The probability P that an electron is a distance r from the nucleus is called the radial distribution function. The hydrogen atom’s is electron radial distribution function is Where a0 is a constant called the…

A polyene molecule is a linear hydrocarbon chain of alternating single and double bonded C-atoms. Polyene molecules are important in biological processes and below Figure shows such a short polyene molecule. Because of the alternation…

The enthalpy of a molecule, H, changes by dH when the temperature, T, changes by dT and the change is commonly given as a polynomial equation dH = (a + bT + -cT2) dT Calculate…

We have one mole of ideal gas at an initial volume of 4.90×103 cm3 which expands to a final volume of 2.45×104 cm3 at a constant temperature T = 298 K. Using your solution from…

In Chemistry it is very common to have gases being formed, reacting, compressed or expanding. A simple way of understanding such processes is to begin with a “mechanical” picture of a gas trapped inside a…

If the overall (or stoichiometric) reaction is two molecules of A reacting to give products 2A → P with rate constant k then for some mechanisms we may have a second-order reaction. An example of…

The decay of a radioactive element A → P has a rate constant k. Radioactive decay is a first-order chemical reaction with [A] and t being the variables of the equation. d[A] / dt =…

[B] = [A]0 [k1 /(k2 – k1) (e-k1t – e-k2t) By consideration of each of the terms of the equation find approximate expressions for [B] and d[B]/dt when k1 is very much larger than k2…

[B] = [A]0 [k1 /(k2 – k1) (e-k1t – e-k2t) By consideration of each of the terms in the equation show that if k2 is very much larger than k1 i.e. k2 » k1 then…

Two chemical reactions consecutively follow on from one another. Consecutive reactions are generally very common in biochemistry and organic chemistry.  K1     k2 A → B → C A common situation is for k1, to be…