====== Questions et réponses en chimie sur chemistry.stackexchange ======
[[http://chemistry.stackexchange.com|Chemistry Stack Exchange]] est un site de questions et réponses pour les scientifiques, les enseignants, les étudiants,... Il est gratuit, est son contenu est sous licence libre (copyleft) [[https://creativecommons.org/licenses/by-sa/3.0/|Creative Commons BY-SA]]. Aucune inscription n'est requise pour la consultation. Vous devez vous identifier pour y contribuer. Le fonctionnement est réglé par un système de [[http://chemistry.stackexchange.com/help/whats-reputation|points de réputation]], donnant de plus en plus de droits.

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<note tip>Des questions sont simplement intéressantes pour leur aspect scientifique. Quelques unes émanent d'élèves ou étudiants en recherche d'explications qui peuvent apparaître éventuellement triviales. C'est alors la démarche, la formulation, et parfois les réponses de moindre qualité qui sont intéressantes, dans le cadre d'une formation en enseignement de la chimie.</note>

~~socialite~~

===== Sélection de questions intéressantes  =====
  * [[http://chemistry.stackexchange.com/questions/36970/how-to-balance-more-complex-redox-reactions|How to balance more complex redox reactions?]] → **[[exos_comment_equilibrer_des_redox_complexes|Comment équilibrer des réactions redox complexes]]**
  * [[http://chemistry.stackexchange.com/questions/37255/sp5-hybridization-in-cyclopropane|sp5 hybridization in cyclopropane]]
    * [[https://chemistry.stackexchange.com/questions/138297/is-hybridization-of-the-cyclopropyl-anion-sp5|Is hybridization of the cyclopropyl anion sp5?]]
  * [[https://chemistry.stackexchange.com/questions/104839/what-determines-the-coefficients-in-the-wavefunction-of-a-hybrid-orbital|What determines the coefficients in the wavefunction of a hybrid orbital?]]
  * [[https://chemistry.stackexchange.com/questions/4399/how-do-i-figure-out-the-hybridization-of-a-particular-atom-in-a-molecule|How do I figure out the hybridization of a particular atom in a molecule?]]
  * [[https://chemistry.stackexchange.com/questions/83566/hch-bond-angle-in-cyclopropane-and-cyclobutane|HCH bond angle in cyclopropane and cyclobutane]]
  * [[http://chemistry.stackexchange.com/questions/37794/when-can-a-molecule-be-considered-freely-rotating-at-room-temperature|When can a molecule be considered freely rotating at room temperature?]]
  * [[http://chemistry.stackexchange.com/questions/2879/what-is-the-definition-of-of-compound-mixture-element-and-molecule|What is the definition of of 'compound', 'mixture', 'element' and 'molecule'?]]
    * cf. [[http://pubs.acs.org/doi/abs/10.1021/ed200269e]]
    * [[http://pubs.acs.org/doi/abs/10.1021/ed3004275]]
  * [[http://chemistry.stackexchange.com/questions/7439/chemistry-behind-gales-coffee-maker-in-breaking-bad|Chemistry behind Gale's Coffee Maker in Breaking Bad]]
  * [[https://chemistry.stackexchange.com/questions/5915/why-do-salts-such-as-nacl-dissolve|Why do salts such as NaCl dissolve?]] → **[[exos_pourquoi_les_sels_tels_que_le_nacl_se_dissolvent_dans_l_eau|Pourquoi les sels tels que le NaCl se dissolvent dans l'eau ?]]**
  * [[http://chemistry.stackexchange.com/questions/38597/non-bonded-orbitals-in-water|Non bonded orbitals in water]]
  * [[http://chemistry.stackexchange.com/questions/4094/white-powder-observed-after-boiling-water-in-electric-kettle-for-many-weeks|White powder observed after boiling water in electric kettle for many weeks]]
  * [[http://chemistry.stackexchange.com/questions/39874/conflict-between-organic-and-physical-chemists-explaining-the-intensities-of-ir|Conflict Between Organic and Physical Chemists--explaining the intensities of IR absorptions]]
  * [[http://chemistry.stackexchange.com/questions/41189/estimation-of-the-bond-angle-of-water|Estimation of the bond angle of water]]
  * [[http://chemistry.stackexchange.com/questions/41862/what-is-the-real-difference-between-%E2%88%86g-and-%E2%88%86g|What is the real difference between ∆G and ∆G°?]]
