H3 Chemistry

3D models of both enantiomers of 1-bromo-1-chloroethane are available to help students visualize the stereocentre in 3D, rotation of lowest priority group into paper plane and clockwise/anticlockwise arrangements of other substituents.

Link: https://jacksonkoh8.github.io/final-r-s-1-bromo-1-chloroethane-multimodel/

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3D models of 2,3-dichlorobutane (acyclic meso compound) are shown. Students can touch the screen with 3 fingers to see how one of the 3D model can be rotated to show that mirror images of a meso compound are identical.

The models can be manipulated independently by touching on the left and right sides of the screen.

Link: https://jacksonkoh8.github.io/final-meso-2-3-dichlorobutane-ani/

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3D model of 2-bromo-2-chlorobutane can be rotated in space to show Newman projection, sawhorse projection and even Fischer projection. Students can better relate these 2D diagrams with the actual 3D structure of the molecule from different perspective.

Link: https://jacksonkoh8.github.io/final-r-2-bromo-2-chlorobutane/

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Animated 3D models of simple alkanes (up to 4 carbons) are shown to help students visualise the energy barriers (torsional and steric strains) to rotation. Students can touch the screen with 1 finger to pause the rotation of the molecule to appreciate the different strains and conformations.

Link: https://jacksonkoh8.github.io/final-ethane-propane-butane-conformations/

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3D models of simple cycloalkanes (up to 6 carbons) are shown to help students visualise the angle strain and torsional strain present in different ring sizes. The cyclohexane 3D model is also useful to help students visualise and draw the chair conformation, identify axial and equatorial substituents.

Link: https://jacksonkoh8.github.io/final-cycloalkanes/

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Mechanism of E2 is animated using 3D models to emphasize on the conformation requirements and the movement of electrons to form new bond. The Newman projection perspective is also shown to help students visualise the mechanism side-on. Further discussions can be made on the concerted nature of the mechanism, reaction kinetics and orbital interactions.

Press "Next" or "Back" buttons to navigate the different stages of the mechanism.

Link: https://jacksonkoh8.github.io/final-E2-mechanism/

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Mechanism of E1 is animated using 3D models to emphasize on the conformation requirements and the movement of electrons to form new bond. The Newman projection perspective is also shown to help students visualise the mechanism side-on. Further discussions can be made on the reaction kinetics, orbital interactions and different energies of the conformers leading to different distribution of products.

Press "Next" or "Back" buttons to navigate the different stages of the mechanism.

Link: https://jacksonkoh8.github.io/final-E1-mechanism/

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