Wissam Yehya

Taxol Paclitaxel (Taxol) is a drug used to treat several different forms of cancer Discovery In 1960, the American National Cancer Institute (NCI) conducted analysis of several plant materials Pacific yew tree bark showed good activity against certain kind of cancer The obtained material was then fractioned using multi-step portioning and then a pure extract…

A-Level Chemistry : Reaction Kinetics

A-Level Chemistry : Reaction Kinetics

 CHEMICAL KINETIC • The expressions of rate of reaction and types of rates; • Stoichiometric relationships between the rates of appearance or disappearance of components in a given reaction; • Determination of rate orders and rate law using the kinetic data of a reaction; • The graphical method to determine a first-order and second-order reaction….

What is the atomic radius?

What is the atomic radius?

Definition The atomic radius is defined as the distance from the centre of an atom to the outer edge. However, as atoms almost never exist as independent units, the measurement is taken as either the dispersion, or covalent radius, or the metallic radius. If the element is in the solid form and the atoms are…

The Periodic Table

The Periodic Table

The early periodic table John Newlands Dmitri Mendeleev ·      Ordered his table in order of atomic mass ·      Realised similar properties occurred every eighth element – ‘law of octaves’ but broke down after calcium. ·      Ordered his table in order of atomic mass, but not always strictly. ·      Left gaps for undiscovered elements. The table…

What is meant by hydrocarbons

What is meant by hydrocarbons

Hydrocarbons Hydrocarbons are compounds containing only hydrogen and carbon. There is a huge diversity in the number of compounds that can be formed from only carbon and hydrogen atoms. They may consist of straight chains, branched chains or ring structures; they may contain only single bonds, double bonds, triple bonds, or aromatic systems in which…

Naming Organic Compounds

Naming Organic Compounds

Systematic nomenclature There are millions of different organic molecules. To give every one of them a different name would involve a huge amount of learning, were no logical pattern to be adopted. The IUPAC developed the systematic naming system (nomenclature) to allow many of the organic compounds to be named in a logical fashion by…