Nanotechnology In my interview with Kevin Hennessey from the California Nanoscience Institute here at UCSB, he explained about the research of compound semi-conductors. His work is engrossed in Nanoelectronics which involves the exploitation of quantum behavior in nano-scale systems. Compound semi-conductors differ from the traditional silicone based devices and offer superiority. (Hennessey Interview) Development of compound semi-conductors requires the use of technologies on nano-level, one billionth of a meter. "Scientists and companies are envisioning dramatic advancements in the functionality and properties of materials, including improved strength and durability.
Column 17 is made up of the more reactive gases- the halogens. The noble gases are in column 18. The electrons are the most significant part of an atom. When atoms don’t have the sufficient number of electrons they need in their outer level, they will do whatever they can to get the number they need. The number of protons an atom has is its atomic number.
Task 3 (D4) Choose one primary and one secondary cell and evaluate their use for portable applications. Primary – (silver oxide cells) Zinc-silver oxide cells effectively use the high electrode potential of silver to produce a high energy density that is combined with a flat discharge curve. This is done as silver oxide forms a positive anode for the cell which could also be mixed with little amounts of manganese dioxide. The metallic zinc in the battery powers the negative electrode which is formed into a gel like substance with the electrolyte usually sodium hydroxide or potassium hydroxide. A separator membrane will then be infiltrated between the negative electrode gel and positive electrode preventing them from being mixed together which would make the battery useless if not in place.
Being soft is another helpful adaptation for lowering the melting point of raw materials in steel production. All rocks can do is sit there, weather, erode, and deposit. What fun is that? We fluorites have much more exciting lives. My siblings and I can even be used to make high-performance telescopes.
As a reverse DC voltage is applied across the diode, its capacitance varies. The higher the voltage, the less the capacitance. This is due to depletion layers of the diode junction, but we wont get into details here. This variable capacitor in conjunction with the stub, which is actually an inductor (coil) is the basis of our voltage controlled oscillator! As the voltage increases across D5, the frequency of oscillation increases.
Bakelite is a thermosetting resin - that is, once molded, it retains its shape even if heated or subjected to various solvents. Bakelite was also particularly suitable for the emerging electrical and automobile industries because of its extraordinarily high resistance - not only to electricity, but to heat and chemical action. It was soon used for all non conducting parts of radios and other electrical devices, such as bases and sockets for light bulbs and electron tubes, supports for any type of electrical components, automobile distributor caps, and other insulators. Along with its electrical uses, molded Bakelite found a place in almost every area of modern life. From novelty jewelry to iron handles to telephones to washing-machines impellers, Bakelite was seen everywhere and was a constant presence in the technological infrastructure.
Bonding Formal Lab Introduction (with Background information): Any substance, whether it is a metal or nonmetal, people can determine it by seeing if it is shiny, soft, or reactive. Metals are shiny, reactive, and have high melting points, while nonmetals are soft, have low melting points and not very reactive, and that is how anyone can determine whether a substance is a metal or a nonmetal. Covalent bonding is when two atoms share electrons, but it only occurs in two nonmetals only. They have low melting points and they are not soluble. Although, Ionic bonding is when an atom gives away elections to another atom, which only happens in a metal and a nonmetal, and they have high melting points and are soluble.
Applying The Law of Conservation of Mass to the Copper Cycle Clara Ramirez* Lab Partner: Manniah Harris Chemistry Lab 111 Section 529 Introduction: Copper is an abundant element found in nature as well as in a variety of different compounds. It is an excellent conductor of heat and electricity, hence it can be found in various industries. The purpose of the experiment was to demonstrate the copper cycle, in which copper metal would be transformed through a series of reactions and then recovered as solid copper. A percent yield for copper recovered was also calculated. The Law of Conservation of Mass will also be expressed during the experiment, as it states mass is neither gained nor lost in a chemical change.
Reactivity of Metals Background Information When a metal (such as magnesium, aluminium, zinc and copper) is mixed with hydrochloric acid, a hydrogen gas is produced. If hydrogen gas is produced, a pop sound should be heard when a flame is held over the substance. On the periodic table the most highly reactive elements are in the first group and the least reactive are in the last group. All metals have the same properties, they are shiny, they conduct heat and electricity, they are malleable which means able to change shape permanently without breaking or cracking, and they are also ductile which means they are able to be deformed without losing their strength. Aim To compare the reactivity of various metals by observing their reaction with hydrochloric acid Hypothesis That the all the metals will produce foam and a pop.
The element used in atomic bombs is Uranium-235. Uranium's atoms are unusually large, and henceforth, it is hard for them to hold together firmly. This makes Uranium-235 an exceptional candidate for nuclear fission. Uranium is a heavy metal and has many more neutrons than protons. This does not enhance their capacity to split, but it does have an important bearing on their capacity to facilitate an explosion.