the production of a local cell – small-scale corrosion that happens where two metals of different reactivity are in contact under humid conditions – which speeds up the exothermic reaction. Because the electron potential of magnesium is lower than that of iron (the less reactive metal)‚ electrons will pass from the magnesium to the iron‚ and only from there into the water. Although magnesium cations (Mg2+) and hydroxide anions (OH-) continue to be formed‚ they are separated by the iron and cannot
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Chapter II Light and Matter The Inner Workings of the Cosmos 2.4 The Distribution of Radiation All microscopic objects – fires‚ cubes‚ people‚ and stars – emit radiation at all times. They radiate because the microscopic charged particles in them are in constant random motion‚ and whenever charges change their state of motion‚ electromagnetic radiation is emitted. The temperature of an object is a direct measure of the amount of microscopic motion within it. The hotter the object
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hydrogen bonds. • Ionization energy- E is required to remove an e- • Electronegivity- desire for electrons highest closer the the right • Highest ionization energy is helium • Potassium bromine the element bromine forms an anion • Alkali metals +earth metals conduct electricity • Covalent bonds form when 2 elements with high electroneg share a pair of electrons • Covalent compounds- 2 elements with high electroneg bond • In nature there are pure elements and
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ignition system. A.) Permanent magnets‚ High tension coil‚ Mechanical or electronic switching device‚ Condenser‚ High tension spark plug wire‚ Spark plug 4.) Regarding atoms _______. A.) C 5.) The electron theory states that ________. A.) B 6.) Substances that have electrons that can move freely from atom to atom are said to be good ___________. A.) A 7.) List three good electrical current conductors. A.) Cooper‚ aluminum and silver 8.) List three good insulating
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Nervous System The nervous system is the part of an animal’s body that coordinates the voluntary and involuntary actions of the animal and transmits signals between different parts of its body. In most types of animals it consists of two main parts‚ the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS contains the brain and spinal cord. The PNS consists mainly of nerves‚ which are long fibers that connect the CNS to every other part of the body. The PNS includes motor
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It is used in PET scans. Decay mode: 9F18 ( 8O18 + +1e0 (1.656 MeV). Oxygen 18 is stable. The positron travels only a few millimetres in the human body before it meets an electron‚ when both are annihilated producing two gamma ray photons. The energy of each gamma ray photon is 511 MeV‚ the rest mass of the electron‚ so presumably the positron looses some energy prior to annihilation. The typical exposure from a PET scan is about 7 mSv. Production: Irradiation of the stable oxygen 18 isotope
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Modern theories For a long time‚ it was thought that the proton‚ neutron‚ and electron were the elementary particles‚ as well as the smallest. Since the Atomic Theory was formulated‚ many new particles have been discovered. The new theories concerning these particles and predicted particles attempts to explain every phenomena in physics. This is also called the Universal Theory of Matter. Dark Matter and Dark Energy Dark matter is an assumed kind of matter which unlike ordinary matter does
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Imler‚ & Michael Montone CHEM 353 Abstract: Introduction: Method I: Absorption Spectra of Conjugated Dyes This method analyzes a series of dyes with alternating double bonds. It is assumed that the π electrons are free to move and ignoring the electro static repulsion among the π electrons themselves. The theoretical model applied in this experiment is the particle in the box. The model states that a single particle moves free along a line but will remained constrained to its limits.
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The weak force keeps atoms together to make bigger stuff. Nearly everything in the physical universe is made up of just three fermions‚ two types of quark and an electron. Each type of quark carries a specific charge. Up quarks carry a positive two thirds charge (+2/3). Down quarks carry a negative one third charge (-1/3). Electrons carries a ‘whole’ negative charge (-1). Depending on how these three quarks are arranged‚ you can arrive at a particle with no charge (neutron) or a whole positive
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The number that goes along with the word Therac stands for the maximum amount of mega electron volts (MeV) the machine can dispense. It was believed that the new Therac-25 was much more efficient than Therac-6 and Therac-20. The overall size of the machine was reduced and still allowed for two modes; photon mode and electron mode. A tungsten shield was in place for the X-ray mode and removed for the electron mode Between June 1985 and January 1987‚ a computer controlled radiation therapy machine
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