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Posted inPhysical Chemistry
The mechanical equivalence of work and energy
Two of the architects of modern thermodynamics were William Thompson (better known as Lord Kelvin)…
Posted inPhysical Chemistry
Endothermic reactions
We all sweat at some time or other, e.g. after running hard, living We need…
Posted inPhysical Chemistry
Energy and the first law of thermodynamics
Eating ice cream soon causes the mouth to get cold, possibly to Ice cream melts…
Posted inPhysical Chemistry
First electron affinity and reactivity
Gases such as helium, neon and argon are so unreactive that we Krypton, xenon and…
Posted inPhysical Chemistry
Electron affinity
Lightning is one of the more impressive manifestations of the power in nature: the sky…
Posted inPhysical Chemistry
Properties of covalent compounds
Clear petroleum gel is a common product, comprising a mixture of simple hydrocarbons, principally n-octadecane…
Posted inPhysical Chemistry
Covalent bonds and valence
The water molecule always has a composition in which two hydrogen atoms combine with one…
Posted inPhysical Chemistry
Breaking bonds requires an input of energy
A plant accumulates nutrients from the soil as it grows. Such accumulation depletes the amount…
Posted inPhysical Chemistry
Hydrogen bonds
DNA is a natural polymer. It was first isolated in 1869 by Meischer, but its…
Posted inPhysical Chemistry
Elastic and inelastic collisions
In the previous example, we looked at the interactions induced when changing the external pressure,…