Boiling Point Elevation 4-4 Boiling Point Elevation If you dissolve a substance such as ordinary table salt (NaCl) in water‚ the boiling point of the water will increase relative to the boiling point of the pure water. In this assignment‚ you will dissolve a sample of NaCl in water and then measure the boiling point elevation for the solution. 1. Start Virtual ChemLab and select Boiling Point Elevation from the list of assignments. The lab will open in the Calorimetry laboratory with a calorimeter
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the initial direction shown in the figure. At t = 7?? 6?? ‚ the key is switched from B to D. Now onwards only A and D are connected. A total charge Q flows from the battery to charge the capacitor fully. If C=20µF‚ R= 10 Ω and the battery is ideal with emf of 50V‚ identify the correct statement (s). B D A 50 V C=20 µF R=10 Ω (A) Magnitude of the maximum (B) The current (C) 7?? charge on the capacitor before ?? = 6?? is 1 × 10−3 C. 7?? in the left part of the circuit just before ?? = 6
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The kinetic theory of gases describes a gas as a large number of small particles (atoms or molecules)‚ all of which are in constant‚ random motion. The rapidly moving particles constantly collide with each other and with the walls of the container. Kinetic theory explains macroscopic properties of gases‚ such as pressure‚ temperature‚ or volume‚ by considering their molecular composition and motion. Essentially‚ the theory posits that pressure is due not to static repulsion between molecules‚ as
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Does the temperature outside affect how fast molecules move inside objects? Charles Law helps us understand how molecules move in different temperatures. It states that increasing the temperature of a constant pressure volume of gas causes individual gas molecules to move faster (Andrew Staroscik Staroscik 9/19/16)‚ and the volume is proportional to the absolute temperature of a gas at (Todd Helmenstine 10/16/16). Therefore‚ as the temperature increases‚ so does the speed of the molecules‚ and when
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Effusion: escape of gas from a container to a region of vacuum Gas Pressure P= Force/area Force: Newton or kg x m/s2 Pressure: Pascal or N/m2 Standard atm pressure P= hdg H: height‚ d: density; g: 9.80665 m/s2 1 atm* = 101‚325 Pa = 760 mmHg* = 760 torr* = 1.01325 bar = 14.7 psi barometer: measure atmospheric pressure Monometer: measure pressures other then atm pressure Gas Laws Boyles law: P at constatnt T is iversely prop to V P1V1=P2V2 EX:Calculate the volume of a sample of gas at 5.75 atm if
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Abstract Molar volume is the volume that one mole of gas occupies when temperature and pressure are kept constant. The molar volume of a gas can be determined through evaluating how much gas is given off when the number of moles of the substance is known. To find the volume of gas that will be used to calculate the molar volume‚ the process of water displacement can be used. Reference Citation Cesa‚ J. (2002). ChemTopic labs: Experiments and demonstrations in chemistry (vol. 9). Batavia
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| |This report discusses an experiment to study the relationship of temperature and pressure of an ideal gas (air) that was heated in a closed | |container. Because the ideal gas was in a closed container‚ its volume remained constant. The objective of the experiment is to test whether the | |ideal equation of state holds. In the equation‚ | |pV
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theory to explain the following: i)Matter can exist in three states ii)The pressure exerted by a confined gas decreases as its temperature is lowered iii)A gas of low molecular mass will diffuse through air faster than a gas of high molecular masseven though both are at same temperature. The Kinetic Theory can be used to describe the three physical states of matter namely‚ solid‚ liquid and gas. In this theory‚ some basic assumptions has to be made: a) all matter is made up of extremely small particles
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Place thermometer in tray 4. Record pressure of Mercury 5. Record temperature of water in tray 6. Weigh your dried lighter before the procedure and after the procedure and record the butane gas lost 7. Record collected volume of butane by releasing into graduated cylinder 8. Test the gas by removing the cylinder from the water and inserting a lit splint inside of the cylinder. 9. Rinse all materials Results When the lab was performed‚ the pressure was 762.5 millimeters
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Focus On Concepts Section 15.3 The First Law of Thermodynamics 1. The first law of thermodynamics states that the change U in the internal energy of a system is given by U = Q - W‚ where Q is the heat and W is the work. Both Q and W can be positive or negative numbers. Q is a positive number if ________‚ and W is a positive number if ________. (a) the system loses heat; work is done by the system (b) the system loses heat; work is done on the system (c) the system gains heat; work is done by
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