Results: Zinc Metal - Iodine - Iodide + Triodide + Zinc Ion + Focus Questions: 1. Is there a way to put energy into Zinc Iodide in order to regain the elements, zinc and iodine? If there is a way, how does it happen? Yes, this can be done through electrolysis using a battery and exposed wire tips. Take sample of Zinc Iodide and dissolve in solution.
The bromine is acting first like an electrophile, and then after bromine has broken the π bond, a carbocation has formed, and a bromide ion has been created, the bromide ion then acts as the nucleophile and forms a bond with the carbocation. This experiment uses bromination, the specific name of halogenation with bromine. In order to for bromination to occur bromine must first be generated. This is done in situ through the oxidation of glacid acetic acid and puridinum bromide perbromide. Once generation is accomplished the available bromine can be brominated.
The study of specific heat falls under the category of Thermochemistry which is further divided into the category of Calorimetry. An instrument called a calorimeter is used to measure specific heat. A piece of metal is placed in a container of water. This is then boiled. The piece of metal is then taken out of the boiling water and placed in a calorimeter which contains room temperature water.
Reactants are substances that take part in and undergo change during a reaction. Products are substances that is formed as the result of a chemical reaction. Another concept that was introduced with this lab was stoichiometric ratio which is concerned with, involving, or having the exact proportions for a particular chemical reaction. Exothermic was also a concept introduced in the lab which is a reaction or process accompanied by the release of heat. And limiting reagent which is the reactant that is completely consumed when a reaction is run to completion.
Introduction: In this lab there were several purposes. Each purpose was to help further the class’s understanding of thermodynamics. Thermodynamics studies the changes in chemical and physical reactions and how energy influences those changes. The purposes of the lab were to decided which of the four given substances would make a good hot pack or cold back, to be able to design a hot pack and cold pack for specified temperature changes, to calculate the amount of heat released or absorbed by one gram of calcium chloride or ammonium nitrate, and to calculate the percentage error in the experiment. In order to understand the lab one must also understand endothermic and exothermic reactions.
(4 points) q = m × c × Δt Given: q=? m = 34.720g c = 4.18 j/(g x °C) Δt = 41.6°C - 25.2°C = 16.4°C q = (34.720g) (4.18 j/(g x °C) (16.4°C) q = 2380.13j You are trying to figure out the energy change of the water which is the surroundings in the lab. To do that you must take the mass of the metal, which for me was Aluminum, and multiply it by the heat capacity of the water, which was given, then multiply that by the change in temperature, which is the final temperature of the mixture
Extracting the metal from the solution is the first step in the process of hydrometallurgy. A great way to do extraction is leaching, in which the ore is dissolved into an acid or base. Then the leached solution is purified and the waste can be discarded. Lastly the metal is precipitated through chemical or electrolytic processes. This lab will also rely on some skills and techniques that were utilized in previous experiments, such as the using of amphoteric metals, amphoteric hydroxide solutions, and complex ion formation.
* He invented the electrophorus, a device used to generate static electricity. *
The purpose of the lab was to determine which reactant was the limiting reactant, and to see how much of the other reactant was used. The true molarity of a compound can be defined as the amount of moles per liter of that substance. The equation of this single displacement chemical reaction done during this lab is 2Al(s) + 3CuCl(aq) → 3Cu (s) + 2AlCl2 (aq). In the reaction, the solid Aluminum replaces the Copper in Copper (II) Chloride to produce solid copper, and Aluminum Chloride. In order to find which reactant is the limiting reactant, an equation based on the molarity of the Copper (II) Chloride may be used, or the products of the reaction may be observed.
DataQuest Properties of Solutions: Electrolytes and Non-Electrolytes 22 In this experiment, you will discover some properties of strong electrolytes, weak electrolytes, and non-electrolytes by observing the behavior of these substances in aqueous solutions. You will determine these properties using a Conductivity Probe. When the probe is placed in a solution that contains ions, and thus has the ability to conduct electricity, an electrical circuit is completed across the electrodes that are located on either side of the hole near the bottom of the probe body (see Figure 1). This results in a conductivity value that can be read by a datacollection interface. The unit of conductivity used in this experiment is the microsiemens per centimeter, or µS/cm.