sterile media and equipment. The sterility of these tools is maintained by proper handling procedure‚ which prevents the introduction of contamination. The basics of aseptic technique are: Autoclave or steam sterilization of all equipment and media. Flame sterilization of wire loops and needles which are used to transfer bacteria from one growth condition to another. Flaming the mouth of test tubes and other containers to establish hot air convection out of the container‚ to reduce the chance of
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Flame Main article: Flame A candle’s flame Photo of a fire taken with a 1/4000th of a second exposure A flame is a mixture of reacting gases and solids emitting visible‚ infrared‚ and sometimes ultraviolet light‚ the frequency spectrum of which depends on the chemical composition of the burning material and intermediate reaction products. In many cases‚ such as the burning of organic matter‚ for example wood‚ or the incomplete combustion of gas‚ incandescent solid particles called soot
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OBJECTIVE The purpose of this lab will be to brominate trans-stilbene by using acetic acid and pyrimidium tribromide by refluxing the mixture. To test the purity of product I will take the melting point which should be around 240 ºC along with a flame test which should be green-blue. CHEMICAL PROPERTIES TABLE See Attached Lab Notebook Copies REACTION MECHANISM In this lab we used multiple techniques to complete and verify the bromination of trans-stilbene. First technique we used was to reflux
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4/29/2013 5.1 Lab Report - Identification of Metallic Ions TITLE: LAB 5.1 IDENTIFICATION OF METALLIC IONS PURPOSE: In this lab we are learning how to observe and perform “flame tests”‚ of alkali and alkaline earth metal ions. We will use basic lab equipment provided in our Labpaq‚ and follow all safety precautions in this lab. From reading the discussion and review‚ we understand that the normal configuration of the electrons is called “the ground state”. We understand that they are
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in flames and collected the resulting color of the flame. With this information‚ we consulted the chart that shows the representative wavelength and wavelength region in nanometers of different colors to make an educated guess on the possible wavelength of each collected flame color. For the lithium ion we observed a red colored flame (690 nm wavelength)‚ the sodium ion had a yellow orange flame (597 nm)‚ the potassium ion had a salmon pink flame (420 nm)‚ the calcium ion a light orange flame (607
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observe the flame tests of some alkali and alkaline earth metal ion 2. Define ground state and excited state of an atom. Ground state- normal configuration of the electrons about the atom or the ion of an element; stable particle electrons are at lowest possible energy level Excited state- when stable particles are heated to very high temperatures some of the electrons leave their ground state and become “excited”; these electrons move to higher energy levels 3. What is flame test? Why do
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families. The German men start to shout and beat people with sticks as they depart the train. Wiesel writes‚ “In front of us‚ those flames. In the air‚ the smell of burning flesh. It must have been around midnight. We had arrived. In Birkenau” (28). In this quote the flames symbolize imminent death and a change in his life because the author directly relates the flames that he sees to the smell of burning flesh. This correlation provides the reader with
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effectiveness of the tuba-tuba plant in producing biogas which can be an alternative source of gasoline. Specifically‚ it aims: a) To know if there is really flame produce by the biogas digester. b) To determine the colour of the flame for us to identify the type of flame produce by the biogas digester c) To know how long the flame from the biogas digester will last. SIGNIFICANCE OF THE STUDY Nowadays the price of the gasoline is becoming more expensive due to the reason that any parts
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Metallic Ions Metallic ion Flame color Sodium Na+ Orange Strontium Sr2+ Pink/Red Potassium K+ Light blue/Purple Barium Ba2+ Yellow Copper Cu2+ Green Lithium Li+ Pink Calcium Ca2+ Pink/Orange Unknown Pink/Red - Strontium QUESTIONS: A - All chemical used in this test are binary compounds. What portion of the periodic table is responsible for the color observed? The metals portion. B - In cooking over an open flame‚ a yellow flame is often observed when some
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Report for Experiment #7 Student’s Name __________Lisa __________ Date of Experiment _08/03/2013__________ Date Report Submitted ______08/05/2013___________ Title: Identification of Metallic Ions Purpose: To perform and observe the flame tests of some alkali and alkaline earth metal ions. Understanding Light Introduction: Electrons from an atom can absorb energy and become excited to move from the stable “ground state” energy level to a higher energy level. Imagine one
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