This is done by a procedure called refluxing. Refluxing is the process of heating a product to the boiling point and re-condensing the vapor continuously. The procedure halogenation is the addition of a halogen to a π bond forming a halo alkane. In this synthetic reaction bromine was used in the process called bromination. 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.
How is chemistry used in firefighting Chemistry is at the heart of combustion. Indeed, combustion - fire - is applied chemistry, chemistry in action. That's why some knowledge of chemistry is important in fighting fires. The firefighter employs strategy and tactics to contain and extinguish fires that are all directly or indirectly based on a knowledge of the chemistry of fire. The fire triangle, for example, is basic chemistry.
What are the identities of the substances found after electrolysis and heating? The identities of the substances found were Iodine, Iodide ion (I-), Triodide ion(I3-), Zinc metal and Zinc ion(Zn2+) Post Lab questions: 1. What did this experiment convincingly show about the composition of the white solid? I put that the experiment showed us the white substance was comprised of Zinc ions and iodide ions, and that the two ions and be separated back into their respective elements 2. During the electrolysis, a gray solid formed on the negative wire of the battery and the dark red solution formed at the positive wire of the batter.
Lab 4 – Energy Sources and Alternative Energy Experiment 1: The Effects of Coal Mining Table 1: pH of Water Samples | Water Sample | Initial pH | Final pH (24-48 hours) | Pyrite | | | Activated Carbon | | | Water | | | POST LAB QUESTIONS 1. Develop hypotheses predicting the effect of pyrite and coal on the acidity of water? a. Pyrite hypothesis = b. Coal hypothesis = 2. Based on the results of your experiment, would you reject or accept each hypothesis that you produced in question 1?
Lastly, we got to witness and test the Law of Conservation of Mass through the reaction in this experiment. The list goes on, but these are just a few objectives from the recently conducted lab experiment. Background: Before this experiment we had knowledge on the safety of most of the materials we worked with. Copper (II) Sulfate is harmful by inhalation or ingestion. Iron (II) Sulfate is also harmful if ingested, and could cause death.
In the 1950’s, some welders started to use carbon dioxide as a shielding gas as an alternative to the more expensive argon and helium. It proved to be ineffective for welding aluminum and magnesium because it reduced the weld quality, so it is rarely used today. The use of any shielding gas containing oxygen will quickly contaminate the tungsten electrode and should not be used in GTAW. GTAW is a widely used process for welding metal. Its arc is established between the tip of a non-consumable tungsten electrode and the work piece with a shielding gas applied to protect the arc and the weld pool area.
Energetics Aim: To measure the energy released from the complete combustion of a known mass of alcohol or paraffin wax, to heat water. Hypothesis: The combustion of alcohols is exothermic. In this experiment the energy is released from burning a known mass of alcohol in order to heat a known amount of water. A comparison of various alcohols and paraffin wax (methanol, ethanol, propanol, butanol, octanol and candle) as fuels can be made by calculating the quantity of energy transferred to the water. In this experiment, the amount of energy (heat) involved in a chemical change will be determined.
Ethan D. Wilhelm September 10, 2012 Chemistry 121 section 8 Friday 9-12 Sarah Gains Unknown Substance Lab Purpose: The purpose of this lab was to identify an unknown substance B by finding enough of its physical properties that we could eliminate all substances it can’t be. We use micro lab to help us find the boiling point, freezing point and mass. Then we tested the solubility of the unknown substance in water, hexane, and Alcohol. With this information we were able to find the identity of the unknown substance B. Procedure: Throughout this lab we were finding the physical properties of substance B.
When the fuels combust, oxygen and fuels react, and heat released. The water then absorbed the heat from the combustion. In this experiment the calorimeter of energy is used to measure the temperature of the heat that is released from the cashew. The equation to find the energy produce during
Not to mention the many acres of forest these genetically modified foods are preserving. Other than these few good reasons, I see ones to state quite the contrary. Genetically modified foods are indeed harmful due to irradiation and the risks they pose to our environment. Irradiation is one of the worst things that could have ever happened to our food. Gary Gibbs, D.O.