Tap OChem 4.74 - App Store

Tap OChem version 4.74

Updated At: 2026-06-07

Changes: Version History We added a new animation: induced dipole/induced dipole attractive forces. It animates the interactions between ethane molecules. We updated the pKa table and the typical bonding table in the reference section. We fixed an error in our sp and sp2 hybrid orbital animations with too many electrons in the starting atomic orbitals. Enjoy! 4.74 11/06/2023 We added a new animation on Alcohols Reactions with Hydrogen Halides. It summarizes the different reactivities based on alcohol substitution including reaction rate equations and reaction coordinate diagrams. We did fix a few minor typos as well! Enjoy! 4.73 01/15/2023 We added two new animations: 1. Dipole/dipole attractive forces between molecules and 2. Radical hydrobromination addition of alkenes! We improved one animation by incorporating electrostatic potential maps: SN2 Run with R-X, Electron Pushing. We did fix a few minor typos as well! Enjoy! 4.72 10/09/2022 All 170+ animations and accurate descriptions of organic chemistry concepts, reactions, and molecules, from earlier versions are present. We've added one animation on the acidity of alkanes, alkenes and alkynes. This animation is another way of explaining hybridization of hydrocarbons vs. acidity. We also tweaked some information screens to fix minor typos. 4.71 09/16/2021 All 170+ animations and descriptions of organic chemistry concepts, reactions, and molecules, from earlier versions are present. We've tweaked one animation and added four new animations with the aromatic heterocycles pyrrole and pyridine. The animations show the flat geometries of the heterocyclic and their electrostatic potential maps. The narrated animation in concepts section on IR spectroscopy now includes sound. 4.70 05/30/2021 All 160+ animations from earlier versions are present. We've tweaked a few and added four new animations - spin density maps for methyl, ethyl, allyl, and benzyl radicals! We've updated benzene directing and activating reference sheet with electrostatic potential maps of many. All plotted with the same color range! 4.69 04/19/2021 All 160+ animations from earlier versions are present. This were minor tweaks and a minor updates to fix two animations. 4.68.2 10/29/2020 All 160+ animations from earlier versions are present. This were minor tweaks and a minor update to fix one animation. 4.68.1 10/02/2020 This version updates bugs for Tap OChem to run properly on iOS 14. All 160+ animations are retained from the previous versions 4.67 and 4.66. 4.68 09/28/2020 This version updates Tap OChem to run properly on iOS 14. All 160+ animations are retained from the previous version 4.66. 4.67 09/19/2020 Added 6 new animations and improved 5 animations! We've improved one reference sheet and added a new one. Both relate to SN1 vs SN2 vs E1 vs E2. Five of the new animations topics are on carbocation rearrangements. The other topic is on SN1 reactions with allyl halides! See the "Help> Whats New" information for details. 4.66 03/03/2020 Added 3 new animations and improved 3 animations! Improved one reference sheet. The new and improved animations include the topics of electrostatic potential maps, and molecular orbitals. See the "Help> Whats New" information for details. 4.65 09/16/2019 Added 21 new animations and improved 61 animations! The new animations include the topics of electrostatic potential maps, more molecular orbitals, and infrared spectroscopy. See the "Help> Whats New" information for details. 4.64 08/17/2019 This update continues to upgrade Tap OChem! We upgraded 4 animations! 1) Acetal and Hemiacetal Formation, narrated; 2) Diels-Alder 1 Fundamentals, narrated; 3) Diels-Alder 2 Diene and Dienophile Substituents, narrated; and 4) Diels-Alder Stereochemistry, Dienophiles, Endo Rule, narrated. 4.63 03/27/2019 This update continues to upgrade Tap OChem! We added the animation, Allyl Radical Molecular Orbitals, and upgraded 12 animations! 1) Enantiomers, narrated; 2) Diastereomers, narrated; 3) Meso Molecules, narrated; 4) Cis-trans Alkenes are Diastereomers, narrated; 5) Benzene and Stability, narrated; 6) Benzene and Huckel, narrated; 7) Alkene Stability, Part 1; 8) Alkene Stability, Part 2; 9) Dienes and Stability; 10) Keto-Enol Tautomerization, Base conditions; 11) Keto-Enol Tautomerization, Acid Conditions; 12) Alpha Halogenation, Acid Conditions. In addition to adding a few values to the two reference tables, pKa, and Bond Dissociation Energies, we've fixed a few typos. 4.61 02/25/2019 We've improved one animation, hydroboration-oxidation of alkenes, with our standard font. In addition, we've added electron pushing and improved several animations with our new format! These are 1. trans alkenes from alkynes; 2. trans alkenes from alkynes, narrated; 3. E1 reaction with alkyl halides; 4. E1 Reaction with alkyl halides, reaction coordinate; 5. E2 reaction with alkyl halides; 6. E2 reaction with alkyl halides, reaction coordinate; 7. SN1 reaction with alkyl halides; 8. SN1 reaction with alkyl halides, reaction coordinate; 9. Electron pushing in the SN1 reaction with alkyl halides; 10. SN2 reaction with R-X, methylsulfide nucleophile; 11. Radical stability, hyperconjugation, narrated; 12. Diels-Alder I; 13. Diels-Alder II, endo rule; 14. SN2 reaction with R-X, methylsulfide nucleophile, reaction coordinate; 15. E1 reaction with alkyl halides, electron pushing, narrated; 16. E2 reaction with alkyl halides, electron pushing, narrated; 17. Cyanohydrin Formation, HCN addition. 4.60 02/06/2019 This update tweaked existing animations. The sp and sp2 hybrid orbital animations were fixed with the correct number of electrons in the starting atomic orbitals. Improvements in the carbonyl hydration animation and SN1 reaction with alcohols were made. One reference sheet on Alkene Stability was updated. 