Calculate Vector Addition Dipole Moments of Molecules?
Dipole moments occur when there is a separation of charge. When atoms in a molecule share electrons unequally, they create what is called a dipole…
Chemistry
Calculate the Absorption of Light by Polar Molecules?
It is possible to arrange molecules so that the bond dipoles all point in a particular direction. Below Figure shows the alignment of carbonyl bonds…
Time of Flight Mass Spectrometer
A time of flight (TOF) mass spectrometer is sketched below- The TOF MS is all under a vacuum. A pulsed laser fires a pulse of…
Sample Question: Hydrogen Halide Dipole Moments
The magnitudes of the four hydrogen halide dipoles are given below. Firstly, using vector notation, express the magnitudes of the HF, HBr and the HI…
Sample Question: HMO Theory for Cyclopropenyl Cation, Radical and Anion
Sample Question: HMO Theory for Cyclopropenyl Cation, Radical, and Anion. (a) Write down the Hiickel secular determinant for the cyclic three C-atoms in terms of…
Sample Question: HMO Theory for 1,3-Butadiene
(a) Write down the Hiickel secular determinant for the four C-atoms of butadiene in terms of x, where x = (α – E)/β. (b) Solve…
Sample Question: HMO Theory for the Allyl Cation, Radical and Anion
=> Write down the Hiickel secular determinant for the acyclic three C-atoms in terms of x, where x = (α – E)/ β. => Solve…
Chemical Analysis of the Spectra of Three or More Components
A student in their lab dass measured the following spectroscopic data for some pure samples of three indicators thymol blue (TB), semithymol blue (STB) and…
Chemical Analysis of Well Separated Spectral Regions
For a single absorbing molecular species in solution, the Beer-Lambert Law states that A = Ɛ l c where A is the absorbance, e is…
What is the Speed of Chemical Reactions?
The Arrhenius equation is an important equation in chemical reactions kinetics where k is the rate constant, A is the pre-exponential factor, Ea the activation…
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