ISBN 061549218 ©2011 Copyright Theonosis Publishing LLC The text of this work is dual-licensed under the Open Setting License 1.0 and the Creative Commons Attribute-ShareAlike 3.0 Unported License. For more information see http://creativecommons.org/licenses/by-sa/3.0/ and http://theonosis.com/wiki/index. php?title=Theonosis:Open_Setting_License. The front and back cover are ©2011 Jeremy Thevonot and are dual-licensed under the Open Setting License 1.0 and the Creative Commons Attribute-ShareAlike
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Platonic Solids Essay I think that there are exactly five regular polyhedra‚ and I intend to prove why there are exactly five polyhedra. Ok‚ firstly‚ we need to identify what the five polyhedra are. They are the tetrahedron‚ the cube‚ the octahedron‚ the icosahedron‚ and the dodecahedron. All of these are regular polyhedra have something in common. For each shape‚ each of its faces are the same regular polygon‚ and the same number of faces meet at a vertex. This is the rule for forming regular polyhedra
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Measure about 1g of solid copper. 2.Place Cu in Erlenmeyer flask and place flask under fume hood. 3.Add dropwise 15M HNO3 until solid copper is completely reacted. 4.Place flask in water bath. 5.Add 4M NaOH slowly until no more solid forms. 6.Mix contents by slowly swirling flask. 7.Place flask back in water bath‚ heat to boiling‚ and stir. 8.Heat until separation of solid and solution. 9.Cool flask and allow contents to settle. 10.Decant liquid from solid. 11.Wash solid with water and decant
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differences in bulk properties. Solid is the state in which matter maintains a fixed volume and shape; liquid is the state in which matter maintains a fixed volume but adapts to the shape of its container; and gas is the state in which matter expands to occupy whatever volume is available. This diagram shows the nomenclature for the different phase transitions. More recently‚ distinctions between states have been based on differences in molecular interrelationships. Solid is the state in which intermolecular
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are: solid‚ liquid and gas. In addition‚ all matter is made up of particles: atoms‚ molecules and ions. Solids In the solid state state‚ the particles are packed closely together in a regular manner. The focus of attraction between these particles are very strong and as a result solids are usually very hard and very difficult to compress. Futhermore‚ the solids cannot move out of position‚ causing solids to have a fixed volume and a definite shape. In addition‚ the particles in a solid have a
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volume‚ mass‚ density‚ and specific gravity of solids and liquids with accuracy. Equipment: Students use the electronic balance to measure the mass of metals‚ pipettes‚ and pipettes holding liquids. The user presses the tare button to set the scale back to 0 g‚ and then places the metal or pipette onto the balance. The result is rounded to two decimal places. The graduated cylinder is used for measuring volume of a liquid or water displaced by a solid. The students look at lines‚ at eye level‚
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The samples were categorized as liquids and solids. Under the liquid samples were the subcategories of water and liquids other than water. Subcategories for solid samples were regularly-shaped and irregularly-shaped. All in all there were seven samples‚ namely water‚ isopropyl alcohol‚ coconut oil‚ wooden block‚ marble‚ pebbles‚ and an unknown liquid sample. For the density of water‚ a clean and dry 100ml graduated cylinder was weighed and 50ml of water was added into the graduated cylinder. The
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It exists in solids‚ liquids‚ gases‚ and plasmas. You can determine whether an object is a solid or not based on two characteristics. Solids have a definite shape and a definite volume. Solid’s particles are so close together that they cant move and that’s what keeps a solid a definite shape. Little motion can occur in the particle arrangement. Particles in liquids‚ however‚ can move more freely. The particles are close together but are not as tightly packed as solids are. Like solids‚ liquids have
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SUBLIMATION Sublimation is a technique used by chemists to purify compounds. Typically a solid is placed in a vessel which is then heated under vacuum. Under this reduced pressure the solid volatilizes and condenses as a purified compound on a cooled surface‚ leaving the non-volatile impurities behind. This cooled surface often takes the form of a "cold finger" (shown in the diagram above). Once heating ceases and the vacuum is released‚ the sublimed compound can be collected from the cooled surface
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Guess Paper – 2009 Class – XII Subject –Chemistry : Solid State (Q.1) The appearance of colour in solid alkali metal halides is generally due to: ( 1 mark ) (a) Frenkel defect(b) Interstitial positions(c) F-centres(d) Schottky effect (Q.2) Schottky defects in crystal is observed when ( 1 mark ) (a) unequal number of cations and anions aremissing from the lattice(b) equal number of cations and anions are missing from the lattice(c) an ion leaves its normal siteand occupies an interstitial
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