Hess's law example | Thermodynamics | Chemistry | Khan Academy 
Hess's law example | Thermodynamics | Chemistry | Khan Academy by Khan
Video Lecture 107 of 124
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Date Added: August 14, 2016

Lecture Description

Hess's law example. Created by Sal Khan.

Watch the next lesson: www.khanacademy.org/science/chemistry/thermodynamics-chemistry/enthalpy-chemistry-sal/v/bond-enthalpy-and-enthalpy-of-reaction?utm_source=YT&utm_medium=Desc&utm_campaign=chemistry

Missed the previous lesson? www.khanacademy.org/science/chemistry/thermodynamics-chemistry/enthalpy-chemistry-sal/v/hess-s-law-and-reaction-enthalpy-change?utm_source=YT&utm_medium=Desc&utm_campaign=chemistry

Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a first-year high school or college course, and a good understanding of algebra is helpful.

Course Index

  1. Introduction to chemistry
  2. Elements and atoms | Atoms, compounds, and ions | Chemistry | Khan Academy
  3. Introduction to the atom | Chemistry of life | Biology | Khan Academy
  4. Orbitals | Electronic structure of atoms | Chemistry | Khan Academy
  5. More on orbitals and electron configuration | Chemistry | Khan Academy
  6. Electron Configurations
  7. Electron configurations 2 | Electronic structure of atoms | Chemistry | Khan Academy
  8. Noble gas configuration (old, low volume)
  9. Noble gas configuration | Electronic structure of atoms | Chemistry | Khan Academy
  10. Valence Electrons
  11. Groups of the Periodic Table
  12. Periodic Table Trends: Ionization Energy
  13. Other Periodic Table Trends
  14. Ionic, covalent, and metallic bonds | Chemical bonds | Chemistry | Khan Academy
  15. Molecular and Empirical Formulas
  16. The mole and Avogadro's number | Atoms, compounds, and ions | Chemistry | Khan Academy
  17. Formula from Mass Composition
  18. Another mass composition problem | Chemistry | Khan Academy
  19. Balancing Chemical Equations
  20. Stoichiometry | Chemical reactions and stoichiometry | Chemistry | Khan Academy
  21. Stoichiometry: Limiting reagent | Chemical reactions and stoichiometry | Chemistry | Khan Academy
  22. Ideal gas equation: PV = nRT | Chemistry | Khan Academy
  23. Ideal gas equation example 1 | Chemistry | Khan Academy
  24. Ideal gas equation example 2 | Chemistry | Khan Academy
  25. Ideal gas equation example 3 | Chemistry | Khan Academy
  26. Ideal gas equation example 4 | Chemistry | Khan Academy
  27. Introduction to partial pressure | Gases and kinetic molecular theory | Chemistry | Khan Academy
  28. Partial pressure example | Chemistry | Khan Academy
  29. States of matter | States of matter and intermolecular forces | Chemistry | Khan Academy
  30. States of matter follow-up | States of matter and intermolecular forces | Chemistry | Khan Academy
  31. Specific heat, heat of fusion and vaporization example | Chemistry | Khan Academy
  32. Chilling water problem | States of matter and intermolecular forces | Chemistry | Khan Academy
  33. Phase diagrams | States of matter and intermolecular forces | Chemistry | Khan Academy
  34. Van der Waals forces | States of matter and intermolecular forces | Chemistry | Khan Academy
  35. Covalent networks, metallic crystals, and ionic crystals | Chemistry | Khan Academy
  36. Vapor pressure | States of matter and intermolecular forces | Chemistry | Khan Academy
  37. Suspensions, colloids and solutions | Chemistry | Khan Academy
  38. Solubility and intermolecular forces | Chemistry | Khan Academy
  39. Boiling point elevation and freezing point depression | Chemistry | Khan Academy
  40. Introduction to kinetics | Energy and enzymes | Biology | Khan Academy
  41. Reactions in equilibrium | Chemical equilibrium | Chemistry | Khan Academy
  42. Group trend for ionization energy | Periodic table | Chemistry | Khan Academy
  43. Keq intuition | Chemical equilibrium | Chemistry | Khan Academy
  44. Keq derivation intuition | Chemical equilibrium | Chemistry | Khan Academy
  45. Heterogeneous equilibrium | Chemical equilibrium | Chemistry | Khan Academy
  46. Le Chatelier's principle | Chemical equilibrium | Chemistry | Khan Academy
  47. Introduction to pH, pOH, and pKw
  48. Acid Base Introduction
  49. pH, pOH of strong acids and bases | Chemistry | Khan Academy
  50. pH of a Weak Acid
  51. pH of a Weak Base
  52. Conjugate acids and bases
  53. pKa and pKb relationship | Acids and bases | Chemistry | Khan Academy
  54. Buffers and Henderson-Hasselbalch | Chemistry | Khan Academy
  55. Strong Acid Titration
  56. Buffer capacity | Buffers, titrations, and solubility equilibria | Chemistry | Khan Academy
  57. Weak Acid Titration
  58. Private video
  59. Titration roundup | Buffers, titrations, and solubility equilibria | Chemistry | Khan Academy
  60. Introduction to Oxidation States
  61. More on Oxidation States
