adioisotopes: What Are They and How Are They Made?What are isotopes?The isotopes of an element are all the atoms that have in their nucleus the number of protons (atomic number) corresponding to the chemical behavior of that element. However‚ the isotopes of a single element vary in the number of neutrons in their nuclei. Since they still have the same number of protons‚ all these isotopes of an element have identical chemical behavior. But since they have different numbers of neutrons‚ these isotopes of the
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bases in existence‚ but the most useful one is the Bronsted-Lowry definition: An acid is a substance which can behave as a proton (re presented as a hydrogen ion‚ H+) donor. Any substance which contains hydrogen bonded to a more electronegative element can thus behave as an acid: HCl == H+ + Cl- H2SO4 == H+ + HSO4- A base is a substance which can behave as a proton acceptor. Any species which has a lone pair of electrons can thus behave as a base: NH3 + H+ == NH4+ OH- + H+ == H2O 2
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(9) Curphey‚ T.‚ Hung‚ C.Y. and Chu‚ C.C. J. Org. Chem.‚ 40(5)‚ 607-614 (1975). (10) Chiba‚ T.‚ Okimoto‚ M.‚ Nagai‚ H. and Takata‚ Y. J. Org. Chem.‚ 44(20)‚ 3519-3523 (1979). (11) Iglesias‚ E. J. Org. Chem.‚ 68(7)‚ 2680-2688 (2003). 3.3 cm (0.3×11 protons) of the 4.6 cm intergral height was assigned to the enol structure. Enol % = 3.3/4.6 × 100 = 71.7%‚ Keto % = (4.6-3.3)/4.6 × 100 = 28.3%. The enol structure was the major form of 2-acetylcyclohexanone‚ same as the Pavia et al [1] and Igiesias [11]
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Atom- smallest unit of matter that still retains the properties of an element. * Three types of subatomic particles: neutrons‚ protons‚ and electrons. * Electrons travel nearly at the speed of light‚ forming a cloud around the nucleus. * Dalton is a measurement used to measure subatomic particles. (same as atomic mass unit or amu) * Neutrons and protons weight about 1 Dalton. * Electrons weight so less that they do not contribute in
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Lesson 5/ Key Questions: 18. In the morning‚ when you wake up‚ before you eat‚ go for a walk ‚ swim‚ something for around 3-10 minutes. It will help get your metabolism started and work better through out the day. I would suggest cutting those 2 beers a night into one‚ or maybe 2 every other day‚ or 2 a week. I would eat something like oatmeal in the morning‚ or simple toast with eggs and HAM. Bacon is high in fat and calories. And always get fruit. And Change up your lunch. Make a sandwich. or
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center‚ called a nucleus. The nucleus contains positively charged particles called protons and uncharged particles called neutrons. The nucleus of an atom is surrounded by negatively charged particles called electrons. The negative charge of an electron is equal to the positive charge of a proton‚ and the number of electrons in an atom is usually equal to the number of protons. When the balancing force between protons and electrons is upset by an outside force‚ an atom may gain or lose an electron
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absorption bands. The 1H NMR spectra showed signals corresponding to the two methylene protons in addition to the aryl and NH proton of the 1‚2‚4-triazole ring.
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Enzymology‚ Catalytic Mechanism‚ Carbohydrate Metabolism‚ Adenosine Triphosphate Enzymes are proteins and their function is to act as catalysts to speed up certain chemical reactions in the cell that would be slower without them. This process occurs as steps in a cycle with separate reactions in each step. If there is a missing product the step in the cycle will be incomplete and the normal function of the organism cannot be accomplished causing negative effects on the organism. The biological
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CONFIDENTIAL BM/APR2011/MKT420 UNIVERSITI TEKNOLOGI MARA FINAL EXAMINATION COURSE COURSE CODE EXAMINATION TIME PRINCIPLES AND PRACTICE OF MARKETING MKT420 APRIL 2011 3 HOURS INSTRUCTIONS TO CANDIDATES 1. 2. 3. 4. This question paper consists of six (6) questions. Answer only four (4) questions in the Answer Booklet. Start each answer on a new page. Do not bring any material into the examination room unless permission is given by the invigilator. Please check to make sure that this
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the hydrogens shoot their components: one proton and one electron‚ into the main carrier protein of the membrane. The proton fully goes through while the electron gets stuck in the protein. Next‚ the electron acts like a “hot potato‚” and jumps from protein-to-protein. During this‚ the proton on the other side of the membrane follows the electron as it goes. The electron’s destination is the ATPASE‚ or an ATP synthesizer protein (makes ATP). Both the proton and the electron shoot down through the protein
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