Exothermic Lab Report

Introduction: In this experiment, we are required to discover the 2 unknown chemicals provided by the teacher through the usage of different lab equipment and scientific procedures to conclude what the unknown substances are. The findings/results will be presented in a qualitative table and further discussed. There are 6 possible substances that the 2 unknowns could be. If the substance is benzoic acid then it would have to pass the organic solvent test because it dissolves in only organic solvents, while if it were silicon dioxide it would fail both solubility tests for organic and aqueous solvents.

(Wood, 2011.) From the initial blue color, if the solution’s colors change to brown, red, yellow or green, it proves that the aldehyde functional group, acting as the reducing agent, is present and thus the solution is a reducing sugar, because when the free aldehyde group of reducing sugars are heated up and reacted with CuSO4, the electrons will emerge from the aldehyde group to form Cu2O which would have a brown tint. (Simoni et al.,

Introduction Heat is the form of energy, thermal energy, which flows between two substances due to their difference in temperature.1 The measurement of heat flow is called Calorimetry and the apparatus used to measure the heat flow (temperature change) for a reacting system is called a calorimeter. The calorimeter is well-insulated device that help to minimize the heat exchange between the system being observed and its surroundings. In this experiment, simple calorimeter, coffer cup calorimeter containing Styrofoam cups is used. Calorimeter contains a thermometer and a stirrer.3 Thermometer is typically inserted in the calorimeter to measure the change in the temperature that results from the reaction.

With the reactions that the group did in this experiment the equilibrium changes wherever in order to balance the ratio between the products and reactants. The system changes in favor of the side with the least amount of stuff. When the group added heat to the system resulted in a decrease in the concentration of FeNCS2+. When the increasing the temperature it the reverse reaction of the system was the take away the heat. In the ice bath, the opposite was observed.

This particular experiment is done as part of my Organic Chemistry course. I was really interseted to do this experiment and I worked out well in this experiment. This experiment was related to the preparation acetaminophen.   Acetaminophen is an analgesic compound.

The above hypotheses were partially correct and partially incorrect. After adding catalase to Hydrogen Peroxide (HP), the temperature did increase rapidly, but then started to decrease in temperature. The second and third hypotheses were incorrect. In both cases, the temperature rose under a degree or did not rise at all, which contradicted the hypotheses.

In Physical Chemistry, the bridge between chemistry and physics, usually begins with the study of thermal energy, otherwise called heat. Most reactions either release or consume energy. This loss and or gain of energy can be referred to as either Endothermic-gaining heat, or exothermic- losing heat. it is imperative that chemists understand thermal energy so that they understand how molecules react. The basis of this lab will be to observe three experiments while the react.

Experiment 13.1 Purpose: To determine the ∆H of a chemical reaction. Materials: 2 Styrofoam cups, Thermometer, Vinegar, Mass Scale, Measuring tablespoon and ½ teaspoon, Lye, and Safety goggles.

Two Styrofoam cups and a thermometer through its lid served as the calorimeter where the reactions took place. Using the heat transfer equation, the enthalpy of the first reaction was computed to be -1.080 kJ/mol. On the other hand, the enthalpy of the second reaction was +1.409 kJ/mol. The first reaction had a negative enthalpy and was therefore an exothermic reaction. The positive enthalpy of the second reaction showed that it was endothermic.

Title: 3.5 Thermal Radiation Date Experiment was performed: 23/2/2018 Lab Partners Name: Dylan Loughnane (15152642) Mark Timlin (14165457) Author of Report: Rebecca Gavin (16153111) Name of Module: Thermal Physics (PH4042) Aims: In this experiment we're trying to show how heat transfer is a mechanism of conduction, convection and radiation. We do this with a two part investigations. First part of the lab will test the stefan-boltzmann constant at high/low temperatures and how different temperatures.

In conclusion temperature change did affect one of the tubes in two very different ways whilst concentration also played a role in the change of the product and reactant. Le chatelier's principle states that through change in temperature, change in concentration and adding pressure you can create an equilibrium where there can be a forward reaction and a reverse reaction. By continuously adding and taking away heat and changing concentration we have created these reactions. When we took away the heat by putting it in the ice bath it would shift left while when we added heat to it would shift right. We saw this reaction take place as there was color change in tube 2 compared to tube 1.

o Last updated: Sep 23 2009  http://www.scientificamerican.com/article/what-is-an-exothermic-rea/ o Date of use: 15 February 2015 o By: Van Hecke G.R. o Last updated: 27 September 1999  http://chemistry.about.com/od/endothermicexothermic/ss/Exothermic-Reaction-Examples-Exothermic-Demonstrations-To-Try11.htm#step-heading o Date of use: 15 February 2015 o By: Helmenstine A.M. o Last updated: 5 February 2015  http://www.sciencedirect.com/science/article/pii/S036012859000598 o Date of use: 15 February 2015 o By: Zeng K. and Zhang D. o Progress in Energy and Combustion Science, Volume 37, Issue 5< September 2011, Page 631  http://www.ngopulse.org/article/use-gas-safely-home-summer o Date of use: 15 February 2015 o By: Kulati P. o Last updated: 3 December 2014  http://www.propane101.com/carbonmonoxideandpropane.htm

Then, the boiling tubes were left in a water bath at 45°C. After 5minutes, the boiling tub, labelled A, was withdrawn from the water bath. 4) The sample was filtered using a Buchner funnel, collected in a sample vile, labelled A, and positioned securely to dry and crystallise in an oven at 65°C. 5) After 45minutes, the boiling tube, labelled

Then it was treated with alcohol and the resulting iron free residue was a reddish purple color

Modernized homes across the planet generally utilize paraffin wax as an alternate source of light in case the power goes out. Understanding the heat of combustion of a lit candle will allow people the knowledge of how effective a candle really is. This lab on the heat of combustion of paraffin wax tests students on their ability to use the previously mentioned ideas and concepts as well as their understanding of calorimetry. The students will calculate the efficiency of a paraffin wax candle and a material of choice by determining the heat of combustion. Fully understanding calorimetry is a very important skill to have whilst analyzing fuels.