at classifying elements into groups was done by Johann Döbereiner. In the early 19th century, Johann Döbereiner observed a little pattern in atomic weights and element’s properties and would put elements in groups of three elements, naming them triads. The three examples Döbereiner used was groups of “chlorine, bromine, and iodine, “calcium, strontium, and barium,” and “sulphur, selenium, and tellurium.” The middle element would have a halfway atomic number of the two other elements. Unfortunately
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(OH) is bound to a carbon atom alkene - Any of the series of unsaturated hydrocarbons containing a double bond and having the general formula CnH2n alkyl group: any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons. alkyne : Any of the series of unsaturated hydrocarbons containing a triple bond and having the general formula CnH2n-2 amine - An organic compound derived from ammonia by replacement of one or more hydrogen atoms by organic radicals.
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1. The different levels of organization are listed as follows: Cell- the structural and functional unit of all living things Tissue – a group of cells with a common structure and function Organ – composed of tissues functioning together for a specific task Organ System – composed of several organs working together Organism – an individual; complex individuals contain organ systems. Population – organisms of the same species in a particular area. 2. 7 basic characteristics of life are
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Chemical Equation? In chemistry, we use symbols to represent the various chemicals. Success in chemistry depends upon developing a strong familiarity with these basic symbols. For example, the symbol "C"represents an atom of carbon, and "H" represents an atom of hydrogen. To represent a molecule of table salt, sodium chloride, we would use the notation "NaCl", where "Na" represents sodium and "Cl" represents chlorine. We call chlorine "chloride" in this case because of its connection to sodium. You should
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A) ecosystem, population, organ system, cell, community, molecule, organ, organism, tissue B) cell, molecule, organ system, organ, population, tissue, organism, ecosystem, community C) organism, organ system, tissue, population, organ, community, cell, ecosystem, molecule D) molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem E) ecosystem, molecule, cell, tissue, organism, organ system, organ, community Answer:
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supplemental reading of these topics in any good General Chemistry text is expected. Dawn Fox Medeba Uzzi 2 SECTION 1 – Modules A – D: section deals with the foundation for chemistry. It introduces students to matter & its classification, Atom & its structure, Periodic table and chemical rxns. Introduction to Science and Measurement What is Chemistry? – Chemistry is the study of matter and its transformations Natural sciences refer to the systematic study of the natural world (our earth
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Understand covalent bonding displayed by elements in biological systems - Apply the octet rule - Practice converting molecular formulas into molecular structures - Be able to visualize and draw three dimensional molecular shapes Introduction: The octet rule states that most elements will share or exchange valence electrons in order to achieve a similar electron arrangement to the nearest noble gas. This concept is extremely important because it explains why elements bond to form compounds such as
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conversion of molecules to their component atoms in gaseous state ; and it is carried out by introduction of the molecules solution in the flame in very fine droplet Atoms in gaseous state in the flame absorb thermal energy from the flame itself ,some of the atoms get excited & as they return back to the ground state they emit radiation having energy equal to that absorbed. The emission is proportional to the number of excited atoms, which is proportional to the total number of atoms in the flame
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holds atoms together and makes them function as a unit Atoms bond to achieve a noble gas electron configuration (8 electrons in the outer level - octet rule) • • H and He are notable exceptions - only need 2 electrons (duet rule) The valence electrons (electrons in the outermost energy level) are the ones involved • Ionic Bonds • The electrostatic attraction between oppositely charged ions (cation = +; anion = -) Results from the transfer of e- from a low electronegative atom (cation
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particles literally fly apart 3. The difference between pure substances and mixtures: * pure substance: contains only one type of particle * element: a pure substance that can not be broken down into a simpler chemical substance by any physical or chemical means * compound: a pure substance composed of 2 or more different elements that are chemically joined * mixture: contains 2 or more types of particles * mechanical mixture: a mixture in which you can distinguish between
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