Tag - Chemistry education

A Level Chemistry Revision: Inorganic Chemistry – Group 7(17), The Halogens

The halogens are the six nonmetallic, highly reactive elements under Group VIIa (column 17) of the periodic table. They’re very strong oxidising agents, which means they take electrons from other substances. They’re also very reactive and usually form salts with Group 1a, i.e. the alkali metals. The name halogen literally means salt-producing. Halogens in elemental form do not exist...

A Level Chemistry Revision: Inorganic Chemistry – Group 2, The Alkaline Earth Metals

Alkaline earth metals, which are under Group 2 (the second column) of the periodic table, are highly reactive metals, though they’re not as reactive as the alkali metals. Their high reactivity is the main reason they aren’t found in a pure or elemental form in nature. Structurally speaking, these metals have two valence electrons in their outermost energy level. Source Many...

How To Carry Out a Titration Experiment

A titration experiment is the gradual adding of a known concentration of a reagent, called a titrant, to an unknown concentration of an analyte (the substance being analysed) until an endpoint is reached. Titration is one of the classic experiments in chemistry, and it’s done by most students at school.  Usually, chemical indicators that change colour are used to determine...

A Level Chemistry Revision: Inorganic Chemistry – Periodicity

Many elements were discovered long before the periodicity of elements was established by Dmitri Mendeleev in 1869. Mendeleev arranged the then-known elements in tabular form and discerned a pattern. With this, he was able to predict the existence of elements that had not yet been discovered. Since ancient times, philosophers have speculated about the fundamental compositions of all substances that...