1. Obtain 1 gram of an impure‚ unknown substance solid. Make sure to stir the mixture before measuring the sample; record the mixture’s code in the data section. 2. Add approx. 25-50 mL of water and several boiling chips to a 125 mL Erlenmeyer flask and heat the water to a gentle boil using a hotplate. 3. On a second hotplate‚ place a 125 mL Erlenmeyer flask containing the one gram of unknown solid along with a boiling chip. 4. Using a ring clamp‚ slowly pour approx. 5-10 mL of boiling water into
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Analyzing a Hydrogen Peroxide Solution Purpose: The technological purpose of this investigation is to test and evaluate the percent concentration of consumer solution of hydrogen peroxide. Problem: What is the percent concentration of hydrogen peroxide in a consumer product? Design: An acidic solution of primary standard‚ iron (II) ammonium sulfate-water (1/6)‚ is prepared and the potassium permanganate standard. A 25.0 mL sample of a consumer solution of hydrogen peroxide is diluted to 1
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BLG & Co.‚ CPAs 306 3rd Flr. MSA Second St.‚ Ayala-Alabang‚ Muntinlupa City Philippines SUBSTANTIVE TESTS – PURCHASE/ACQUISITION TRANSACTIONS ASSERTIONS OBJECTIVE PROCEDURES I. Existence Or Occurrence II. Rights and Obligations To determine that recorded purchases are for items that were acquired. To determine that purchases are the entity’s acquisitions and liabilities. For a sample of purchase transactions recorded in the purchases journal‚ trace vouchers to authorized purchase
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Reaction of catalase with hydrogen peroxide AIM: I aim to find the rate of reaction between catalase and hydrogen peroxide. Enzymes such as Catalase are protein molecules that are found in living cells. They are used to speed up specific reactions in the cells. Each enzyme just performs one particular reaction so they are all very specific. Catalase enzymes found in living cells e.g. in yeast‚ potato or liver‚ speed up (in our case) the breaking down of hydrogen peroxide. The lock and key analogy…
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Ocean County College Department of Chemistry Identification of Metallic Ions Purpose: The purpose of this lab exercise was to perform and observe the flame tests of some alkali and alkaline earth metal ions. When electrons in metallic ions are grounded‚ their configuration is stable. In other words‚ the loosely bound electrons in the valence shell of the atom are satisfied at their “low” energy state. They do not require to be balanced by emitting any type of radiation or receiving any
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RESEARCH OF SUBSTANCE ABUSE AND NURSING A major health problem in the United States is substance abuse. Substance abuse is the misuse of‚ illegal drugs‚ alcohol‚ inhalants prescription drugs‚ and other substances that change how the mind and body work. Drugs that are most commonly abused are alcohol‚ nicotine‚ marijuana‚ amphetamines‚ barbiturates‚ cocaine‚ opium alkaloids‚ and synthetic opioid. These drugs are either excessively used or not used for its intended purpose. Substance abuse transcends
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This reaction involves the oxidation of iodide ions to iodine molecules which are soluble in water and are visible as a pale brown clear solution. The formation of the iodine can easily be detected because all other species in the reaction mixture are colourless. The addition of starch to the reaction mixture further enhances the colour change by forming a dark blue-black complex with the iodine. The overall ionic equation is: (the spectator ions K+ have been left out to see the electron transfer
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PLANNING Investigating the Kinetics of the reaction between Iodide ions and Peroxodisulphate (VI) ions By the use of an Iodine clock reaction I hope to obtain the length of time taken for Iodine ions (in potassium iodide) to react fully with Peroxodisulphate ions (in potassium Peroxodisulphate). I will do three sets of experiments changing first the concentration of iodide ions‚ then the concentration of Peroxodisulphate ions and finally the temperature of the solution in which the reaction is
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Describe how hydrogen bonding occurs between water molecules‚ and relate this and other properties of water‚ to the roles of water in living organisms. Water is a very small molecule‚ consisting of two hydrogen atoms covalently bonded to an oxygen atom. However the electrons shared are not done so equally‚ oxygen is more electronegative and has a firmer hold on the electrons and pulls them slightly towards its nucleus. Due to this‚ the charge across the molecule of water is not equally distributed
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Ultimate Health Ltd launches face mask in support of Asthma Foundation Ultimate Health Ltd introduces lavender-scented face-mask with revolutionary technology (Hong Kong – 10 April 2013) Since the lavender-scented face-mask was successfully introduced in the Hong Kong International Medical Devices and Supplies Fair last month‚ Ultimate Health is officially going to launch this revolutionary product in the launch event‚ which will be held at Shangri-La Hotel on 4 May. In the event‚ the company will
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