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Resources

Khan Academy: Stereochemistry

2014-12-23T14:19:00+00:00

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These video resources from the Khan Academy give clear explanations of the difficult concept of stereochemistry.

NOTE: All Khan Academy content is available for free at www.khanacademy.org

Websites

  • Stereochemistry: Introduction to chirality

  • Stereochemistry: Chiral Examples 1

  • Stereochemistry: Chiral Examples 2

  • Stereochemistry: Chirality centres and stereoisomers

  • Stereochemistry: R,S System for Determining Absolute Configuration

  • Stereochemistry: R, S System for Cyclic Compounds

  • Stereochemistry: Optical Activity I - Theory

  • Stereochemistry: Optical Activity II - Calculations

  • Stereochemistry: Diastereomers

  • Stereochemistry: Meso Compounds

  • Stereochemistry: Fischer Projections

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Level

  • 16-18 years
  • 18+

Use

  • Video
  • Website

Category

  • Study skills
  • Working independently
  • Structure and bonding
  • Organic chemistry

Specification

  • Northern Ireland
    • A/AS level
      • CCEA Chemistry
        • Unit A2 1: Further Physical and Organic Chemistry
          • 4.6 Isomerism
            • 4.6.2 recall that asymmetric (chiral) centres give rise to optical isomers that exist as non-superimposable mirror images;
            • 4.6.3 draw 3D representations of optical isomers;
  • Scotland
    • Advanced Higher
      • SQA Chemistry
        • Organic chemistry and instrumental analysis
          • Stereochemistry
            • Stereochemistry
              • Stereoisomers are molecules with the same molecular formula but which have a different spatial arrangement of their atoms.
            • Optical isomerism
              • Optical isomerism occurs in substances in which four different substituent groups are arranged around a central carbon atom called the chiral centre.
  • Wales
    • A/AS level
      • WJEC Chemistry
        • Unit 4: ORGANIC CHEMISTRY AND ANALYSIS
          • 4.1 Stereoisomerism
            • (a) how stereoisomerism is distinct from structural isomerism and that stereoisomerism encompasses E‒Z isomerism and optical isomerism
            • (b) the terms chiral centre, enantiomer, optical activity and racemic mixture
            • (c) optical isomerism in terms of an asymmetric carbon atom
            • (d) effect of an enantiomer on plane-polarised light
  • England
    • A/AS level
      • AQA Chemistry
        • Organic chemistry
          • Introduction to organic chemistry
            • Isomerism
              • Structural isomerism.
              • Stereoisomerism.
              • E–Z isomerism is a form of stereoisomerism and occurs as a result of restricted rotation about the planar carbon–carbon double bond.
              • Cahn–Ingold–Prelog (CIP) priority rules.
              • Students should be able to: define the term structural isomer.
              • Draw the structures of chain, position and functional group isomers.
              • Define the term stereoisomer.
              • Draw the structural formulas of E and Z isomers.
              • Apply the CIP priority rules to E and Z isomers.
          • Optical isomerism
            • Optical isomerism is a form of stereoisomerism and occurs as a result of chirality in molecules, limited to molecules with a single chiral centre.
            • An asymmetric carbon atom is chiral and gives rise to optical isomers (enantiomers), which exist as non superimposable mirror images and differ in their effect on plane polarised light.
            • A mixture of equal amounts of enantiomers is called a racemic mixture (racemate).
            • Students should be able to: draw the structural formulas and displayed formulas of enantiomers.
            • Understand how racemic mixtures (racemates) are formed and why they are optically inactive.
      • Edexcel Chemistry
        • Topic 17: Organic Chemistry II
          • Topic 17A: Chirality
            • 1. know that optical isomerism is a result of chirality in molecules with a single chiral centre
            • 2. understand that optical isomerism results from chiral centre(s) in a molecule with asymmetric carbon atom(s) and that optical isomers are object and nonsuperimposable mirror images
            • 3. know that optical activity is the ability of a single optical isomer to rotate the plane of polarisation of plane-polarised monochromatic light in molecules containing a single chiral centre
            • 4. understand the nature of a racemic mixture
            • 5. be able to use data on optical activity of reactants and products as evidence for SN1 and SN2 mechanisms
      • OCR Chemistry A
        • Module 4: Core organic chemistry
          • 4.1 Basic concepts and hydrocarbons
            • 4.1.3 Alkenes
              • cii) use of Cahn–Ingold–Prelog (CIP) priority rules to identify the E and Z stereoisomers
        • Module 6: Organic chemistry and analysis
          • 6.2 Nitrogen compounds, polymers and synthesis
            • 6.2.2 Amino acids, amides and chirality
              • c) optical isomerism (an example of stereoisomerism, in terms of non-superimposable mirror images about a chiral centre)
              • d) identification of chiral centres in a molecule of any organic compound.

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