4.57 08/31/2018 Several animations were improved by updating with our new format and added electron pushing in line-bond structures. The improved animations are 1) Alkyne Alkylation; 2) E1 Reactions of Alcohols; 3) E2 Reactions of Alcohols; 4) E1 Reactions of Alcohols, Reaction Coordinate; 5) Cyclohexane Energy Diagram; 6) Hydration of Carbonyls, Basic Conditions; 7) Hydration of Carbonyls, Acidic Conditions; 8) E2 Reactions, Regiochemistry 1; 9) E2 Reactions, Regiochemistry 2; 10) Lindlar Catalyst Reduction of Alkynes; 11) Alkene Catalytic Hydrogenations. 4.56 06/15/2018 Several animations were improved by updating with our new format and added electron pushing in line-bond structures. The improved animations are 1) Benzene Sulfonation; 2) Benzene Sulfonation, Reaction Coordinate; 3) Benzene Nitration; 4) Benzene Nitration, Reaction Coordinate Diagram; 5) Frieden-Crafts Alkylation; 6) Friedel Crafts Acylation; 7) Epoxides from Halohydrins; 8) Acid Catalyzed Ring Opening of Epoxides; 9) Nucleophilic Ring Opening of Epoxides 4.55 05/05/2018 Two new animations were added to the 130+ animations retained from previous versions. In the Concepts-Molecular Orbital Theory we added methane's MOs and Benzene pi MOs! In addition we updated 9 original animations, Benzene Bromination, Benzene Bromination Reaction Coordinate Diagram, Cyclohexane Conformations, Cyclohexane Conformations narrated, Cyclohexane Energy Diagram narrated, Free Radicals I Stability narrated, Epoxide Mechanism, Butadiene Rotation, and Butadiene Rotation narrated. We've also optimized all decreasing the size of the app so we have more space for future new animations! 4.50 04/01/2018 Five new animations were added to the 130+ animations retained from previous versions. In the Concepts-Intermediates section, two animations are now included: Hyperconjugation with the tert-Butyl Radical, and Hyperconjugation with the tert-Butyl Cation! These animations complement our animations on radical stability and carbocation stability. We have a new category in Concepts: Molecular Orbital Theory! In addition to the SN2 reactions with R-X that was updated in the 4.30 release, we've included three new animations in this catagory: 1) ethene, pi molecular orbitals, 2) allyl cation, pi molecular orbitals, and 3) 1,3-butadiene, pi molecular orbitals. 4.40 02/05/2018 This minor release is a fix for a typo error on the tert-butyl radical molecule. Version 4.3 has of the animations in the "Molecules" section were increased in length and enhanced with new backgrounds. There are enhancements in many other animations, including electron pushing in line drawings, improved "look and feel" of ten more existing animations. Eleven other existing animations were improved as well. Two new animations were added: 1) Bromination of Alkenes, narrated and 2) Hydrogen Halide Addition to Alkenes, narrated. Further details of all enhancements are found in the Help-Whats New section of the app. 4.31 01/22/2018 All of the animations in the "Molecules" section were increased in length and enhanced with new backgrounds. There are enhancements in many other animations, including electron pushing in line drawings, improved "look and feel" of ten more existing animations. Eleven other existing animations were improved as well. Two new animations were added: 1) Bromination of Alkenes, narrated and 2) Hydrogen Halide Addition to Alkenes, narrated. Further details of all enhancements are found in the Help-Whats New section of the app. 4.30 01/16/2018 We've added three new narrated Diels-Alder animations and tweaked the menu system with more cross referencing! The three new animations are the first three in a series of Diels-Alder animations under development. The animations are: Diels-Alder 1 Fundamentals; Diels-Alder 2 Diene and Dienophile Substituents; and Diels-Alder 3 Dienophiles, Stereochemistry, Endo Rule. Enjoy! 4.20 02/06/2017 This upgrade to iOS version 10 adds eleven new animations and five new reference tables! Animation additions: 1) SN2 of Alkyl Halides with Hydroxide was supplemented in Reactions > SN1 and SN2, Substitution Rxn Chemistry in addition to keeping our legacy animation. The new animation has a animated line drawing as well as a lighter background classroom optimization. 2) SN2 of Alkyl Halides with Hydroxide, Rxn Coordinate were supplemented in Reactions > SN1 and S 2, Substitution Rxn Chemistry in addition to keeping our legacy animation. The new animation has a animated line drawing as well as a lighter background classroom optimization. 3) SN2 of Alkyl Halides with Large Nucleophilies shows the SN2 reaction with methyl sulfide. This is found in the Reactions SN1 and SN2, Substitution Rxn Chemistry section. 4) SN2 of Alkyl Halides with Large Nucleophilies Rxn Coordinate shows the SN2 reaction with methyl sulfide. These is found in the Reactions > SN1 and SN2, Substitution Rxn Chemistry section. 5) N,N-Dimethylformamide, in the Molecules > Carbonyl Compounds section shows the restricted rotation of the carbonyl carbon to nitrogen bond. 6) N,N-Dimethylformamide Rotation and Orbitals, in the Molecules > Carbonyl Compounds section shows the restricted rotation of the carbonyl carbon to nitrogen bond with a more advanced concept of orbital changes during the rotation. 7) Butadiene in the Molecules > Acyclic Hydrocarbons section. 8) Butadiene with p orbitals in the Molecules > Acyclic Hydrocarbons section. 9) The ninth animation can be found in Concepts > Stereochemistry, cis trans Alkenes are Diastereomers. 10) The tenth animation is found in Reactions > Carbonyl Chemistry, Acetal and Hemiacetal Formation, narrated. 11) The last animation is found in Concepts > Cyclohexane Conformational Analysis, Drawing Cyclohexane's Chair Conformation, narrated. To the Reference > Alkanes and Cycloalkanes section, we added four tables: 1) Linear Alkane Names. 2) Common Names of Alkyl Substituents and Abbreviations. 3) Carbon and Hydrogen Classifications and 4) Ring Size and Strain Energy. 4) Ring Size and Strain Energy. To the Reference > Essential Information and Periodic Table section, we added: 5) C-C and C-H Bond Lengths. We have also cross referenced concept menu items in several of our reaction menus. 4.10 11/30/2016

