Introduction to the Lanthanides r understand that lanthanides differ in their properties from the s- and d-block metals; r recall characteristic properties of these elements; r appreciate reasons for their positioning in the Periodic Table; r understand how the size of the lanthanide ions affects certain properties and how this can r understand how to obtain pure samples of individual Ln3+ ions. 1.1 Introduction Lanthanide chemistry started in Scandinavia. In 1794 Johann Gadolin succeeded in
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CSEC CHEMISTRY NOTES ON SOLUBILITY OF COMPOUNDS IN WATER and SATURATED SOLUTION Reference: Chemistry‚ a Concise Revision Course for CXC by Anne Tindale From Chemistry for CSEC by Tania Chung-Harris and Mike Taylor Factors that influence solubility Temperature * The solubility of solids in liquids generally increases as temperature increases. * The solubility of gases in liquids generally decreases as temperature increases. (gases are less soluble in warm water than in cold water)
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. INTRODUCTION Learning Objectives 1. Define Psychology. 2. Describe the difference between opinions‚ values and facts‚ and explain how the scientific method is used to provide evidence for facts. 1. Define psychology. Psychology is the scientific study of the mind (mental processes) and behavior. 2. Describe the major schools of thought and theoretical perspectives in psychology. behaviorism psychology based on the premise that it is not possible to objectively study the mind‚ therefore
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Molar Mass by Freezing Point Depression November 28‚ 2012 NAME Lab partner- Purpose: To determine the molar mass of an unknown substance by measuring the freezing point depression of a solution of an unknown substance and BHT. Equipment: Test tube‚ 18*150 millimeters Wire stirrer Weighing dish Timer‚ seconds Chemicals: 2‚ 6-Di-tert-butyl-4-methylphenol‚ BHT‚ 16 grams Cetyl alcohol‚ CH3(CH2)14CH2OH‚ 1 gram Unknown substance
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The Solubility of Potassium Nitrate Aim: The aim of this experiment is to find out by how much the solubility of potassium nitrate into distilled water increases when the solution is heated‚ and if yes‚ by how much. Hypothesis: According to data on the internet‚ 3.75 × 10¹ moles of potassium nitrate dissolve in 100g of water. I believe this information may be correct. I also believe that as the solute is absorbing outside heat‚ the energy is increased causing it to dissolve both faster‚ with
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Abstract: The objective of the experiment was to verify the molar volume of a gas and gas constant.¹ The method in which was used to determine the volume of H2 gas at standard temperature and pressure and the gas constant was to measure a strip of magnesium and place it inside the gas buret which contained hydrochloric acid‚ blue dye and distilled water and allow the reaction to occur. Once the reaction was complete and there were no visible gas bubbles‚ the volume was obtained and recorded.
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General Chemistry II Lab (CHEM 1106) Determination of the Solubility Product Constant of a Salt Date Performed: March 1‚ 2011 INTRODUCTION If solid KHC4H4O6 is added to a beaker of water‚ the salt will begin to dissolve. The amount of solid diminishes‚ and the concentrations of K+(aq) and HC4H4O6-(aq) in the solution increase. When no KHC4H4O6 dissolves‚ the concentrations of K+(aq) and HC4H4O6-(aq) will not increase further and any additional KHC4H4O6 added after this point will remain
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Avogadro’s Number and Molar Mass Handout Key 1. What is the coefficient for oxygen when the following equation is balanced using the lowest‚ whole numbered coefficients? ____ C3H8O(g) + ____ O2 (g) ____ CO2 (g) + ____ H2O(g) a) 3 b) 5 c) 7 d) 9 2. What is the sum of the coefficients when the following equation is balanced using the lowest‚ whole numbered coefficients? _____ PH3 (g) + _____ O2 (g) _____ P4O10 (s) + _____ H2O(g) a) 10 b) 12 c) 19 d) 22 3. What is the sum of the coefficients when
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Experiment 10: Solubility Product for Calcium Hydroxide GOAL AND OVERVIEW A saturated solution of Ca(OH)2 will be made by reacting calcium metal with water‚ then filtering off the solids: Ca(s) + H2O → Ca(OH)2(s) Ca2+(aq) + 2OH-(aq) The concentration of dissolved hydroxide will be determined by acid-base titration with standardized HCl solution. The Ksp for Ca(OH)2 will be calculated from the experimentally determined saturation concentration of hydroxide. Objectives of the data analysis understand
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Lab – Solubility Curve for Potassium Nitrate I. Purpose: To plot a solubility curve for potassium nitrate in aqueous solution. II. Safety: Wear eye protection throughout the experiment. Be cautious of hot water. Wash hands if you come into contact with potassium nitrate. III. Procedure: 1. Carefully weigh out your assigned mass of potassium nitrate on a piece of weigh paper. Carefully pour the sample into the large test tube. 2. Add 20. mL of distilled water to the tube.
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