Marco Grogan‚ Emily Hendrigan Group 6‚ period 5 10-05-17 A cold pack is a device that creates an endothermic reaction by mixing water and one of many possible chemicals. In the scientists’ experiment they will find out which chemical will keep the water cold the longest. The independent variable for the experiment is the amount of chemicals (in teaspoons) added to each cup of water‚ while the dependent variable is the temperature of the water before and after the experiment‚ and the constant
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of medical product to treat an injury is crucial for the injury to heal. A common product used in treatment of injury is a cold pack. After injury‚ it is common practice to ice the affected area to reduce swelling and therefore soothe the area. There are many types of cold packs that can be used‚ the most common being ice in a bag of sorts. Another popular kind of ice pack is disposable that consists of a small‚ thin compartment that contains a salt (NH4NO3) inside a larger‚ thicker compartment
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Endothermic Reactions of Cold Packs An instant cold pack is a device that is made up of two bags; one containing water‚ and an inside bag containing ammonium nitrate. Have you ever wondered how people use hot packs to warm up their hands in the winter or use cold packs on a real terrible injury? How can this package produce heat or cold by only shaking or crushing those packs? Ammonium nitrate is a chemical compound that is a white crystalline solid used as fertilizer and as a part of explosives
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Since time immemorial‚ Indians have been bombarded with snacks-to-go by street vendors; fastfood is neither a modern phenomenon‚ nor a western innovation. But as increasing numbers of international players enter the domestic market‚ there are bitter lessons to learn about what local consumers will and will not welcome. just-food.com’s Debasish Ganguly reports from India on the evolving sector and the challenges facing new entrants into the fastfood market. Fastfood is not an alien concept to Indians;
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Chemical Reaction: Cold Packs CHM110 Chemical Reaction: Cold Packs Introduction Chemical reactions happen every day in a variety of ways. We will explore the science behind cold packs and the chemical reactions that happen at the molecular level. Furthermore‚ we will examine and explain what chemical bonds are formed‚ broken‚ or both. The product is a simple construct of two bags: one containing water (solvent) and the other a chemical compound called ammonium nitrate (NH4NO3). In order to activate
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Chemistry 121 Colligative Properties Lab Demonstration of Selected Calculations from Choice I Determination of Kf for Naphthalene To determine the Kf for naphthalene‚ we need to find the difference in the freezing point of pure naphthalene and the solution of 1‚4-dichlorobenzene in naphthalene. Let’s say that we did this experiment‚ used 1.00 g 1‚4-dichlorobenzene in 10.00 g naphthalene‚ and found that the freezing temperature of pure naphthalene was 78.2°C‚ while that of the solution was 75
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The purpose of this lab was to see which solutions are soluble and which are not. We were able to see this by mixing certain solutions together and observing changes that occurred. The procedure for this experiment included a few different steps. The first steps were to add the nitrate solutions into the lettered parts of the 96-well plate. Once you were done with that‚ you were supposed to add the sodium solutions to the numbered parts of the 96-well plate‚ so that the solutions were added together
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Chemistry 3373F Lab Manual 2008 Modified 11/07 Table of Contents Chem 3373 Laboratory Schedule for Fall 2008.............................................................................2 The Benzoin Condensation of Benzaldehyde ..............................................................................3 Synthesis of Dilantin and Related Compounds (two weeks).........................................................6 Synthesis of an Alkaloid: Pseudopelletierine (two weeks) .............
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ATLANTIC COLLEGE CHEMISTRY DEPARTMENT (Written by Dr Geoffrey Neuss) CONTENTS Page Introduction 1 Assessment of Practical Work 3 Error and uncertainty 7 Significant figures 8 Title 1. Some common chemical reactions. 9 2. A traditional acid-alkali titration. 10 3. Analysis of aspirin tablets
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to observe a shift in equilibrium concentrations associated with changes in temperature 4. to explain the observations obtained by applying Le Chatelier’s principle Materials Required: See page 209 Heath Chemistry Laboratory Experiments Procedure: See pages 209-211 Heath Chemistry Laboratory Experiments Data and Observations: Table 1 Equilibrium Involving Thymol Blue REAGENT ADDED STRESS (ION ADDED) COLOR OBSERVATION DIRECTION OF EQUILIBRIUM SHIFT HCl (Step
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