Tap OChem version 4.74

Updated At: 2023-11-06

Changes: Nov 6, 2023 Version 4.74 We added a new animation: induced dipole/induced dipole attractive forces. It animates the interactions between ethane molecules. We updated the pKa table and the typical bonding table in the reference section. We fixed an error in our sp and sp2 hybrid orbital animations with too many electrons in the starting atomic orbitals. Enjoy!

Tap OChem version 4.74

Updated At: 2023-11-06

Changes: We added a new animation: induced dipole/induced dipole attractive forces. It animates the interactions between ethane molecules. We updated the pKa table and the typical bonding table in the reference section. We fixed an error in our sp and sp2 hybrid orbital animations with too many electrons in the starting atomic orbitals. Enjoy!

Tap OChem version 4.73

Updated At: 2023-01-15

Changes: Jan 15, 2023 Version 4.73 We added a new animation on Alcohols Reactions with Hydrogen Halides. It summarizes the different reactivities based on alcohol substitution including reaction rate equations and reaction coordinate diagrams. We did fix a few minor typos as well! Enjoy!

Tap OChem version 4.71

Updated At: 2021-09-16

Changes: Sep 16, 2021 Version 4.71 All 170+ animations and accurate descriptions of organic chemistry concepts, reactions, and molecules, from earlier versions are present. We've added one animation on the acidity of alkanes, alkenes and alkynes. This animation is another way of explaining hybridization of hydrocarbons vs. acidity. We also tweaked some information screens to fix minor typos.

Tap OChem version 4.70

Updated At: 2021-05-30

Changes: May 30, 2021 Version 4.70 All 170+ animations and descriptions of organic chemistry concepts, reactions, and molecules, from earlier versions are present. We've tweaked one animation and added four new animations with the aromatic heterocycles pyrrole and pyridine. The animations show the flat geometries of the heterocyclic and their electrostatic potential maps. The narrated animation in concepts section on IR spectroscopy now includes sound.

Tap OChem version 4.69

Updated At: 2021-04-19

Changes: Apr 19, 2021 Version 4.69 All 160+ animations from earlier versions are present. We've tweaked a few and added four new animations - spin density maps for methyl, ethyl, allyl, and benzyl radicals! We've updated benzene directing and activating reference sheet with electrostatic potential maps of many. All plotted with the same color range!

Tap OChem version 4.68.2

Updated At: 2020-10-29

Changes: Oct 29, 2020 Version 4.68.2 All 160+ animations from earlier versions are present. This were minor tweaks and a minor updates to fix two animations.

Tap OChem version 4.68.1

Updated At: 2020-10-02

Changes: Oct 2, 2020 Version 4.68.1 All 160+ animations from earlier versions are present. This were minor tweaks and a minor update to fix one animation.

Tap OChem version 4.68

Updated At: 2020-09-28

Changes: Sep 28, 2020 Version 4.68 This version updates bugs for Tap OChem to run properly on iOS 14. All 160+ animations are retained from the previous versions 4.67 and 4.66.