Date of Experiment- 11/27/12 Date Report Submitted 11/27/12 Title: Caloric Content of Food Purpose: to be able to measure the energy content of foods Procedure: We are going to take food items and burn them to heat water to be able to determine the amount of “energy” a food source can emit. Data Tables: |Data Table 1: Food Item - Observations | |Food
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CHEMICAL Sodium Hydroxide (NaOH) PROCEDURE The recommended amount of compound ito use is around 0.1 moles. Add water into your caleriometer Add the solid salt and stir the mixture thoroughly and continuously. Calculate ΔHsol. Ignore the heat capacity of the caleriometer. _Results_ RAW DATA Tab.1. The different data required for the calculations. Trial Mass of NaOH / g (± 0.001 g) Volume of H2O / ml (± 1 ml) Initial Temperature / °C (± 1 °C) Final Temperature / °C (± 1 °C) 1
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An intensive property is a bulk property‚ meaning that it is a physical property of a system that does not depend on the system size or the amount of material in the system. Examples of intensive properties are the temperature and the hardness of an object. No matter how small a diamond is cut‚ it maintains its intrinsic hardness. By contrast‚ an extensive property is one that is additive for independent‚ noninteracting subsystems.[1] The property is proportional to the amount of material in the
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1. | | | What is the pressure‚ in atm‚ of a tank of gas with a regulator that reads 1250mmHg? | | | Student Response | Correct Answer | A. | 1.64 | | B. | 490 | | C. | 1.79 | | D. | 0.608 | | E. | 1.25 | | | Score: | 0/1 | | | 2. | | | A 147.9-L sample of dry air is cooled from 88.0°C to 22.1°C while the pressure is maintained at 2.85 atm. What is the final volume in L? (Do not type the units.) | | | Student Response | Correct
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Tmaximum - Tminimum = 45 – 20 = 25 0C * Calculate the number moles of copper sulphate reacted: number of moles = concentration x volume = 0.5 x 0.025 = 0.0125 mol * Calculate energy released during the reaction (Q): Q = mass of CuSO4 x specific heat capacity x ΔT = 25 x 4.2 x 25 = 2625 J * Calculate ΔH for the reaction (energy change is negative because the reaction was exothermic): ΔH = -Q / number of moles = 2625 / 0.0125 = 210 kJmol-1 ‘Absolute Uncertainty’ = abs/unc ‘Percentage Uncertainty’
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Cambridge International Examinations Cambridge Ordinary Level * 8 7 0 6 7 3 2 3 4 6 * 5054/32 PHYSICS Paper 3 Practical Test May/June 2014 2 hours Candidates answer on the Question Paper. Additional Materials: As listed in the Confidential Instructions. READ THESE INSTRUCTIONS FIRST Write your Centre number‚ candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples‚ paper
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convection process rather than mechanical transmitting source‚ which captures the heat energy of sun and delivers it during winter and pumps out the heat in summer‚ using heat distribution methods. Some of the heat distribution methods are Convection‚ Conduction‚ and Radiation. However components of passive solar heating are‚ the aperture area of the house‚ absorber area of the house‚ thermal mass of the house‚ heat distribution‚ and solar control. When these components work together it contributes
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more energy in combustion reaction than the less alcoholic hydrocarbons compounds. Equipment: Different types of alcohols in spirit burner (CH4‚ C2H6‚ C3H8‚ C4H10‚ C5H12)‚ Thermometer‚ water‚ beaker‚ scale‚ measuring cylinder‚ tripods‚ clamp‚ gauze‚ heat mat‚ lighter or matches. Hazard: Most of alcohol we using are flammable‚ irritant‚ toxic and harmful. 1 provide spirit burners which have removable glass caps‚ this makes it easier and safer to extinguish the flames. 2 Make sure the wick fits tightly
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creates an isolated system as it acts as a heat insulator between the cup and the surrounding. When a reaction happens bonds are created and destroyed causing energy to be released or absorbed. In a constant pressure‚ like in the coffee cup calorimeter‚ the change in energy equals to the enthalpy change of the reaction. Because enthalpy change of the reaction equals to the specific heat times the mass times the change in temperature‚ the amount of heat released or absorbed can be determined by measuring
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URANIUM TALENT SEARCH EXAMINATION(UTSE) - 2011 (CBSE/ICSE) Time: 60 minutes(11 am - 12 noon) Class- IX F.M - 180(+3/-1 system) Declaration of Result in the internet(www.theuranium.org) : 15.03.2011 (There are 60 MCQs and each has one correct answer. You are required to darken the appropriate circle in the OMR answer sheet with the help of a HB pencil. Eraser can be used to change any answer. Note that improper darkening will make your answer sheet invalid by the computer. 3 marks will be given
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