Introduction The major component of eggshells is calcium carbonate (CaCO3). Calcium carbonate cannot be dissolved in water‚ but can dissolve in an acid using the reaction: 2HCl(aq)+CaCO3(s) Ca2+(aq)+CO2(g)+H2O+2HCl-(aq) This reaction is not used to titrate the CaCO3 because it is very slow when the reaction is close to the endpoint. Instead adding an excess of acid to dissolve all of the CaCO3 and then titrating the remaining H3O+ with NaOH solution can achieve the determination of the amount
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The Pit and the Pendulum vs. Dr. Heidegger’s Experiment: Not Quite So Different Poe’s “The Pit and the Pendulum” is about a man that is put through torture and Hawthorne’s “Dr. Heidegger’s Experiment” is about a doctor who gives four elderly people a taste of water from the Fountain of Youth. “The Pit and the Pendulum” and “Dr. Heidegger’s Experiment” are definitely different as far as content goes but when examined a little more closely clear similarities can be found. Subtle literary devices
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mean: 2.0 Displacement (meters and centimeters) (1) Work (0.1) Power (0.1) 11 m‚ 18 cm 559 279.5 11 m‚ 32 cm 566 269.5 10 m‚ 33 cm 516.5 271.8 11 m‚ 32 cm 566 257.3 10 m‚ 32 cm 516 286.7 10 m‚ 89.4 cm 544.7 273.0 Veloctiy (m/s) Displacement/Time Acceleration (m/s/s) Velocity/Time Trial 1 11.18/2.0 = 5.59 5.59/2.0 = 2.80 Trial 2 11.32/2.1 = 5.39 5.39/2.1 = 2.57 Trial 3 10.33/1.9 = 5.43 5.43/1.9 = 2.90 Trial 4 11.00/2.2 = 5.15 5.15/2.2 = 2.34 Trial 5 10.32/1.8 = 5.73 5.73/1.8 = 3.18 Mean:
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community as a whole is altered (Friedman 2017). To study succession‚ one must use one of the following methods: to observe any patterns that occur‚ to conduct experiments that manipulate specific variables in a community‚ or to construct a model that may undergo succession. One example of an experiment that measures microbial succession was an experiment observing changes in traditional Chinese soy sauce over time (Sulaiman et al. 2014). The fermentation of the soy sauce brine revealed that the primary bacteria
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Stanley Milgram: ’electric shock’ experiments (1963) - also showed the power of the situation in influencing behaviour. 65% of people could be easily induced into giving a stranger an electric shock of 450V (enough to kill someone). 100% of people could be influenced into giving a 275V shock. The Milgram Experiment Stanley Milgram (1963) Experiment: Focusing on the conflict between obedience to authority and personal conscience. Investigate: Whether Germans were particularly obedient to authority
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Calorimetry Experiment Purpose: The objective of this lab is to determine the enthalpy change for NaOH(aq) + HCl(aq) NaCl (aq) + H2O(l) Procedure: Before measuring the enthalpy of acid base neutralization‚ my partner Brian and I determined a calorimeter constant‚ using a homemade polystyrene calorimeter. With the following formula and data: qhot= cm (Tf-Ti) qcold=cm(Tf-Ti) SYSTEM DATA SURROUNDINGS DATA Water cold Mass: 50mL Water hot Mass: 50mL C=4.18 C=4.18 Ti=20 C Ti=31
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Experiment # Title Student Name: Student Number: Section Number: 0103 TA: Stephen Ho Date the experiment were performed: Date the lab report was submitted: Introduction: (Ideally‚ one pages‚ maximum 2 pages) * Background information (one paragraph) * Purpose of the experiment (Should be stated in few sentences) * Theory (One to two paragraph)‚ including chemical reaction equation Experimental: (1-2 pages) * Still need to mention that the procedure was adapted from
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EXPERIMENT 201: WORK‚ ENERGY AND POWER John Michael A. Ramos‚ Phy11l/A5 Abstract The essential conditions to be satisfied for work to be done are: Some force must act on the object. The point of application of force must move in the direction of force. W = F x s. SI unit of work is joule. Energy is the capacity to do work. The two types of mechanical energy are kinetic energy and potential energy. Kinetic energy is the energy possessed by an object by virtue of its motion. Potential energy is
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Discussion and Conclusion In this lab‚ a submarine Adventure: Density Saves The Day‚; I had made many of the calculation for the best result of the lab. My calculations section contains: the volume of the unknown metals‚ where I figure out the volume of each metal so that I will be able to determine its density in order to find its identity; the density of unknown metals‚ where I figure out the density of each metal so that I will be able to determine its identity; percent error between known
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Abstract Over a two week period of time in the laboratory‚ we experimented and tested the reaction rate of a peroxidase enzyme and the factors that affected it‚ both positively and negatively. The purpose of these experiments was to probe and manipulate the activity of the enzyme peroxidase by varying temperature‚ pH‚ the amount of enzyme compared to the substrate and the effect of hydroxylamine. Peroxidase activity is expressed when the potato extract is subjected to stresses such as low temperature
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