Germanium

The Democratic Republic of the Congo is a land of resources that many have taken advantage of. Because of its remote location and foreign mining companies the people of the congo are very poor. The vast resources of the Democratic Republic of the Congo have major impacts on global societies all around the world. The Democratic Republic of Congo or simply called Congo is located in south central Africa between Tanzania and Gabon. The Congo is made up of a variety of different landscapes…

Cunningham over as “you can scrub Walter Cunningham till he shines, you can put him in shoes and a new suit, but he’ll never be like Jem” (Pg.300). This statement proves that even though Jem and Walter both live in Maycomb County, attend the same school and are boys, the way society percieves and treats them is completely different. While Jem is respected by society since he belongs to the upper class, is white and his family has a steady income. Walter is treated as an outcast since he is part…

Answer: Question 1 (a) Energy Energy Energy Band gap Band gap 0 0 0 (i) Insulator (ii) Semiconductor (iii) Conductor Diagram 1: The energy band The differences between insulator, semiconductor and conductor. Insulator Semiconductor Conductor It has a large band…

covalent bond are known as organometallic compounds many of these are thermodynamically unstable and are pyrophoric. The meta may belongs to main group, transition metal, f group metal or a metalloid i.e. selenium, boron, arsenic, silicon, antimony, germanium, and tellurium and the carbon moiety may be alkyl, alkene, alkyne, carbonyl, cyclic, heterocyclic or aromatic.1 Historical Background: In 1827, the discovery of Zeise’s salt, K[Pt(C2H4)Cl3], and in 1849 the preparation of metal alkyls by…

1. Insulator is a material that does not transmit heat, sound or electricity from one end to another. It hinders the free flow of electrons from atom to atom and molecule to molecule. This is because the electrons are tightly bond to the atoms leaving no space for there to be any free electrons to transmit electrical energy. Examples of insulators are glass, rubber, wood and paper. Conductor is an object or type of material that can transmit heat, sound, light or electricity. It does this by…

Rare earths are very significant when it comes to the development and use of technical equipment as they can be very important to the performance of the unit. An example of an everyday piece of technology that uses rare earths is the IPhone. Apple has said that the IPhone uses eight rare earths, from everything from the colored screen, to speakers, to the miniature circuits inside the phone. Although the amount of rare earths in the phone is very little, the demand for rare earths will continue…

The periodic table had been a key factor in many ways to finding new elements, like scandium, silicon, and neon. It has shown new ways those elements could help us by predicting certain elements reactions. While Dimitri Ivanovich Mendeleev is considered to be the creator of the periodic table, there were many contributions that helped the creation of the useful graph be achieved. Between 1817 and 1829 Johann Dobereiner was grouping elements with similar properties into groups of threes,…

Alyssa Eaves Professor David Bergbreiter CHEM 227 22 November 2014 Dmitri Mendeleev: A Biography Today in American classrooms, the name Dmitri Mendeleev conjures up the sole image of a periodic table, secure and immutable with all its ordered numbers and letters marching along in dependable patterns. More than one hundred years ago in Imperial Russia, the name Dmitri Mendeleev would call to mind séance scandals, economic tariffs, hot air balloon rides, a nationwide push for the metric system…

Thermoelectric characteristics of bulk and ultrathin Ge-on-insulator substrates fabricated by direct wafer-bonding 5.1 INTRODUCTION Thermoelectric materials have been attracted considerable attention due to their ability to capture waste heat and to convert to useful electrical energy. However, their conversion efficiency is not sufficient for a practical use. The theoretical power-generator efficiency increases monotonously with increasing the figure-of-merit Z of thermoelectric materials which…

vitamin D), antioxidants (e.g. vitamin E), and mediators of cell signaling and regulators of cell and tissue growth and differentiation (e.g. vitamin A). The largest number of vitamins (e.g. B complex vitamins) function as precursors for enzyme cofactor bio-molecules (coenzymes), that help act as catalysts and substrates in metabolism. When acting as part of a catalyst, vitamins are bound to enzymes and are called prosthetic groups. For example, biotin is part of enzymes involved in making…