CHEM1831 Lecture Notes - Lecture 4: Electromagnetic Spectrum, Aspirin, Molar Mass
9 Aug 2018
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Number of moles = mass / molar mass. C 51. 7 h2. 90 cr 12. 42 n 10. 06 o 22. 92. Emperical mass is the number for emperical formula x the weight to get the mass of the substance. Quantamechanics - smooth surface e. g ramp - go up smoothly. Optical fibres - allow transmission of light without any loss in intensity. Light is quantised - it is a particle and a wave. Matter can gain or lose energy only in small specific amounts called quanta. A quantum is the minimum amount of energy that can be gained or lost by an atom. Planks constant has a value of 6. 626 x 10^-34. A photon is : a particle of electromagnetic radiation, carries a quantum of emr energy, has no mass, has speed of c=3. 0x10^8m s^-1. Atomic deexcitation higher inital energy level lower final energy level. Emission of a photon occurs hen an electron. Atoms of other elements also have characteristic atomic spectra.
