Molecular Formula GaAs Molecular Weight 144.64 g/mol Crystal Structure Cubic Color Metallic dark gray Odor Garlicky when moist Melting Point 1238 °C Solubility <1 mg/mL at 20 °C Density 5.3176 at 25 °C Table 1. Properties of Gallium arsenide. Structure Gallium arsenide (GaAs) consists of larger arsenic atoms (violet) connected to somewhat smaller gallium atomsContinue reading “Gallium arsenide”
Category Archives: Chemical of the Day
The Magic Liquid Called Water
Water is ubiquitous – and while many of those with proper access to clean water take it for granted, its presence has driven the development of both life and society.
Helium hydride
Chemical Formula HeH+ Molar Mass 5.01054 g/mol Table 1. Properties of Helium Hydride Synthesis In the laboratory, helium hydride is produced by bombarding a low pressure hydrogen-helium mixture with electrons. Although helium hydride has been detected in space, not much is known about its natural formation. Structure The structure is quite simple, since it isContinue reading “Helium hydride”
Bacteriochlorophyll a
Molecular Formula C55H74MgN4O6 Molecular Weight 911.5 g/mol Color Light green Table 1. Properties Structure The “head” portion (encircled in red) of the bacteriochlorophyll consists of a partially hydrogenated porphyrin ring known as chlorin. It contains a central magnesium atom. Meanwhile, the “tail” portion (encircled in blue) is a hydrocarbon chain, connecting to the head byContinue reading “Bacteriochlorophyll a”
Protoporphyrin IX
Molecular Formula C34H34N4O4 Molecular Weight 310.4 g/mol Solubility 169 mg/L Table 1. Properties Structure Protoporphyrin IX falls under a special type of cyclic compounds: they are macrocycles, or molecules that have a ring of twelve or more atoms. The main bulk of the molecule is called a porphine core, encircled in red in Fig. 1. Continue reading “Protoporphyrin IX”
Hydrogen
Atomic Number 1 Atomic Weight 1.00794 amu Melting Point 13.81 K Boiling Point 20.28 K Phase at Room Temperature Gas Period Number 1 Group Number 1 Table 1. Properties History The term “hydrogen” is derived from the Greek words hydro and genes, together meaning “water forming”. The first to name it in its molecular gasContinue reading “Hydrogen”
Figure 73 