- Make sure the Compounds are no where close to your other sensory organs, remember that only your eyes are protected by the Goggles. -If a compound is spilled, wipe it up immediately and tell the instructor. Materials : powder forms of these compounds - LiNO3 - NaNO3 - KNO3 - Ca(NO3)2 - Ba(NO3)2 - - Unknown compound A - Unknown compound B - Goggles, Bunsen burner, distilled water, Q-tips, paper towel and a striker. Procedures 1- Turn on the Bunsen burner around the 45 degree angle. 2- Feel the gas on the top of the Bunsen burner with your hands, adjust if too high or too low.
It burns and can lead to permanent blindness if splashed onto eyes. Accordingly, safety precautions should be strictl when handling it. It freezes at 10.5°C. It fumes when heated, because some of the H2SO4 decomposes to H2O and SO3. The H2O is retained in the liquid, while SO3 gas is released.
9.9 Forensic Chemistry (1-i) Outline precautions that may be necessary to ensure accuracy and prevent contamination of samples for analysis There are three main sources of contamination 1. Addition of extraneous material, during collect, handling and transport such as soil etc. Precautions for this include using sealed containers, clean sterile utensils 2. State of laboratory- the cleanliness of the lab, including quality of air, presence of dust and other contaminants 3. Careless analysis- not wearing protective clothing such as gloves and coat and result in the adding of sweat, dandruff etc.
the alkali due to the use of caustic soda or soda ash and hydrogen peroxide, wetting agents and other auxiliaries would remain in the core of the fiber processed even after 2 or 3 washes. These residual chemicals like alkali's and peroxide are detrimental to the production of uniform flawless fabric production. The core residual alkali would lead to immature hydrolisation of the reactive dyes and results in streaky and uneven dyeing. | The residual peroxide present in the fiber will oxidize the reactive dyes' chromophore that contain the metal ions and lead to tonal variation and sometimes uneven dyeing. In some cases the chrmophore itself is getting destroyed into a colorless product and lead to pale or white patchy dyeing.
Lab Report 13: Ionic Reactions A product of Hands-On Labs, Inc. Authored by Peter Jeschofnig, Ph.D. Modified by Pamela Lee Hill, Ph.D., on Marvh, 2012 Review the safety materials and wear goggles when working with chemicals. Read the entire exercise before you begin. Take time to organize the materials you will need and set aside a safe work space in which to complete the exercise.
DC (NF/DJ) 27049/4 © UCLES 2011 [Turn over www.XtremePapers.net 2 Answer all the questions in the spaces provided. For Examiner’s Use 1 Ethanoic acid can be reacted with alcohols to form esters, an equilibrium mixture being formed. CH3CO2H + ROH CH3CO2R + H2O The reaction is usually carried out in the presence of an acid catalyst. (a) Write an expression for the equilibrium constant, Kc, for this reaction, clearly stating the units. Kc = units ................................................. [2] In an experiment to determine Kc a student placed together in a conical flask 0.10 mol of ethanoic acid, 0.10 mol of an alcohol ROH, and 0.005 mol of hydrogen chloride catalyst.
(50cm3 exactly), and pour the water into the copper calorimeter beaker. 6. Put the thermometer into the water (it should not touch the copper beaker) and record the temperature of the water at the start. 7. Hold the needle (with the nut), with a pair of tongs and set the nut on fire using the spirit lamp.
The toxins may range from the most powerful neurotoxin: botulism toxin, to biological agents, such as anthrax or plague. Furthermore, these Biological agents cannot be recognized through any odor or color and can be in the form of either liquid or powder. The indication of chemical attack includes sufferers showing signs such as nausea, difficulty in breathing, convulsions, and disorientation. Furthermore, the other key symptoms include unusual liquid sprays or vapors, death of animals in the area without any reason. There is nothing like one stop solution to Chemical attack, however there are few precautions which we can take during and after the chemical attack in order to prevent the effect of the chemical effect.
The solutions that my group chose to test were salt, sucrose, and rubbing alcohol. Rubbing alcohol is a clear, colorless, liquid with a distinctive odor. It is irritant to body tissue and you should seek medical attention if it touches your skin or eyes. It is a class 1 B flammable liquid. Salt is odorless and is slightly toxic by ingestion.
using Data Tables, Charts, Graphs, Diagrams, Sketches, Sentences, etc. for the lab. • BE SURE TO LABEL all information and UNITS of measurement. • If there is a Calculations and Data sheet provided with the lab, also write: “Refer to Calculations and Data Sheet” in your lab report. Then, complete the “Calculations and Data Sheet” and attach this AFTER the previous information on your lab report.