Download Chemistry Lab Exam 2: Kinetics, Oxidation States, and Titration and more Exams Chemistry in PDF only on Docsity! CHEM 103 Lab Exam 2 The _____ of a chemical reaction refers to the rate of the reaction. - kinetics List the four factors that control kinetics of a chemical reaction. - The nature of the reaction itself, the concentration of the reactants, the temperature, and the presence of a catalysts What color is the permanganate? - purple What color is the oxalate solution? - colorless What color change do you see in the rate of reaction lab when monitoring the chemical reaction between the oxalate and permanganate? - The color will change from a purple and fade to pink, which will fade to a peach-orange, which will fade to a pale yellow, which will fade to colorless What happens to the reaction rate when you reduce the amount of the reactants? - The reaction will be slower than the normal reaction because there will be less collisions occurring, causing the amount of successful collisions to be less and the reaction rate to be less What happens to the reaction rate when you increase the temperature of a reaction? - The number of collisions happening in the reaction increases and the amount of kinetic energy increases, causing the rate of the reaction to be faster What happens to the reaction rate when you use a catalyst? - The catalyst lowers the energy needed for activation, causing the rate of the reaction to be faster. What is a catalyst? - chemicals that increase the rate of a reaction, but are not used up or changed by the reaction What is the oxidation state of copper in the compound CuCl? - Cu+ What is the oxidation state of copper in the compound CuCl2 - Cu 2+ What is the role of sodium sulfite (Na2SO3) in the reaction to produce CuCl from CuCl2 and Na2SO3? - Sodium sulfite is the reducing agent in this reaction The amount of product you expect to get in a reaction - theoretical yield What will happen if the product CuCl comes in contact with air while you are carrying out the steps in the procedure? - The CuCl could easily undergo an oxidation reaction if it comes into contact with oxygen which is in the air, so we must be careful carrying out the procedure to prevent the reaction of unstable Cu+ Why is it especially important to read ahead, be prepared, and have all the washing solutions ready to use before starting the filtration of CuCl? - Once the filtration and washing is begun, it cannot be interrupted or wet CuCl will become exposed to air which will cause the oxidation of CuCl. It is important to be prepared so this does not occur. Which washing solvent in the synthesis of CuCl in step 10 of the procedure is extremely volatile and flammable? -
