and how to do osmosis calculations with ideal gas law.

  49. Calorimetry

    Heating & Cooling Curves

    Specific heat, bomb calorimeters, coffee cup calorimeters, heat of fusion, heat of vaporization, boiling, condensation... This chapter is packed!

  50. VII. Equilibrium

  51. Intro to Equilibrium
    Le Chatelier's Principle

    This chapter introduces equilibrium and explains how it applies to a couple common situations everyone is familiar with: dissolving sugar in water, and water evaporating to its vapor pressure in a closed container. The rest of the videos explain common questions involving Le Chatalier's Principle with respect to concentration, pressure and temperature.

  52. Equilibrium Constants & Quotients

    This chapter introduces equilibrium laws, then shows you how to plug in numbers, calculate equilibrium constants, and use quotients to figure out if a system is at equilibrium.

  53. Equilibrium Tables (ICE)
    Solubility Product (Ksp

    ICE tables (initial, change, equilibrium) allow us to use a bit of algebra to determine the concentrations at equilibrium when we aren't given the equilibrium constant. Solubility products allow us to calculate the solubility of compounds which would have been considered "insoluble" in the solubility rules chapter.

  54. Rate Laws
    Reaction Kinetics

    This chapter covers everything about reaction rates. An introductory video covers the factors you'll need to know for multiple choice and essay questions, then three more videos explain the three ways you'll need to be able to calculate reaction rate: graphs, stoichiometry, and rate laws.

  55. VIII. Acids & Bases

  56. Intro to Acids & Bases

    Naming Acids

    Arrhenius vs Bronsted-Lowry vs Lewis definitions of acids & bases. The hydronium ion. Conjugate acid-base pairs.

  57. pH Scale

    This chapter covers how to calculate pH and pOH from molarity, as well as how to calculate molarity from pH. Also covered is how to convert between pH and pOH, and why water auto-ionizes to pH 7.

  58. Weak Acids & Bases:
    Ka & Kb

    This chapter explains what is meant by a weak vs strong acid or base (it's not about concentration). It also explains how to use ICE tables to solve problems involving Ka and Kb.

  59. Neutralization & Titration

    Neutralization refers to a reaction where acid and base cancel each other out, usually by forming water. Titration refers to performing a neutralization experiment in the laboratory under controlled conditions, and calculating stuff based on the outcome.

  60. IV. Redox Reactions

  61. Intro to Redox & Oxidation Numbers

    This chapter covers what redox and oxidation numbers are, and it shows you how to calculate the oxidation numbers for each atom on a compound. Also covered are oxidation numbers of monoatomic and polyatomic ions.

  62. Reducing & Oxidizing Agents

    This video covers a very specific type of problem which most chemistry students find confusing: labeling the oxidizing and reducing agents.

  63. Balancing Redox Reactions

    This chapter covers one of the most complicated types of problems you'll find in your first year of chemistry: balancing reduction oxidation equations using the ion-electron method.

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