Endothermic

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    Ammonium Nitrate Case

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    I am writing to you to give you information about what compound is best for a cold pack and why. In a cold pack, what you want is an endothermic reaction, in which heat is absorbed, and not an exothermic reaction, in which heat is released. After researching and testing multiple compounds, I have concluded that Ammonium Nitrate is the best compound for a cold pack. One of the most important factors in choosing a compound for a cold pack is how cold it will get, because of this, Calcium Chloride is a bad choice for a cold pack as it is an exothermic reaction and releases heat. On the other hand, Ammonium Nitrate had the largest drop in temperature, with a drop of 9.6° celsius. This is good for a cold pack as a cold pack is supposed to get cold, hence the name, and if it doesn’t, no one will buy your product. Furthermore, how long it stays cold is just as important as how cold it gets. Ammonium Nitrate stayed cold for 6 minutes before the temperature started rising. In comparison, Potassium Nitrate only stayed cold for 3 minutes before the temperature began to rise. This is…

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    Heat Dissolving Lab Report

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    How the changing mass of solute effects the heat given out when dissolved in water Aim To investigate how the changing mass of a solute will affect the energy given out. Introduction Dissolving is when a solute is mixed into a solvent to form a solution. Dissolving can be either endothermic or exothermic. Endothermic reactions happen when the energy given out when bonds are broken, is greater than the energy given out when bonds are made. As more energy is used and taken in, the surroundings…

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    The term Thermochemistry refers to when heat is evolved or absorbed during a chemical reaction. When calculating the amount of energy, the number will always be expressed as a positive number. A negative sign will indicate whether the energy is evolved or absorbed. If the sign is negative, then the energy is evolved and if the sign is positive, then the energy is absorbed. The amount of heat that is released or absorbed will also be in units of Joules or Kilojoules per mol. There are two other…

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    and temperature. A sufficiently rigid enzyme molecule can perform its task without getting denatured at high temperature and hence do not need any further efforts for stabilization. Enzyme always needs a fixed level of flexibility to function and rigidity to be stable under environmental conditions. 1.5.2.1. Need for temperature stability The advantages of using high temperature in the reactions are: • Higher process rates (if reaction temperature increase from 25 to 75ºC, the process rate…

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    Temperature is one of the most important factors that affect an organism’s metabolic rates. In ectothermic organisms, their metabolic rate depends on the external environmental conditions. If temperature increases, so will their metabolic rates. Endothermic organisms do not depend on external conditions but rather can produce and maintain the generated heat within their systems to maintain their bodies at a constant temperature. If temperatures increase or decrease above or below the desired…

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    cooling graph representing an exothermic or endothermic process. Kinetic energy is the energy of a system that is in motion of the particles in the system. Potential energy is the energy of a system in which it represents the arrangement of the particles of the system. Kinetic energy and potential energy never increase or decrease at the same time, however, when one energy is changing the other remains constant. During a phase change, the potential energy either increases or decreases while the…

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    I performed the vinegar and baking soda experiment. The first thing that happened when I poured vinegar on top of the baking soda was an overflow of fizz and bubbles. These bubbles were the carbon dioxide escaping from the solution. White foam overflowed over the rim of the container. I felt the cup dropping temperature slightly as the reaction took place. The temperature dropped about 6 degrees Celsius. The remaining solution was a filmy and diluted. The result was sodium acetate dissolved in…

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    Endothermic or Exothermic? The energy changes lab was an interesting lab in which the class compared two chemical reactions, the solute baking soda and the solvent vinegar, and the solvent baking soda solution with the solute of calcium chloride to see whether the changes were endothermic or exothermic reactions. I concluded that vinegar and baking soda was the endothermic reaction and baking soda solution and calcium chloride was the exothermic reaction. I knew this because in the vinegar and…

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    Alicia Shull 10-19-15 Endothermy in Bipedal Dinosaurs Dinosaurs are an extinct species that have been fascinating paleontologist’s, and impressing those with recreational interest for centuries. One of the many mysteries associated with dinosaurs is whether or not they were endothermic, exothermic, or a combination of both. It is important to distinguish whether or not dinosaurs were endothermic or exothermic because the determination plays a role in the reconstruction of their ecology. This is…

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    Cold Pack Hypothesis

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    The topic for the experiment is how a cold pack can be improved. The problem statement is “Which chemicals would work best at lowering the temperature of water to improve a cold pack?”. The Independent variables are the are three chemicals, ammonium chloride, sodium chloride, and calcium chloride, that will be added to the water. The dependent variable is the temperature of the water in degrees Fahrenheit after the chemicals are added. The constants are the 50 mL of water in each cup, the…

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