  * [[http://chemistry.stackexchange.com/questions/41979/are-non-exothermic-explosions-possible|Are non-exothermic explosions possible?]]
  * [[http://chemistry.stackexchange.com/questions/41371/will-a-strong-acid-still-dissociate-completely-even-in-the-presence-of-a-stron|Will a strong acid still dissociate “completely” even in the presence of a stronger acid?]]
  * [[http://chemistry.stackexchange.com/questions/15852/during-a-phase-change-in-matter-why-doesnt-the-temperature-change|During a phase change in matter, why doesn't the temperature change?]]
  * [[http://chemistry.stackexchange.com/questions/5672/does-an-onion-completely-remove-fresh-paint-vocs-and-other-chemicals-emitted|Does an onion completely remove “fresh” paint VOCs and other chemicals emitted?]]
  * [[http://chemistry.stackexchange.com/questions/17089/why-doesnt-calcium-carbonate-dissolve-in-water-even-though-it-is-an-ionic-compo|Why doesn't calcium carbonate dissolve in water even though it is an ionic compound?]]
  * [[http://chemistry.stackexchange.com/questions/42075/why-is-the-minus-sign-not-allowed-in-chemistry|Why is the minus sign (-) not allowed in Chemistry?]]
  * [[http://chemistry.stackexchange.com/questions/42266/reason-behind-le-chateliers-principle|Reason behind Le Chatelier's principle]]
  * [[http://chemistry.stackexchange.com/questions/8598/maximum-number-of-electrons-each-shell|maximum number of electrons each shell]]
  * [[http://chemistry.stackexchange.com/questions/42913/when-is-there-hybridization-and-when-is-there-no-hybridization|When is there hybridization and when is there no hybridization?]]
  * [[http://chemistry.stackexchange.com/questions/5023/why-calcium-chloride-is-used-to-melt-ice-over-sodium-chloride|Why calcium chloride is used to melt ice over sodium chloride]]
  * [[https://chemistry.stackexchange.com/questions/16267/why-do-we-write-nh%E2%82%83|Why do we write NH₃?]]
  * [[http://chemistry.stackexchange.com/questions/15606/can-you-make-napalm-out-of-gasoline-and-orange-juice-concentrate|Can you make napalm out of gasoline and orange juice concentrate?]]
  * [[http://chemistry.stackexchange.com/questions/43167/why-is-borax-used-as-a-primary-standard|Why is Borax used as a primary standard?]] → **[[exos_pourquoi_le_borax_est_il_utilise_comme_standard_primaire|Pourquoi le borax est-il utilisé comme standard primaire]]**
  * [[http://chemistry.stackexchange.com/questions/44605/what-is-the-origin-of-the-positive-to-negative-convention-concerning-dipole-mo|What is the origin of the “positive-to-negative” convention concerning dipole moments in chemistry?]]
  * [[http://chemistry.stackexchange.com/questions/44414/is-there-a-chemical-reaction-that-speeds-up-when-the-temprature-gets-lower|Is there a chemical reaction that speeds up when the temprature gets lower?]]
  * [[http://chemistry.stackexchange.com/questions/44699/cucl2-has-colour-but-cucl-does-not|CuCl2 has colour but CuCl does not]]
  * [[http://chemistry.stackexchange.com/questions/9272/why-is-phenolphthalein-an-appropriate-indicator-for-titration-of-a-strong-acid-w|Why is phenolphthalein an appropriate indicator for titration of a strong acid with a strong base?]] → **[[exos_pourquoi_la_phenolphtaleine_est_un_indicateur_approprie_pour_le_titrage_d_un_acide_fort_par_une_base_forte|Pourquoi la phénolphtaléine est un indicateur approprié pour le titrage d'un acide fort par une base forte ?]]**
  * [[http://chemistry.stackexchange.com/questions/47049/why-does-caco3-react-with-hcl-but-not-with-h2so4|Why does CaCO3 react with HCl, but not with H2SO4?]]
  * [[http://chemistry.stackexchange.com/questions/47908/why-is-hcl-a-stronger-acid-than-acetic-acid|Why is HCl a stronger acid than Acetic Acid?]]