  62. Hydrogen Peroxide Correction
  63. Redox Reactions
  64. Galvanic Cells
  65. Types of decay | Nuclear chemistry | Chemistry | Khan Academy
  66. Half-life and carbon dating | Nuclear chemistry | Chemistry | Khan Academy
  67. Exponential decay formula proof (can skip, involves calculus) | Chemistry | Khan Academy
  68. Introduction to exponential decay | Nuclear chemistry | Chemistry | Khan Academy
  69. More exponential decay examples | Nuclear chemistry | Chemistry | Khan Academy
  70. Macrostates and microstates | Thermodynamics | Physics | Khan Academy
  71. Quasistatic and reversible processes | Thermodynamics | Physics | Khan Academy
  72. First law of thermodynamics / internal energy | Thermodynamics | Physics | Khan Academy
  73. More on internal energy | Thermodynamics | Physics | Khan Academy
  74. Work from expansion | Thermodynamics | Physics | Khan Academy
  75. PV-diagrams and expansion work | Thermodynamics | Physics | Khan Academy
  76. Proof: U = (3/2)PV or U = (3/2)nRT | Thermodynamics | Physics | Khan Academy
  77. Work done by isothermic process | Thermodynamics | Physics | Khan Academy
  78. Carnot cycle and Carnot engine | Thermodynamics | Physics | Khan Academy
  79. Proof: Volume ratios in a carnot cycle | Thermodynamics | Physics | Khan Academy
  80. Proof: S (or entropy) is a valid state variable | Thermodynamics | Physics | Khan Academy
  81. Thermodynamic entropy definition clarification | Physics | Khan Academy
  82. Reconciling thermodynamic and state definitions of entropy | Physics | Khan Academy
  83. Entropy intuition | Thermodynamics | Physics | Khan Academy
  84. Maxwell's demon | Thermodynamics | Physics | Khan Academy
  85. More on entropy | Thermodynamics | Physics | Khan Academy
  86. Efficiency of a Carnot engine | Thermodynamics | Physics | Khan Academy
  87. Carnot efficiency 2: Reversing the cycle | Thermodynamics | Physics | Khan Academy
  88. Carnot efficiency 3: Proving that it is the most efficient | Physics | Khan Academy
  89. Enthalpy | Thermodynamics | Chemistry | Khan Academy
  90. Heat of formation | Thermodynamics | Chemistry | Khan Academy
  91. Hess's law and reaction enthalpy change | Chemistry | Khan Academy
  92. Gibbs free energy and spontaneity | Chemistry | Khan Academy
  93. Gibbs free energy example | Thermodynamics | Chemistry | Khan Academy
  94. More rigorous Gibbs free energy / spontaneity relationship | Chemistry | Khan Academy
  95. A look at a seductive but wrong Gibbs/spontaneity proof | Chemistry | Khan Academy
  96. Stoichiometry example problem 1 | Chemistry | Khan Academy
  97. Stoichiometry example problem 2 | Chemistry | Khan Academy
  98. Limiting reactant example problem 1 | Chemistry | Khan Academy
  99. Empirical and Molecular Formulas from Stoichiometry
  100. Example of Finding Reactant Empirical Formula
  101. Stoichiometry of a Reaction in Solution
  102. Another Stoichiometry Example in a Solution
  103. Molecular and Empirical Forumlas from Percent Composition
  104. Acid base titration example | Chemistry | Khan Academy
  105. Spectrophotometry introduction | Kinetics | Chemistry | Khan Academy
  106. Spectrophotometry example | Kinetics | Chemistry | Khan Academy
  107. Hess's law example | Thermodynamics | Chemistry | Khan Academy
  108. Vapor pressure example | Chemistry | Khan Academy
  109. Change of state example | States of matter and intermolecular forces | Chemistry | Khan Academy
  110. Small x approximation for small Kc | Chemistry | Khan Academy
  111. Small x approximation for large Kc | Chemical equilibrium | Chemistry | Khan Academy
  112. pH and pKa relationship for buffers | Chemistry | Khan Academy
  113. 2015 AP chemistry free response 5a
  114. AP Chemistry multiple choice sample: Boiling points
  115. Rate constant k from half-life example | Knetics | Chemistry | Khan Academy
  116. Ways to get a buffer solution | Chemistry | Khan Academy
  117. Comparing Q vs K example | Chemical equilibrium | Chemistry | Khan Academy
  118. Finding units of rate constant k | Knetics | Chemistry | Khan Academy
  119. Calculating internal energy and work example | Chemistry | Khan Academy
  120. Ionic bonds and Coulombs law
  121. Bond enthalpy and enthalpy of reaction | Chemistry | Khan Academy
  122. Introduction to reaction quotient Qc | Chemical equilibrium | Chemistry | Khan Academy
  123. Le Chatelier's principle: Worked example | Chemical equilibrium | Chemistry | Khan Academy
  124. Conjugate acid-base pairs | Acids and bases | Chemistry | Khan Academy

Course Description

An introductory college-level chemistry course that explores topics such as atoms, compounds, and ions; chemical reactions and stoichiometry; ideal gases; chemical equilibrium; acids and bases; kinetics; thermodynamics; redox reactions and electrochemistry; and a whole lot more!

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