Chemistry

Every moment of every day, chemistry plays a part in all we experience. This branch of the Helium network humbly attempts to illuminate the vast array of chemical knowledge, making it accessible to all. Let our site inform, inspire, and awe you with chemical wonders.
By: Ernest Capraro
There are different definitions of acids and bases, each useful in their own contexts.An early one is that of Arrhenius, who defined acids as molecules with a hydrogen "an H" and bases as molecules with a hydroxide "an OH". This definition works very well...
By: Alison Bowler
Halogen is the name given to an element belonging to Group 17 of the periodic table. Older textbooks in the USA may refer to this Group as VIIA, while European texts may use VIIB. Group 17 is the terminology used by the International Union for...
By: Raven Lebeau
A candle consists of wax, which is a hydrocarbon, just like gasoline, and a wick, made from a combustible fiber such as cotton. This simple, two-component system makes it possible to have a controlled combustion that proceeds just rapidly enough to produce a small amount...
The ideal gas law
By: TheBlogger
The ideal gas law is on of the easier concepts of chemistry to understand and which can be applied directly to student's lives, and this is why many students get interested in ideal gas law rather than stoichiometry of solid elements. The law is introduced...
Chemistry basics: Understanding mixtures and solutions
By: Ernest Capraro
Rather than trying to define a mixture, it might be easier to define what a mixture is not. A mixture is not a pure substance. A pure substance, in chemical terms, is something with only one chemical present. That chemical might be either an element...
Properties of water
By: Chu Chin Kwok
Water, that most essential of chemical substances on our planet, is a wonderful gift of nature that most living things cannot live without, especially us human beings. Water, in the form of oceans and lakes and other 'bodies of water' constitutes almost three-quarters of the...
Converting Fahrenheit to Celsius
By: Beverley Francis
HOW TO CONVERT FAHRENHEIT TO CELSIUS AND OTHER CLOSE ENOUGH METHODS OF CONVERSION Two systems for measuring temperature are-Fahrenheit and Celsius. Fahrenheit is used in the Imperial system and Celsius(used to be known as Centigrade) is used in the Metric system. The United States, Jamaica...
What are formal charges?
By: Ernest Capraro
Formal charge can be calculated for any atom in a given Lewis Dot Structure. The sum of all formal charges in a structure must equal the total charge of the structure. Formal charges are a bookkeeping tool, used to evaluate Lewis Dot Structures. Formal charges...
By: Alison Bowler
Iodine Symbol: I Atomic Number: 53 Atomic Mass: 126.90447 amu (atomic mass units) Melting Point: 113.5 C (386.65 K, 236.3 F) Boiling Point: 184.0 C (457.15 K, 363.2 F) Number of Protons: 53 Number of Electrons: 53 Number...
By: Alison Bowler
Chlorine Symbol: Cl Atomic Number: 17 Atomic Mass: 35.4527 amu (atomic mass units) Melting Point: minus 100.98 C (172.17 K, minus 149.764 F) Boiling Point: minus 34.6 C (238.55 K, minus 30.279997 F) Number of Protons: 17 Number...

 

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