  * [[http://chemistry.stackexchange.com/questions/48196/why-is-adsorption-exothermic|Why is adsorption exothermic]]
  * [[http://chemistry.stackexchange.com/questions/949/iron-nomenclature-differences-between-ironiii-and-ferric/|Iron nomenclature differences between Iron(III) and Ferric]]
  * [[http://chemistry.stackexchange.com/questions/49752/why-do-the-atoms-in-molecular-models-have-the-colors-they-have|Why do the atoms in molecular models have the colors they have?]]
  * [[http://chemistry.stackexchange.com/questions/444/can-an-atom-have-more-than-8-valence-electrons-if-not-why-is-8-the-limit|Can an atom have more than 8 valence electrons? If not, why is 8 the limit ?]]
  * [[http://chemistry.stackexchange.com/questions/51099/is-there-a-difference-between-nacl-or-table-salt-processed-and-salt-from-the-h|Is there a difference between NaCl or table salt (processed) and salt from the Himalayas?]]
  * [[http://chemistry.stackexchange.com/questions/51140/weird-wikipedia-section-on-oxidizing-behavior-of-nitric-and-sulfuric-acids|Weird Wikipedia Section on Oxidizing Behavior of Nitric and Sulfuric Acids]]
  * [[http://chemistry.stackexchange.com/questions/15852/during-a-phase-change-in-matter-why-doesnt-the-temperature-change|During a phase change in matter, why doesn't the temperature change?]]
  * [[http://chemistry.stackexchange.com/questions/14373/how-to-calculate-melting-boiling-points-at-different-pressures|How to calculate melting/boiling points at different pressures]]
  * [[http://chemistry.stackexchange.com/questions/54062/why-does-entropy-increase-when-the-difference-in-temperatures-is-decreased|Why does entropy increase when the difference in temperatures is decreased?]]
  * [[https://chemistry.stackexchange.com/questions/16507/why-doesnt-copper-react-with-hydrochloric-acid-while-the-other-metals-do|Why doesn't copper react with hydrochloric acid while the other metals do?]]
  * [[http://chemistry.stackexchange.com/questions/15394/reaction-of-silver-nitrate-and-hydrochloric-acid|Reaction of silver nitrate and hydrochloric acid]]
  * [[http://chemistry.stackexchange.com/questions/57249/how-could-a-change-in-alkalinity-explain-rio-2016-pool-water-turning-green|How could a change in alkalinity explain Rio 2016 pool water turning green?]]
  * [[http://chemistry.stackexchange.com/questions/5737/is-a-negative-ph-level-physically-possible|Is a negative pH level physically possible?]]
  * [[http://chemistry.stackexchange.com/questions/58063/to-which-block-of-the-periodic-table-does-helium-belong|To which block of the periodic table does helium belong?]]
  * [[http://chemistry.stackexchange.com/questions/58171/why-does-the-ionization-energy-decrease-anytime-the-atom-size-increases|Why does the ionization energy decrease anytime the atom size increases?]] → **[[teaching:exos_pourquoi_l_energie_d_ionisation_diminue_t_elle_lorsque_la_taille_de_l_atome_augmente|Pourquoi l'énergie d'ionisation diminue-t-elle lorsque la taille de l'atome augmente ?]]**
  * [[http://chemistry.stackexchange.com/questions/58301/why-do-raisins-bob-up-and-down-in-carbonated-water|Why do raisins bob up and down in carbonated water?]]
  * [[http://chemistry.stackexchange.com/questions/58564/are-any-bonds-broken-when-no2-becomes-n2o4|Are any bonds broken when NO2 becomes N2O4?]]
  * [[http://chemistry.stackexchange.com/questions/58625/what-is-the-physical-basis-for-hunds-first-rule|What is the physical basis for Hund's first rule?]]
  * [[http://chemistry.stackexchange.com/questions/58617/entropy-change-when-indistinguishable-particles-suddenly-become-distinguishable|Entropy change when indistinguishable particles suddenly become distinguishable]]
  * [[http://chemistry.stackexchange.com/questions/16640/how-do-you-melt-metals-with-super-high-melting-points|How do you melt metals with super high melting points?]]
  * [[http://chemistry.stackexchange.com/questions/22364/what-is-heating-under-reflux|What is “heating under reflux”?]]
  * [[http://chemistry.stackexchange.com/questions/59285/how-could-i-cause-metal-to-rust-rapidly|How could I cause metal to rust rapidly?]]
  * [[http://chemistry.stackexchange.com/questions/59146/is-it-possible-for-halogens-to-show-oxidation-states-less-than-1|Is it possible for halogens to show oxidation states less than -1?]]
