NATS 1870 Lecture Notes - Lecture 9: Red Cabbage, Phenolphthalein
8 Nov 2017
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Document Summary
A brief history of chemistry, and the development of chemistry, as an applied science was driven by a quest for colour. The way a molecule is formed to create a colour. The structure and bonds determine the spacing of the energy orbits/levels. Like atoms, electrons can jump to higher energy levels when they absorb a photon with particular energy or wavelength. The structure of the molecules is more complicated, each of the energy levels can, be subdivided. Electron bonds can vibrate which gives a rise to vibrational energy states. Molecules can rotate around di erent axes which gives a rise to rotational energy states. In colorants (dyes and pigments) usually one section of molecules responsible for absorbing visible wavelengths of light. Covalent bonds have equally shared electron pairs and a. Double covalent is most common in colorants https://qph. ec. quoracdn. net/main-qimg-0aa199c95152dc7d46c4f67babf33644. Benzene is a common molecule component of colorants yet is colourless. It is possible to modify the wavelengths it absorbs.
