Investigation Investigate the amount of heat evolved when magnesium reacts with dilute acids. Planning What I am going to do I am going to find out how much heat is given out when magnesium reacts with a variety of dilute acids. In order to make comparisons between the acids‚ I shall use my results to work out how much heat would be given out if 1 mole of magnesium reacted with an excess of each acid. The acids I shall use are hydrochloric acid‚ sulphuric acid‚ nitric acid and ethanoic acid
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Blake Martinez November 1‚ 2013 Lab Write-up Group: Blake‚ Eric‚ Nadia‚ Fidelia Newton’s Third Law Purpose: The purpose of this lab is to calibrate two force sensors properly. Observe the directional relationship between force pairs. Observe the time variation of force pairs. We need to explain Newton’s third law in simple language. Materials: LabPro Interface Two Vernier force sensors .5kg mass String Rubber band DataMate Program Preliminary: 1. The force of the window
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References: http://webs.mn.catholic.edu.au/physics/emery/measurement.htm#Measurement http://www.digipac.ca/chemical/sigfigs/experimental_errors.htm http://www.tsb.gc.ca/eng/rapports-reports/rail/2011/r11v0057/r11v0057.pdf
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3-difluorobenzene) 3) The absorbance of a 0.0816 M solution of a molecule is measured using a 1.000 cm pathlength cuvette. Two peaks are observed in the spectrum‚ one at = 317 nm (A = 0.1286)‚ the other at = 284 nm (A = 0.7215). Assuming Beer’s law holds A = ac (3.1) what are the values for %T (percent transmission) and a (absorption coefficient‚ in units of L/mol.cm) for the molecule at the above two wavelengths? Also do the following from Atkins. Exercise 9.16b Estimate
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City University of Hong Kong Dept. of Physics & Materials Science AP2104 Mechanics of Solids Laboratory Manual Experiment 1 Pure Bending of a Beam Experiment 2 Torsional Deformations Experiment 3 Yield Criteria for Ductile Materials under Plane Stresses Experiment 1 Pure Bending of a Beam Objective 1. To examine the stresses at various positions of the beam under a constant load of pure bending. 2. To determine the curvature of deflection of the beam. Introduction
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A. ENG237-02: Transients in RC and RL Circuits 0. Introduction The objective of this experiment is to study the DC transient behaviors of RC and RL circuits. This experiment has divided into 6 parts: 1. Charging curve from measured data ( R = 10M Ω and C = 4 mF ) 2. Draw the charging curve by the graphical method 3. Discharging curve from measured data ( R = 5M Ω and C = 4 mF ) 4. Draw the discharging curve by the graphical method 5. Display of the charging and discharging
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transformations are that light must be absorbed by a compound in order for a photochemical reaction to take place‚ and that for each photon of light absorbed by a chemical system only one molecule is activated for subsequent reaction. This "photo equivalence law" was derived by Albert Einstein during his development of the quantum (photon) theory of light. Absorption of visible and/or ultraviolet light by a molecule transfers all the energy of the photon to one molecule. This is sufficient energy to excite
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Abstract: This report presents the reason why the ocean does not freeze in the winter. Since the ocean consists of salt water‚ an experiment was done to test the effect of freezing on salt water compared to pure water. The experiment was conducted three times in order to obtain accurate results and eliminate errors. In addition to the salt and pure water experiment‚ a variation of this experiment was created to test other options. In the variation experiment the effect of freezing on sugar water
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2/28/2013 Introduction: Hess ’s law is a terminology in chemistry named after Germain Hess‚ a Swiss-born Russian chemist and physician who published it in 1840. The law states that the total enthalpy change during the complete course of a reaction is the same whether the reaction is made in one step or in several steps. Enthalpy cannot be directly measured‚ but rather the change in enthalpy. Enthalpy is described as the change in kinetic and thermal energy. Hess’s law states that the enthalpy change
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rod shaped object‚ when a torque is applied on two sides’ perpendicular to the radius of a uniform cross-sectional bar. Objective : Determining the natural frequency of a system undergoing tortional vibration. Theory : Using Newton’s second law of tortional system. ( [pic] …………………. ( Equation 1 ) where Io = mass moment of inertia of the disk Hence‚ [pic] ……..……... ( Equation 2 ) where k = torsional stiffness of the shaft Rearrange
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