CHE 140 Name__Chesi Spriggs First Hour Exam Potentially useful information 1000 g = 1 kg 1000 mL = 1 L 1 in = 2.54 cm 1 mL = 1 cm3 D = m/v Select the best choice for the following questions. ___e___ 1. A hypothesis is a(n) a. formulation of principles based on facts. b. modification of a theory. c. organized body of knowledge. d. tentative explanation of observations. e. None of the above. __b___ 2. The initial success of the Bohr theory was based
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table and vocab (65 points) Match the following items. (14 points) 1. emitted from a cathode ray tube Bohr 2. discovered the neutron Chadwick 3. discovered the electron JJ 4. postulated the quantum atom nucleus 5. discovered the proton electrons 6. father of atomic theory Dalton 7. location of most of the mass of the atom Bohr 1. unlike charges attract 2. like charges repel 3. charge on a neutron nonmetals 4. location of an electron periodicity
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Year 12 Physics 2014 ER – The Physics of Medicine Extended Response Task [Type the author name] This report will discuss how cerebrovascular disease‚ in particular ischemic stroke‚ can be diagnosed using magnetic resonance imaging scans. It will go through the different MRI sequences and the physics behind them. Evidence from two case studies are presented‚ which use the MRI sequences discussed within this report. Consequently‚ the recent advances in diagnostic techniques and methodologies will
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An ion is an atom or molecule in which the total number of electrons is not equal to the total number of protons‚ giving it a net positive or negative electrical charge. The name was given by physicist Michael Faraday for the substances that allow a current to pass ("go") between electrodes in a solution‚ when an electric field is applied. It is from Greek ιον‚ meaning "going." The word ion also is responsible for electrical current being symbolized by the letter i in chemistry and physics. An anion
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theory of spectra and atomic constitution‚ atomic theory and the description of nature. NEILS BOHR (1885-1962) His model of atom…. Bohar’s model of atom can be described as follows: An atom is made up of three particles-electrons‚ protons and neutrons. The protons and neutrons are located in a small nucleus at the centre of the atom. The electrons revolve rapidly round the nucleus in fixed circular paths called energy levels or shells. There is a limit to the number of electrons which each
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A cycle is a biological pathway or process in which the end product of one cycle becomes the starting point for the next cycles Write an essay about cycles. Respiration Cells in the body use ATP as a direct source of energy. The conversion of glucose into ATP takes place during respiration. There are 2 different types of respiration‚ the more common and frequent one is aerobic respiration which is the production of ATP for energy. The less common one is anaerobic respiration‚ the production
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but for easier reasons you can call me P. I am pretty much at the beginning of the periodic table‚ thanks to my atomic number of 15. Wonder what’s an atomic number? It is basically the number of protons‚ which is my positive charge‚ that I contain at my nucleus. The nucleus does not only contain protons‚ but also neutrons‚ which will be important to know of and will talk about it soon. I was discovered in 1669 by my closest human friend‚ Henning Brand. He is such a wonderful human
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acids – sour‚ turn blue litmus to red (pink)‚ conduct electricity - bases – bitter‚ soapy taste‚ slippery‚ conduct electricity‚ turn red litmus to blue Bronsted – Lowry Theory: - acids – donate proton‚ bases accept proton - ex: HCl donates proton to water ( not reversible ) - ex: water donates proton to ammonia – reversible - Amphoteric substances: ____________________________________________________________ - Advantage of B-L definition: - 1. reactions can be identified as acid-base neutralization
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IIn part A‚ the unknown 30 was identified as Histidine by using a thin layer chromatography. Among the four amino acid standards (Ala‚ Gly‚ His‚ and Ser)‚ the average Rf value of the unknown (0.31) was closest to that of standard Histidine (0.29) and its Rf percent error was lowest (6.9%). Furthermore‚ the color‚ shape‚ and size of the unknown clearly corresponded to that of Histidine standard. Overall‚ the experiment was successful in identifying the unknown amino acid‚ for the obtained Rf and
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IB Home Standard Level Higher Level Options Additional Resources 8.2 Photosynthesis 8.2.1 Draw and label a diagram showing the structure of a chloroplast as seen in an electron micrograph 2D Representation 3D Representation Electron Micrograph 8.2.2 State that photosynthesis consists of the light-dependent and light-independent reactions Photosynthesis is a two-step process: 1. The light dependent reactions convert the light energy into chemical energy 2. The light
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