Khan Academy
7 713 vidéos, +5 400 000 abonnés

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Showing segment congruence equivalent to having same length6:451 286
Area models for multiplying expressing with negative terms5:176 967
Hydrogen bonds6:395 501
Intermolecular forces and vapor pressure6:406 882
Ion-dipole forces4:404 743
Dipole dipole forces6:467 234
Guided meditation for procrastination7:0021 707
Guided meditation visualizing thoughts as the surface of an ocean7:296 157
London dispersion forces9:434 654
Guided meditation for high school students12:5115 524
The development of an American culture | AP US History | Khan Academy9:589 713
Showing segment congruence equivalent to having same length4:562 871
Idea behind hypothesis testing9:5816 129
Conclusion for a two sample t test using a P value2:499 704
Dilating shapes: shrinking | Performing transformations | High school geometry | Khan Academy2:264 466
Health insurance primer8:2712 932
Mapping shapes | Performing transformations | High school geometry | Khan Academy8:504 182
The Court in Action | AP US Government and Politics | Khan Academy6:125 755
Help Jason Give Back to Khan Academy1:4319 932
Formal charge | Molecular and ionic compound structure and properties | AP Chemistry | Khan Academy7:3013 762
Millions Learn for Free, Made Possible by People Like You1:109 981
Resonance | Molecular and ionic compound structure and properties | AP Chemistry | Khan Academy7:2410 655
Exceptions to the octet rule | AP Chemistry | Khan Academy7:104 248
Worked example: Lewis diagram of xenon difluoride (XeF₂) | AP Chemistry | Khan Academy3:113 054
Worked example: Lewis diagram of the cyanide ion (CN⁻) | AP Chemistry | Khan Academy4:284 871
Drawing Lewis diagrams | AP Chemistry | Khan Academy7:804 027
Worked example: Lewis diagram of formaldehyde (CH₂O) | AP Chemistry | Khan Academy6:802 123
Give a gift that will change a life.0:2132 605
Causation from 1980-20209:4311 821
Worked example: Using formal charges to evaluate nonequivalent resonance structures | Khan Academy8:206 221
Structure of alloys6:303 334
Structure of ionic solids5:433 502
All in for Education Livestream with Sal Khan39:5715 539
Lattice Energy8:103 696
All in for Education with Khan Academy. Give today!1:1016 719
Interpreting potential energy and internuclear distance graph5:213 910
You Can Learn Anything (30 sec)0:318 693 941
Bond distance and potential energy6:425 768
Spectrum of bonds and electronegativity4:435 715
Types of bonds between metals and non metals5:124 502
Electron configuration of ions3:568 899
Khan Stories: Jason Spyres4:7031 659
What to do the night before an exam: 3 tips from Sal Khan1:2539 332
Ionic bonds4:109 838
Covalent and polar covalent bonds5:434 216
Metallic bonds3:004 407
Isotopes5:286 327
Mass spectrometry introduction4:186 684
Making line plots with fractional data3:152 273
Interpreting line plots2:451 039
Line plots with fractions3:36816
Measure lengths to nearest 1/42:13999
Multiplication and division relationship for fractions3:352 181
Dividing fractions and whole number word problems4:261 027
Fraction division in context3:22688
Mass spectrum for identifying element3:214 322
Calculating percent mass of an element5:383 493
Example calculating moles in mass of sample5:496 202
How to reduce test prep anxiety: 3 tips from Sal Khan4:4248 841
Course Mastery Sal (intro only)2:6030 867
Mastery Learning in Mr. Vandenberg’s Class4:498 602
Continuity and change in American society, 1754-1800 | AP US History | Khan Academy9:1110 322
Introduction to the mole and Avogadro's number8:5710 184
Introduction to average atomic mass8:388 924
Subtracting fractions with unlike denominators introduction3:369 399
Emperical formula from mass composition4:352 407
Adding fractions with unlike denominators introduction4:206 538
Fraction multiplication as scaling examples3:385 469
Estimating adding fractions with unlike denominators4:572 795
Coulomb's Law and trends in the periodic table10:4311 636
Groups, valence electrons and ionic compounds7:552 592
Example using ionization energies to identify element2:312 171
Groups of the periodic table7:413 598
Introduction to photoelectron spectroscopy8:241 551
Aufbau principle for electron configuration7:532 918
Introduction to photoelectron spectroscopy8:241 533
Percent composition of mixtures6:411 139
Valence electrons5:111 251
Orbitals, shells and energy levels9:4110 285
Introduction to electron configuration5:805 065
Worked example Percent composition of a mixture5:213 631
Percent composition of mixtures6:291 960
Empirical formula from combustion reaction10:20900
Example comparing mass percentages of element in comounds3:00600
Effects of transatlantic voyages, 1492-1607 | Khan Academy | AP US History7:246 525
Equivalent fractions on number lines4:344 491
Comparing fractions word problems5:701 112
Equivalent fractions with models5:364 567
Subtracting mixed numbers with regrouping3:00947
Multiplying mixed numbers2:24815
Fraction multiplcation on the number line3:10524
Mixed number subtraction2:181 143
Mixed number addition with regrouping3:401 058
Adding mixed numbers with like denominators2:53398
Reform in the Gilded Age | AP US History | Khan Academy8:806 464
Area models for factoring expressions3:504 415
Multiplying expressions with area models4:601 662
Interpreting features of a quadratic model2:371 216
Worked examples factoring completely4:001 299
Exponential decay word problems4:00716

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