1. a) Democritus reasoned that if matter could be infinitely divided‚ it was also subject to complete disintegration from which it can never be put back together. However‚ matter can be reintegrated. b) In Greek‚ the prefix "a" means "not" and the word "tomos" means cut. Our word atom therefore comes from atomos‚ a Greek word meaning uncuttable. All matter is composed of atoms‚ which are bits of matter too small to be seen. These atoms CANNOT be further split into smaller portions. 2. At
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An electric charge is a fundamental quantity that is responsible for all electrical phenomena. An electric charge can have any value. A body has a negative electric charge whenever it has an excess of electrons. Electric charges can neither be created nor destroyed. 1 2. If the two electrons of a helium atom were removed‚ what would be its charge? a. b. c. d. 1.6 × 1019 C 3.2 × 10 C − 1.6 × 1019 C −19 − 3.2 × 10 −19 C 3. Three equally-charged bodies were hung and the interaction
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movement of electrons in atoms. Electrons exist in constant orbit around an atom’s nucleus in different levels of energy‚ also known as orbitals. When an electron makes the transition – drops - to a lower orbital‚ it needs to release some energy – which it does in the form of a photon. The energy level of this photon corresponds to how far the electron dropped between orbitals. So when a photon collides with another atom‚ the energy in the photon sometimes gets absorbed and boosts an electron in that
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The polymerase chain reaction (PCR) is a biochemical technology in molecular biology used to amplify a single copy or a few copies of a piece of DNA across several orders of magnitude‚ generating thousands to millions of copies of a particular DNA sequence. Developed in 1983 by Kary Mullis‚[1][2] PCR is now a common and often indispensable technique used in medical and biological research labs for a variety of applications.[3][4] These include DNA cloning for sequencing‚ DNA-based phylogeny‚ or
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CHEM 208 Module 2: List the steps of the scientific method: Scientific Method: performing a study in organized step: (led to enunciation of Law of Conversation of Mass and Matter) 1. Performing experiments: a. An experiment is a set of steps (procedures) that are performed under controlled
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3P91 X-ray fluorescence Electron Diffraction Professor: Dr. F. Razavi Lab Demonstrator: J. Korobanik Lab Partner: Adam Kober Author : Jasper D’Agostino SN : 4656534 Contents 1 Introduction 1.1 X-ray fluorescence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Electron diffraction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Discussion 2.1 X-ray fluorescence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 Electron diffraction . . . . . .
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4/5/’013 | | BOHR THEORY Introduction Niels Bohr applies quantum theory Rutherford’s Atomic Structure by assuming that electrons travel in stationary orbits defined by their angular momentum. This led to the calculation of possible energy levels for these orbits and the postulation that the emission of light occurs when an electron moves into a lower energy orbit. Atomic Spectrum The Atomic Spectrum is a series
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the number of protons and neutrons a.b. The sum of the number of protons‚ neutrons‚ and electrons. a.c. The sum of the number of the neutrons and electrons. a.d. The sum of the number of the electrons and protons. 6) (3 points) Determine the number of protons‚ neutrons‚ and electrons in: C 7) (3 points)Determine the number of protons‚ neutrons‚ and electrons in: 8) (3 points) Write the name and the symbol of the element with the
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electrolyte‚ an anode and a cathode partitioned by a proton exchange membrane as shown in figure1 (Du‚ Li and Gu 2007). At the anode‚ microbial respiration oxidizes available substrates to carbon dioxide results in liberation of electrons and protons. These electrons are transported out of the cell to the electrolytes via electrochemically active carriers‚ also known as
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Current ‚ Voltage‚ and Resistance [pic] A. The Electrical Nature of Matter All atoms are made up of protons‚ neutrons‚ and electrons. The classical model of the atom consists of a positively charged nucleus made up of protons and neutrons‚ and a number of negatively charged electrons in orbit about the nucleus. The simplest form of the model pictures electrons as tiny particles which circle the nucleus in definite orbits similar to the orbits of the planets about the sun. Though this model
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