  * [[http://chemistry.stackexchange.com/questions/5748/why-does-ice-water-get-colder-when-salt-is-added|Why does ice water get colder when salt is added?]]
  * [[http://chemistry.stackexchange.com/questions/60055/pi-electron-stacking-how-does-it-work|Pi electron stacking, how does it work?]]
  * [[http://chemistry.stackexchange.com/questions/60716/what-exactly-is-a-mole|What exactly is a mole?]]
  * [[http://chemistry.stackexchange.com/questions/60502/how-are-the-atomic-orbitals-for-multi-electron-atoms-obtained|How are the atomic orbitals for multi electron atoms obtained?]]
  * [[http://chemistry.stackexchange.com/questions/60640/why-cant-alcohols-form-hydrogen-bonded-dimers-like-carboxylic-acids|Why can't alcohols form hydrogen-bonded dimers like carboxylic acids?]]
  * [[http://chemistry.stackexchange.com/questions/61040/what-are-oxidation-states-used-for|What are oxidation states used for?]]
  * [[http://chemistry.stackexchange.com/questions/16055/why-do-we-use-helium-in-balloons|Why do we use helium in balloons?]]
  * [[http://chemistry.stackexchange.com/questions/61406/why-would-breathing-pure-oxygen-be-a-bad-idea|Why would breathing pure oxygen be a bad idea?]]
  * [[http://chemistry.stackexchange.com/questions/62352/why-is-the-reduction-by-sugars-more-efficient-in-basic-solutions-than-in-acidic|Why is the reduction by sugars more efficient in basic solutions than in acidic ones?]]
  * [[http://chemistry.stackexchange.com/questions/62262/chemical-bonding-and-dipole-moment|Chemical bonding and dipole moment]]
  * [[http://chemistry.stackexchange.com/questions/2509/how-do-i-type-a-simple-chemical-equation-in-microsoft-word|How do I type a simple chemical equation in Microsoft Word?]]
  * [[http://chemistry.stackexchange.com/questions/62538/how-can-i-safely-handle-a-concentrated-fuming-nitric-acid-spill|How can I safely handle a concentrated (fuming) nitric acid spill?]]
  * [[http://chemistry.stackexchange.com/questions/62787/how-to-separate-alloys|How to separate alloys?]]
  * [[http://chemistry.stackexchange.com/questions/63782/how-does-osmosis-work|How does osmosis work?]]
  * [[http://chemistry.stackexchange.com/questions/6751/how-does-one-tell-if-a-specific-molecule-is-acidic-or-basic|How does one tell if a specific molecule is acidic or basic?]]
  * [[http://chemistry.stackexchange.com/questions/65297/why-is-ammonium-a-weak-acid-if-ammonia-is-a-weak-base|Why is ammonium a weak acid if ammonia is a weak base?]]
    * //cf.// [[http://chem.libretexts.org/Core/Organic_Chemistry/Fundamentals/What_is_the_pKa_of_water%3F|What is the pKa of water?]] (chemistry libretexts)
  * [[https://chemistry.stackexchange.com/questions/48373/ammonium-hydroxide-name|Ammonium Hydroxide Name]]
  * **pKa de l'ion hydronium ou oxonium...**
    * [[https://chemistry.stackexchange.com/questions/47458/how-to-calculate-ka-for-hydronium-and-kb-for-hydroxide|How to calculate Ka for hydronium and Kb for hydroxide?]]
    * [[https://chemistry.stackexchange.com/questions/9847/what-is-the-pka-of-the-hydronium-or-oxonium-ion-h3o|What is the pKa of the hydronium, or oxonium, ion (H3O+)?]]
  * [[http://chemistry.stackexchange.com/questions/65217/why-are-snowflakes-shaped-as-they-are|Why are snowflakes shaped as they are?]]
  * [[http://chemistry.stackexchange.com/questions/7674/is-there-an-easy-way-to-find-number-of-valence-electrons|Is there an easy way to find number of “valence electrons”?]]
  * [[http://chemistry.stackexchange.com/questions/67313/what-is-the-difference-between-atomic-hydrogen-and-nascent-hydrogen|What is the difference between “atomic hydrogen” and “nascent hydrogen”?]]
  * [[http://chemistry.stackexchange.com/questions/67874/can-drinking-a-lot-of-water-be-fatal|Can drinking a lot of water be fatal?]]
