CHEMISTRY UNIT 2 STRUCTURE OF ATOM The rich diversity of chemical behaviour of different elements can be traced to the differences in the internal structure of atoms of these elements. After studying this unit you will be able to • know about the discovery of electron‚ proton and neutron and their characteristics; • describe Thomson‚ Rutherford and Bohr atomic models; • understand the important features of the quantum mechanical model of atom; • understand nature
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Hailie Armstrong Ms. Gorges U4 L8 Chemistry 11/19/14 Modeling Molecules Introduction: You can represent a molecule two-dimensionally‚ as a structural formula or electron dot structure. Although such models are useful in certain contexts‚ they do not accurately represent bond angles between atoms or shapes of molecules. In this activity‚ you will construct three-dimensional models of several molecules. You will use electron dot structures and structural formulas to inform how you construct the
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Introduction An atom is the smallest part of an element that can take part in a chemical change. The word “atom” comes from the Greek “atomos”‚ which means “unable to be cut”. Atomism is the philosophy of the existence of atoms. The first theories of atoms come from India. There was a Hindu sage named Kanad that hypothesized that all mater was composed of earth‚ water‚ light‚ wind‚ ether‚ time‚ space‚ mind and soul. Then another philosopher named Pakuda Katyayana suggested that everything can be
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molecule of water A chemist’s view of the world is not as narrow as one might think! Yes‚ we start with the atom‚ and then go on to the rules governing the kinds of structural units that can be made from them. We are taught early on to predict the properties of bulk matter from these geometric arrangements. And then we come to H2O‚ and are shocked to find that many of these predictions are way off‚ and that water (and by implication‚ life itself) should not even exist on our planet! But we soon
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Biology‚ Biological Molecules Revision Notes Distinguish between monomers and polymers: Monomers- Identical small molecules. Polymers- Chainlike molecules formed from the linking together of many similar. Distinguish between monosaccharides‚ disaccharides‚ and polysaccharides: Monosaccharides- Simple sugars; sugar molecules may be enantiomers due due to the spatial arrangement of parts around asymmetric carbons; raw material for synthesis of other organic molecules. Disaccharides- Two
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****Atoms Think and Compare: Page 331 Q-3 Consider these atoms: hydrogen H‚ aluminum Al‚ argon‚ Ar. Rank them‚ from smallest to largest‚ in order of (a) size; (b) number of protons in the nucleus; (c) number of electrons. In order of size from smallest to largest: Hydrogen H‚ Argon Ar‚ Aluminum Al. In order of proton from smallest to largest: Hydrogen H‚ Aluminum Al‚ Argon Ar. In order of electron from smallest to largest: Hydrogen H‚ Aluminum Al‚ Argon Ar. Q-4 Consider these atoms: helium
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cell and between cytoplasm and the external environment. The cytoplasm and extracellular environment of the cell are aqueous solutions. They are composed of water‚ which is the solvent‚ or dissolving agent‚ and numerous organic and inorganic molecules‚ which are the solutes‚ or dissolved substances. Organelle membranes and the plasma membrane are selectively permeable‚ allowing water to freely pass through but regulating the movement of solutes. The cell actively moves some dissolved substances
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E:\CC_Software\Workbench\CC-MW-CD\part2\phasechange\page2.cml 1. Describe the motion of atoms and molecules in a gas. the atoms and molecules bounce off one another each time they come in contact with eachother. they never bond‚ but reflect off of eachother and spread around. 2. How are the behavior and arrangements of gas molecules similar to and different from soccer players running in the field? the molecules are similar to soccer players running on a field when they continually move and dont
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M-F (12-1) Bonding Atoms to Form Molecules 1) Observe a) Atoms bond together to form molecules b) Some molecules are inorganic (non-living). c) Some molecules are organic (are/were living)‚ containing all or part of Mr. Cohn. d) Atoms can bond ionically‚ whereby an atom gives up valence electrons and becomes a + ion‚ and another atom receives those electrons and becomes a – ion. The overall charge on the molecule then becomes zero. e) Atoms can bond covalently
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Atom History Essay An Atom is a basic unit of matter that consists of a dense‚ central nucleus surrounded by a cloud of negatively charged electrons. The Atom was theorized by a man named Democritus of Abdera‚ Thrace in between c.a 460 BC - ca. 370 B.C. Atom is derived from the Greek word “atomos” ‚ which means to be uncuttable. He had a theory that everything is composed of “atoms”‚ which he believed that these minuscule objects are indivisible‚ indestructible and have and always been in motion
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