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: Alison Bowler
Nitrogen makes up 78.1% of Earth’s atmosphere. Daniel Rutherford discovered this colorless, odorless and tasteless gas in 1772. After removing both oxygen and carbon dioxide from air, Rutherford found the remaining gas supported neither life nor fire. Its name comes from the Greek...
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By: Alison Bowler
Man has known of the yellow non-metallic element sulfur since antiquity. Found in its native state around volcanic vents one of its early uses was as an insecticide. The Greek poet Homer mentioned the insecticidal properties of sulfur in his writings 2800 years ago. The...
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By: Ussama Qadri
How a mass spectrometer works Mass spectrometer works on the technique of mass spectrometry in which basic composition of an element or molecule could be calculated. In order to understand the basic working principle of a mass spectrometer we need to understand the process an...
By: Alison Bowler
Copper (symbol Cu), known for thousands of years, about 5,000 ago led man out of the Stone Age and into the Bronze Age. When combined with up to 25% tin copper forms the alloy bronze. Another early copper containing alloy, made at least 2...
Element facts: Silver
By: Glen Brizius
Whether it's as coins, as carriers of electricity, or a component in photographic film, silver has many uses. Silver, copper, and gold (elements in Group IB of the Periodic Table of the Elements) are all used to mint coins. They have been used this way...
Element facts: Iron
By: Henry Chew
Iron, or its scientific name Ferum is a kind of metal. It has a density of 7.874 gram per cubic meter. Its melting point is at 1538 degree Celcius and boiling point, 2862 degree Celcius. Pure iron has a lustrous surface and is silvery...
By: Alison Bowler
The Swedish chemist Johan Gottlieb Gahn discovered the hard but brittle metallic element manganese (symbol Mn) in 1774. However, another Swedish chemist, Carl Wilhelm Scheele, proposed the existence of such an element prior to its discovery. Gahn isolated the element from the mineral pyrolusite. Pyrolusite...
By: Alison Bowler
Going into a chemistry laboratory just about anywhere in the world will reveal a brightly colored poster of the periodic table on the wall. Most chemistry textbooks and just about every chemistry website have a copy of this table. It has a long column of...
By: Janet Grischy
He was a genius among middle school biology teachers, and also a ham. He didn’t just take joy in science, he took glee. He loved shoving cages of frogs up next to each other so that they’d display for us. He made a...
By: Ernest Capraro
Volume and mass are two concepts that are at the core of measuring amounts, both in science and in life at large. In simple terms, volume measures the amount of space occupied by an object or material, while mass measures the amount of matter that...
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