Chem 17 ▪ General Chemistry Laboratory II Experiment 1 Calorimetry INTRODUCTION Chemical reactions are usually accompanied by the evolution (exothermic reaction) or absorption (endothermic reaction) of heat energy. When measured at constant pressure‚ the heat evolved (qp < 0) or absorbed (qp > 0) is equal to the enthalpy change‚ symbolized by ΔH. ΔH is positive for an endothermic process and negative for an exothermic one. If H f is the enthalpy of the final state and Hi of the initial state
Premium Chemical reaction Thermodynamics Enthalpy
could predict a reaction. MgSO4 with zinc No reaction observed Zn (NO3)2 with lead and aluminum No reaction observed FeCl3 with lead and aluminum reacts with foil‚ the piece dissolves in the solution and the lead piece seems to be oxidizing. CuSO4 with iron the screw seems to be oxidized quickly; it changes the color of it to a pinkish tone. Questions A. Based on your observations make an activity series of the metals used. List them in such a way that the most active metal is on the left
Premium Iron Hydrogen Zinc
Ashley Silva Lab 7: Three Stooges in Chemical Reactions Objective: The purpose of this lab is to experimentally determine the equilibrium constant‚ Kc ‚ for the following chemical reaction: Fe3+ (aq) + SCN-(aq) ↔FeSCN2+(aq) Background Information: A system is at equilibrium when the rate of the forward reaction is the same as the rate of the reverse reaction. There is no change in concentration for the reactants or products at chemical equilibrium. When the system is disturbed there
Premium Chemical reaction Chemical equilibrium Chemistry
filled with water up to approximately 2cm below the lateral connecting tubes. Measure the weight of the copper strips. These strips will serve as the cathode and anode of the coulometer. Immersed the strips on a 250ml beaker filled with H2SO4 / 0.5M CuSO4 solution. Connect the coulometer‚ transference vessel and the multimeter in series; connect the power supply with the connection cables. Wait for 60 to 90 minutes for the electrolysis at approximately 50 mA held constant. While waiting for the electrolysis
Premium Sulfuric acid Electrolysis Sodium hydroxide
purpose was to recover the original amount of copper after series of chemical reactions. Then returning the copper back to its original form. The copper wire originally weighted 1.0099 g‚ but after the copper was transformed into Cu(OH)2 to CuO to CuSO4 and finally into Cu‚ the mass of the recovered copper was 1.1023g; the percent yield was 109%. Since the percent yield is more than 100%‚ an error must have occurred somewhere in the lab. A possible error could have occurred due to removing the evaporating
Premium Chemistry Water Temperature
EXPERIMENT NO. 4 Chemical Equilibrium Claver‚ L. Z. X. Y.1‚ Palad‚ C. C.2‚ Rocha‚ R. D. P3 1Anthropology Department‚ College of Social Sciences and Philosophy‚ 2National Institute of Geological Sciences‚ College of Science‚ 3Department of Food Science and Nutrition‚ College of Home Economics‚ University of the Philippines‚ Diliman‚ Quezon City 1101 Philippines ------------------------------------------------- Keywords: forward and reverse reactions‚ equilibrium constant‚ Le Chatelier’s Principle
Premium Chemical equilibrium Blue Chemical reaction
collected the following data for a fixed volume of gas: Temperature (⁰C) Pressure (mm of Hg) 10 726 20 750 40 800 70 880 100 960 150 ??? Fill in the missing data point. Show all calculations leading to an answer. 2. You are given a clear solution of KNO3. Using 3 – 4 sentences (in your own words) explain how you would determine if the solution is unsaturated‚ saturated or supersaturated. 3. Explain why gasoline will not dissolve in water. 4. Explain in 3 – 4 sentences (in your own words) how
Premium Boiling point Hydrogen Nitrogen
Modbury High School SACE Stage 1 Chemistry Topic 5 Mole Concept and Stoichiometry Assignment 5: Volumetric analysis (titrations)‚ stoichiometry SOLUTIONS Note: Write answers neatly and legibly in your exercise book or on pad paper. ALWAYS include a title and name for your work and clearly indicate each answer. 1. a) 23.08 and 23.00 mL are concordant titre values. Average titre = (23.08 + 23.00) = 23.04 mL 2 b) Ca(OH)2
Premium Acetic acid Titration Laboratory glassware
Experiment 1: Study of Solubility Equilibrium Data Treatment and Analysis Section 1: Solubility Product Constant Temperature (˚C) | Volume of NaOH used (mL) | | | | Titration 1 | Titration 2 | Average | 28 | 12.7 | 12.8 | 12.75 | 9 | 10.5 | 10.5 | 10.5 | 19 | 11.3 | 11.2 | 11.25 | 40 | 16.2 | 16.2 | 16.2 | 50 | 22.8 | 22.9 | 22.85 | Table 1: The volume of NaOH used in the titration at various temperatures. No. of moles of KHC4H4O6 = 1.45 g ÷ 188.177g/mol = 7.71 x 10-3mol
Premium Solubility Thermodynamics Ion
Name SOLUBILITY CURVES Answer the following questions based on the solubility curve below. Which salt is least soluble in water .. at 2O° C? 2. How many grams of potassium chloride can be dissolved in 200 g of water at 80° C? IO 3. At 40° C‚ how much potassium _ __nitrate coin be dissoiu$tl ^n 30D.g of water? ------W- ’1 80 70 ...- O --60 0 5© 40 4. Which salt shows the least change 30 In solubility from 0° - 100° C? 20 10 At 30° C‚ 90 g of sodium
Premium Solubility Ammonia Solution