• Bohr And The Periodic Table
    473 words
    Bohr's Model There are three main parts of an atom the electrons, protons and the neutrons. Each part has charge. It is rather positive, negative, or neutral. An electron always has a negative charge. Protons always have negative charges. Then finally the neutron is a neutral charge or a charge of zero. If the charge of the whole atom it zero that means there are an equal number of positive and negative pieces. An electron can be found anywhere around the nucleus, and the protons and neutrons a...
  • Charge Particles Mass Electrons
    299 words
    Mini-Research ELECTRON- In 1897, Sir J. J. Thomas, an English physicist, measured the deflection of cathode-ray particles in magnetic and electrical fields. As a result he found the ratio of the charge, e, to the mass, m, of the cathode-ray particles. He found e / m identical to those particles irrespective of the metal the electrodes were made of or the kind of gas in the tube. In 1909, RA Millikan, an American scientist, measured that charge. All electrons are found to be identical no matter ...
  • Atp Production Kreb S Cycle
    897 words
    ATP Production Metabolism, which encompasses glycolysis, the Kreb s cycle, and the electron transport system, occurs in the mitochondria of cells. The mitochondria consist of a double membrane and an inner compartmentalization called the matrix. Each of the processes of metabolism occurs in specific locations in and around the mitochondria. The process of glycolysis occurs in the cytoplasm just outside the outer membrane of the mitochondria. The Kreb s cycle occurs within the matrix and the elec...
  • Magnetic Field Angular Momentum Direction
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    Some materials have a feature known as ferromagnetism. The prefix 'ferro' refers to Iron, which is one such material. Ferromagnetic materials have the ability to 'remember' the magnetic fields they have been subjected to. An atom consists of a number of negatively charged electrons, orbiting around a positively charged nucleus. These electrons also possess a quantity known as spin, which is roughly analogous to a spinning top. The combination of orbital and spin motions is called the angular mom...
  • Electron Microscope Specimen Image Beam
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    The electron microscope, instrument that produced the first magnified image showing 'three-dimensional' and highly magnified image of a small object. It directs a beam of electrons rather than light through a specimen. The beam of electrons is created from an electron gun. This beam then travels through the length of the microscope cylinder, which contains the lenses, the specimen chamber, and the image-recording system. Two types of electron lenses are used, electrostatic and electromagnetic. T...
  • Type Semiconductor Electron Electrons Energy
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    Semiconductors have an electrical resistivity that is in between those of good conductors and those of good insulators. Both silicon and germanium, which are the two basic semiconductors, have four electrons in the outermost electron sub shell. In formation of the lattice structure of the silicon or germanium, all the valence electrons are involved in the bonding, so the material should be an insulator. However, an unusually small amount of energy is needed to break one of the bonds and set an e...
  • University Spin Electron Ohio
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    ATHENS, Ohio -- Today's computers and other technological gizmos operate on electronic charges, but researchers predict that a new generation of smaller, faster, more efficient devices could be developed based on another scientific concept -- electronic "spin." The problem, however, is that researchers have found it challenging to control or predict spin - which keeps practical applications out of reach. But physicists in Europe, California and at Ohio University now have found a way to manipula...
  • Organic Chemistry Covalent Bond
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    Homologous Series: An homologous series is a set of compounds whose components differ by a single repeating functional group. In the case of (straight chain) alkanes, CH 2. Their general formula is Ch 2 n+2. The chemical properties of the individual members of an homologous series are similar and they show a gradual change in physical properties. Hydrocarbons: Compounds containing only hydrogen and carbon. There are three types alkanes, alkenes and alkyne's. A saturated molecule contains single...
  • Charged Lepton Electron Magnetic Charge
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    The Discovery Of The Electron The electron was discovered in 1895 by J. J. Thomson in the form of cathode rays, and was the first elementary particle to be identified. The electron is the lightest known particle which possesses an electric charge. Its rest mass is Me approximately equal 9. 1 x 10 -28 g, about 1/1836 of the mass of the proton or neutron. The charge of the electron is -e = -4. 8 x 10^-10 esu elec trostaticunit). The sign of the electron's charge is negative by convention, and tha...
  • Electron Microscope Microscopes First Light
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    The word microscope comes from two Greek words, micro meaning small and scope meaning to see. Microscope are instruments used to enhance our vision to see things that are to small to see with the naked eye. The first forms of microscopes were lenses used by an English scientist named Roger Bacon who wrote about using them to magnify things. The first actual microscope was made and used by a Dutch naturalist named Anton van Leeuwenhoek that magnified about 200 times. In about 1674 he said that he...