  * [[http://chemistry.stackexchange.com/questions/16135/how-to-determine-number-of-structural-isomers|How to determine number of structural isomers?]]
  * [[http://chemistry.stackexchange.com/questions/68455/structure-of-br3o8|Structure of Br3O8]]
  * [[http://chemistry.stackexchange.com/questions/4399/how-do-i-figure-out-the-hybridization-of-a-particular-atom-in-a-molecule|How do I figure out the hybridization of a particular atom in a molecule?]]
  * [[http://chemistry.stackexchange.com/questions/24182/what-is-the-white-substance-left-behind-after-boiling-down-water|What is the white substance left behind after boiling down water]]
  * [[https://chemistry.stackexchange.com/questions/69798/an-introduction-to-oxidation-state-oxidation-number|An introduction to “oxidation state”/“oxidation number”]]
  * [[http://chemistry.stackexchange.com/questions/70408/does-water-have-a-chemical-name|Does water have a chemical name?]]
  * [[http://chemistry.stackexchange.com/questions/70231/do-acids-really-donate-a-proton|Do acids really donate a proton?]] → **[[teaching:exos_les_acides_donnent_ils_vraiment_un_proton#les_acides_donnent-ils_vraiment_un_proton|Les acides donnent-ils vraiment un proton ?]]**
  * [[http://chemistry.stackexchange.com/questions/70117/is-this-a-violation-of-equipartition-theorem|Is this a violation of Equipartition theorem?]]
  * [[http://chemistry.stackexchange.com/questions/71417/why-alkanes-containing-even-number-of-carbons-can-be-packed-more-efficiently-tha|Why alkanes containing even number of carbons can be packed more efficiently than alkanes with odd number of carbon atoms?]]
  * [[http://chemistry.stackexchange.com/questions/608/choosing-the-right-condenser|Choosing the right condenser]]
  * [[http://chemistry.stackexchange.com/questions/71852/is-there-such-a-thing-as-an-acid-without-a-hydrogen|Is there such a thing as an acid without a hydrogen?]]
  * [[http://chemistry.stackexchange.com/questions/71707/why-do-different-h-in-polyprotic-acids-have-different-k|Why do different H+ in polyprotic acids have different K?]]
  * [[http://chemistry.stackexchange.com/questions/2883/what-is-charge-density|What is charge density?]]
  * [[https://chemistry.stackexchange.com/questions/72886/how-was-it-concluded-that-the-h3o-rather-than-h-is-the-acid-ion|How was it concluded that the H3O+ rather than H+ is the “acid” ion?]]
  * [[https://chemistry.stackexchange.com/questions/72700/can-other-substances-be-dissolved-in-a-saturated-solution|Can other substances be dissolved in a saturated solution?]]
  * [[https://chemistry.stackexchange.com/questions/72775/can-sodium-bicarbonate-be-considered-an-acid|Can sodium bicarbonate be considered an acid?]]
  * [[https://chemistry.stackexchange.com/questions/75100/is-it-possible-for-a-compound-to-be-soluble-in-a-mixture-of-solvents-but-not-the|Is it possible for a compound to be soluble in a mixture of solvents but not the individual solvents?]]
  * [[https://chemistry.stackexchange.com/questions/75093/why-doesnt-tetraiodine-exist|Why doesn't tetraiodine exist?]]
  * [[https://chemistry.stackexchange.com/questions/74816/is-the-term-heteroatom-reserved-for-exclusive-elements|Is the term “heteroatom” reserved for exclusive elements?]]
  * [[https://chemistry.stackexchange.com/questions/5477/why-is-it-important-to-use-a-salt-bridge-in-a-voltaic-cell-can-a-wire-be-used|Why is it important to use a salt bridge in a voltaic cell? Can a wire be used?]]
  * [[https://chemistry.stackexchange.com/questions/75153/why-are-dipoles-permanent-induced-dipole-permanent-induced-dipole-and-not-just|Why are dipoles “permanent/induced dipole permanent/induced dipole” and not just “permanent/induced dipole” once?]]
  * [[https://chemistry.stackexchange.com/questions/75573/in-the-bicarbonate-ion-why-can-the-hydrogen-not-bond-to-the-carbon|In the bicarbonate ion, why can the hydrogen not bond to the carbon?]]
  * [[https://chemistry.stackexchange.com/questions/75853/will-koh-work-in-place-of-naoh-as-the-electolyte-in-the-electrolysis-of-water|Will KOH work in place of NaOH as the electolyte in the electrolysis of water?]]
