atoms/molecules/ions as there are atoms in a 12g sample of carbon -12 12g of carbon-12 contains a constant number of atoms. This number is known as the Avogadro constant (L) and is equal to 6.02 x 1023. 1 mole of carbon-12 contains 6.02 x 1023 atoms. Therefore‚ 1 mole of any substance contains 6.02 x 1023 atoms/molecules/ions. For example‚ 1 mole of aluminium contains 6.02 x 1023 Al atoms 1 mole of ammonia contains 6.02 x 1023 NH3 molecules 1 mole of iron ions contains 6.02 x
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negative ions‚ that is‚ cations and anions‚ in solutions whose composition is unknown. This procedure is called QUALITATIVE ANALYSIS. The modern chemist frequently wishes to identify the constituents in a very small amount of substance‚ and so he depends heavily on instrumental methods of analysis. While the procedures you will use do not use fancy and expensive instruments‚ your methods are still very effective in determining the major components of systems containing common inorganic ions. Because
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Purpose: The purpose of this experiment is to observe the colours produced when the solutions of metal ions are heated to high temperatures‚ then to explain the results in terms of the energy levels of the metal ions. Lastly‚ to use the flame colours to identify a series of unknowns. Hypothesis: Substance being tested Predicted flame colour NaCl(s) Yellow NaCl Red-Orange NaNO3 Dark Orange LiNO3 Red Sr(NO3)2 Dark Red KNO3 Blue-Indigo Ba(NO3)2 Yellow-Green Cu(NO3)2 Green Ca(NO3)2
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chloride ion (Cl-) is an important anion found in solids and solutions. In this experiment‚ the amount of chloride ion in an unknown sample J (NaCl + KCl mixture) of water using the Mohr method is determined‚ which relies on the solubility differences of two anions and the titration endpoint of a precipitate. The net ionic reaction during the titration is as follows: Ag+ + Cl- → AgCl(s) The Ksp for AgCl is 1.8 x 10-10 and that for Ag2CrO4 is 1.2 x 10-12. Thus‚ as silver ions are slowly
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compound absorbs heat from the water molecules in order to dissolve into ions of ammonium and nitrate. This absorption of heat is what causes the ice pack to get cold. This is the opposite of an exothermic reaction‚ in which heat is released from the system rather than absorbed. The chemical reaction that takes place in cold packs is also a decomposition reaction‚ as the heat causes the ammonium nitrate molecule to decompose into ions‚ thus making ammonium nitrate soluble in water (Tro‚ 2009). Ultimately
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Senior Secondary School and Junior College Mandaveli Chennai – 600028 A CHEMISTRY PROJECT “STUDY OF THE OXALATE ION CONTENT IN GUAVA FRUIT” Submitted in the partial Fulfilment of the requirement for AISSCE 2010-2011 By Abdud Dayan Adeeb Of Class XII C St. John’s Senior Secondary School and Junior College Mandaveli Chennai – 600028 A CHEMISTRY PROJECT “STUDY OF THE OXALATE ION CONTENT IN GUAVA FRUIT” Submitted in the partial Fulfilment of the requirement for AISSCE 2010-2011 By Jagadeesh
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4/02/2013 Abstract A sample of soil was tested for possible contaminants and other information using a variety of techniques including moisture analysis‚ pH measurement‚ acid-base titration‚ chloride-ion electrode analysis‚ and flame testing. The sample had a greater concentration of chloride ions‚ no measurable CaCo3 ‚ and lower than standard moisture content. It was contaminated with KCl and likely HCl ionic solids. Introduction Soil is a vital component of any environmental network. It provides
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Bis(acetylacetonato) copper(II) is a complex ion with copper ion in the centre surrounded by other molecules or ions weakly or more strongly bonded to it. The surrounded ions or molecules are called ligands. Ligands acts as Lewis base. It is attached to the centre metal ions by providing lone bond pairs to it. The active metal acts as Lewis acid‚ accepting electron lone pairs from ligands. The bonding which attach ligands and the centre metal ion together is coordinate bond or dative bonds. It
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Abstract In this experiment‚ the Ksp for calcium sulfate dihydrate‚ CaSO4·2H2O‚ by titrating 4 times a calcium sulfate dihydrate solution with diprotic EDTA‚ H2(EDTA)2-. For each trial we found the Ksp by means of molarities and activities. The results for the Ksp using only molarities was very different than the Ksp using activities. The average Ksp using molarity only was 2.26 x 10-4 and the average Ksp using activity turned out to be 2.31 x 10-5. The actual Ksp however‚ is 3.14 x 10-5. A percent
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5Name: ______________________________________ Date: ________________________ Student Exploration: Ionic Bonds Vocabulary: chemical family‚ electron affinity‚ ion‚ ionic bond‚ metal‚ nonmetal‚ octet rule‚ shell‚ valence electron Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. Nate and Clara are drawing pictures with markers. There are 8 markers in a set. Nate has 9 markers and Clara has 7. What can Nate and Clara do so that each of them has a full set? ____
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