  • Valence Electron 8710 Energy 8729
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    Chemistry Study Guide Oct 2 nd 1 hour Exam Chapter 9- Thermodynamics KE = 1/2 mv 2 w = F∆ xw = force x distance∙ A state function refers to a property of the system that depends only on its present state. ∙ Internal Energy = heat + work∆ E = q + w∙ Pressure = Force/Area = P = F/A∙ Work = - external pressure x change in volume = - P∆ VEnthalpyH = E + Pvp = ∆ E + P∆ V∆ H = qp∆ H = H products - H reactants Ideal Gas Law PV = nRT Ener...
  • Hydrogen Spectrum Electron Size Nucleus
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    That means, any electron of the size of 10-8 will reduce to 10-15 which is the size of nucleus as time goes with the loss of entire energy. But normally it doesn't occur. If that is the case, i. e. if electron looses its energy and diminishes in to the size of nucleus, then any object which is build by electron inn this world will start reducing. Say for example if this duster, starts reducing, then tomorrow we will see that it's having a microscopic size. This is not practical. This is true fo...
  • Atomic Structure Electron Particle Theory
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    You have already seen Rutherford Atomic model which was proposed by Ernest Rutherford in the year 1911 and I have told such facts about that model which was not reality encouraged. if it is seen in reality then among the atomic model Rutherford Atomic model was the 1 st atomic model which was scientifically (doubt) organized & which in facts (doubt) a lot of conclusions about the atom which was not available there prior in (doubt). In this atomic model Rutherford never came to know what the real...
  • Kreb S Cycle Reactions Light Carbon
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    PHOTOSYNTHESIS General Info Dean: "To make with light" Reactants (Ingredients) CO 2, H 2 O, Sunlight, chlorophyll Products Food (C 6 H 12 O 6 = glucose) and O 2 Overall Reaction Photosynthesis is actually a series of two reactions. Light reactions (require sunlight) chlorophyll uses sunlight to split water and form oxygen and chemical energy. Dark reactions (don t require light) use chemical energy from light reaction to convert carbon dioxide into glucose. Where does photosynthesis take place S...
  • Cellular Respiration Hydrogen Ions
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    Introduction Once the energy that was in sunlight is transformed into chemical energy, the organism has to now convert the chemical energy into a usable form. It may seem a bit odd for they " re still to be more steps. After all, when we eat a candy bar isn't the sugar in the candy bar "burnt" by the body to provide energy? Well the answer is yes and no. First of all when we burn something normally in the air we combine that substance with oxygen releasing energy from the substance. Indeed, an a...
  • Bohr's Theory Surface Tension
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    The renowned physicist and Nobel Prize recipient Niels Henrik David Bohr, is known primarily for his pioneering work in the field of atomic theory. Bohr was born on October 7, 1885 in Copenhagen, Denmark and grew up in an intellectual atmosphere, being that his father was an eminent physiologist. During his childhood, Bohr demonstrated a fondness for understanding how things worked, and often repaired any instrument he could find. He excelled in his studies and was accepted at the University of ...
  • Development Of Quantum Theory
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    Development of Quantum Theory - Historical Perspective Quantum theory, the modern physical theory concerned with the emission and absorption of energy by matter and with the motion of material particles, is one of the most important theories devised in the 20 th century. The theory is revolutionary as it replaces classical physics in the description of events at the microscopic level and now the theory provides the foundation for modern physics and chemistry. The person who formed the basis of t...
  • Discuss The Bcs Theory
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    web >. The BCS theory (after is proponents US physicists John Bardeen, Leon Cooper and John Schrieffer) explains superconductivity in terms of electron pairs and packets of sound waves related to lattice vibrations (called phonons)... At temperatures below the critical temperature for particular metals (or metal alloys), the movement of electrons is enhanced by lattice vibrations (phonons) which cause electric field effects resulting in electron pairing (by overcoming what would normally be stro...
  • Charged Particle Atom Particles Mass
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    It has been said that during the 20 th century, man harnessed the "power of the atom." We made atomic bombs and generated electricity by nuclear power. We even split the atom into smaller pieces called subatomic particles. But what exactly is an atom? What is it made of? What does it look like? The pursuit of the structure of the atom has married many areas of chemistry and physics in perhaps one of the greatest contributions of modern science! . The parts of the atom: . chemistry and electromag...
  • Niels Bohr October 21
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    October 21, 1998 Niels Bohr Niels Bohr was born in Copenhagen, he is the son of a physiology professor, and went to school at the University of Copenhagen, this is where he got his doctorate in 1911. Bohr won the Nobel piece prize for his theory of atomic structures. According to Microsoft Encarta His work drew on Rutherford? s nuclear model of the atom, in which the atom is seen as a compact nucleus surrounded by a swarm of much lighter electrons. He thought that electrons are arranged in defin...