57 THE IODINATION OF ACETONE Part One: Determining the Rate for a Chemical Reaction The rate of a chemical reaction depends on several factors: the nature of the reaction, the concentrations of the reactants, the temperature, and the presence of a possible catalyst. In this experiment we will first determine the rate law for a reaction by changing some of the above variables and measuring the rate of the reaction. During Part Two, we will explore the relation between the rate constant and temperature to discover the activation energy for this reaction. In this experiment we will study the kinetics of the reaction between iodine and acetone: O C H3C CH3 + I2(aq) H3C H+ O C CH2I + HI(aq) The rate of this reaction is found to depend on the concentration of the hydrogen ion (acid, HCl) as well as the concentrations of the reactants (acetone and iodine). The rate law for this reaction is rate = k[acetone]m[H+]n[I2]p where k is the rate constant for the reaction and m, n, and p are the orders of the reaction with respect to acetone, hydrogen ions (acid), and iodine, respectively.
The mass of the products in a chemical reaction depends on the amount of A. excess reactant B. limiting reactant C. oxidizing agent D. reducing subtannce 14. What is the formula mass of CaCl2? (Ca = 40.1, Cl = 35.45) A. 75.6 amu B. 110.9 amu C. 111.1 amu D. 756 amu 15.
The first example is calculating empirical formulas from percent compositions using the percents of the different elements. Empirical formulas of compounds are also determined through quantitative analysis by using the masses of each element in the equation3. Lastly, this experiment uses the method of finding empirical formulas through combustion analysis. The empirical formula of magnesium oxide is found from the combustion of magnesium1. The four chemical equations that result when metal magnesium is heated in a closed crucible that becomes gradually exposed to the oxygen in the air are shown in table
A reaction in which a substance reacts with oxygen and produces water as one of the products is often referred to a s Combustion reaction. Identify the combustion reactions from the reactions shown on this worksheet. 22. Acid-base (or neutralization) reactions are recognized by the presence of an acid in the reactants, and water in the products. Identify the acid-base reactions from the reactions shown on this worksheet.
Give the abbreviated electronic configuration for Ti. c. Given the following orbital diagrams below, fill in the electrons (with up and/or down arrows) according to Hund’s Rule, Aufbau Principle and Pauli Exclusion Principle for Sn and Ti. (Diagrams are indicated for
From these equilibrium concentrations, the equilibrium constant for the reaction can be determined. The purpose of this experiment is to determine the equilibrium constant for the following hydrolysis of an ester reaction: CH3COOCH2CH3 (aq) + H2O (l) CH3CH2OH (aq) + CH3COOH (aq) Ethyl Acetate Water Ethanol Acetic Acid (EtAc) (EtOH) (HAc) The equilibrium constant, Kc, for the reaction will have the following expression: Several reaction mixtures will be prepared with different initial amounts of ethyl
EXPERIMENTAL DETERMINATION OF AVAGADRO NUMBER Purpose The objective is to make an experimental measurement of Avogadro's number. Introduction A mole can be defined as the gram formula mass of a substance or the atomic mass of an element in grams. In this experiment, electron flow (amperage or current) and time are measured in order to obtain the number of electrons passing through the electrochemical cell. The number of atoms in a weighed sample is related to electron flow to calculate Avogadro's number. In this electrolytic cell both electrodes are copper and the electrolyte is 0.5 M H2SO4.
Final exam chem 2014 Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. A central concept of the kinetic theory, one of the “big ideas” of chemistry, is the belief that a.|for every reaction there is an equal and opposite reaction.| b.|chemical reactions involve processes in which reactants produce products.| c.|the particles in matter are in a state of constant motion.| d.|every chemical process uses or produces energy, often in the form of heat.| ____ 2. In a chemical reaction, the type of products obtained is largely determined by which part of the reacting chemicals? a.|protons| b.|electrons| c.|neutrons| d.|nuclei| ____ 3.
Lab 5: Determination of a Chemical Formula (Expt 8) 1. Understand how to calculate: a. Mass ratio b. Mole ratio c. Percentage difference 2. Remember that Zn is in excess. Therefore the reacted Zn = initial mass – excess mass.
Experiment 14: Iodine Clock reaction Summary of principles: In this lab we will learn to measure the rate of a chemical reaction between persulfate ion and iodide ion. The order of the action will need to be determined in the order of the persulfate ion to the iodide ion. The method we will use is the Initial rate method. The activation of the reaction will be determined from the temperature dependence rates of the reaction. The lesson of the lab is to teach us about Chemical kinetics, speeds and arrangements of molecules in a reaction during the process it goes from reactants to products.