  * [[https://chemistry.stackexchange.com/questions/75597/why-does-chocolate-melt-so-easily|Why does chocolate melt so easily?]]
  * [[https://chemistry.stackexchange.com/questions/4092/why-does-a-substance-with-an-endothermic-heat-of-solution-dissolve|Why does a substance with an endothermic heat of solution dissolve?]]
  * [[https://chemistry.stackexchange.com/questions/13949/what-allows-sulfur-and-phosphorus-to-expand-their-octet|What allows sulfur and phosphorus to expand their octet?]]
  * [[https://chemistry.stackexchange.com/questions/16497/why-does-zn-react-with-naoh|Why does Zn react with NaOH?]]
  * [[https://chemistry.stackexchange.com/questions/76066/an-ionic-compound-dissociates-into-3-ions-of-3-different-elements|An ionic compound dissociates into 3 ions of 3 different elements?]]
  * [[https://chemistry.stackexchange.com/questions/75934/if-polyethylene-glycol-peg-is-hygroscopic-how-does-it-protect-wood|If polyethylene glycol (PEG) is hygroscopic, how does it protect wood?]]
  * [[https://chemistry.stackexchange.com/questions/28499/relation-between-molar-mass-and-van-der-waals-force|Relation between molar mass and van der Waals force]]
  * [[https://chemistry.stackexchange.com/questions/59262/difference-between-electropositivity-and-electronegativity|Difference between electropositivity and electronegativity]]
  * [[https://chemistry.stackexchange.com/questions/76505/why-does-whipped-cream-use-nitrous-oxide-instead-of-nitrogen-gas|Why does whipped cream use nitrous oxide instead of nitrogen gas?]]
  * [[https://chemistry.stackexchange.com/questions/4310/what-is-the-reaction-between-oxalic-acid-and-potassium-permanganate|What is the reaction between oxalic acid and potassium permanganate?]]
  * [[https://chemistry.stackexchange.com/questions/76736/a-glass-of-water-with-ice-cubes-in-it-wheres-the-water-the-coldest-at-the-top|A glass of water with ice-cubes in it. Where's the water the coldest; at the top or bottom?]]
  * [[https://chemistry.stackexchange.com/questions/76726/why-is-it-wrong-to-use-the-concept-of-hybridization-while-studying-complexes|Why is it wrong to use the concept of “hybridization” while studying complexes?]]
  * [[https://chemistry.stackexchange.com/questions/76757/why-does-mercury-decolourise-a-gold-ring|Why does mercury decolourise a gold ring?]]
  * [[https://chemistry.stackexchange.com/questions/4058/saturated-vs-unsaturated-fats-structure-in-relation-to-room-temperature-state|Saturated vs unsaturated fats - Structure in relation to room temperature state?]]
  * [[https://chemistry.stackexchange.com/questions/44260/what-is-the-difference-between-d-and-l-configuration-and-and-%E2%88%92|What is the difference between D and L configuration, and + and −?]]
  * [[https://chemistry.stackexchange.com/questions/80249/can-i-eat-the-lemons-after-i-have-used-them-as-a-battery|Can I eat the lemons after I have used them as a battery?]]
  * [[https://chemistry.stackexchange.com/questions/80231/explanation-of-lemon-juice-invisible-ink|Explanation of Lemon Juice-Invisible Ink]]
  * [[https://chemistry.stackexchange.com/questions/27535/percentage-ionic-character-if-electronegativity-is-given|Percentage ionic character if electronegativity is given]]
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===== Autres sites de questions et réponses =====
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  * [[https://www.quora.com/topic/Chemistry]]
  * [[https://www.reddit.com/r/chemistry/|Reddit Chemistry]]
  * [[https://www.reddit.com/r/ScienceEducation/|Reddit Science Education]]
  * [[https://www.reddit.com/r/educationalgifs/|For .gifs that provide knowledge!]]
  * ...

===== Questions diverses =====
  * [[http://www.slate.fr/story/67469/gaz-odeur-pourquoi|Ça sent le gaz, mais pourquoi le gaz sent?]] Michel Alberganti — 22 janvier 2013
  * [[https://www.researchgate.net/post/Can-Gibbs-energy-of-formation-be-calculated-from-enthalpy-and-entropy|Can Gibbs energy of formation be calculated from enthalpy and entropy?]]