Name: Soo Jin Park Date: 02/20/15 Exp 5: Liquids and Solids Lab Section: 73427 Data Table: Boiling Point Trial 1 Trial 2 Trial 3 Temperature when the last bubble has emerged __86.5˚C _89.4_˚C 87.6_˚C Average temperature from all three trials 87.8˚C % error __6.55_% Melting Point Trial 1 Trial 2 Trial 3 Temperature when the acetamide melts _85.7_˚C 89.5__˚C 87.4_˚C Average temperature from all three trials __87.5˚C % error __8.07__%
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Abstract: This experiment consisted of the separation of sodium chloride and silica. The mixture was separated by extracting the sodium chloride with water and drying both substances. Adding water to the mixture‚ stirring‚ then decanting the resulting liquid twice extracts the dissolved sodium chloride from the silica. Heating both sodium chloride and silica separately provides the mass of each. The data from this experiment can be used to calculate the percent composition of sodium chloride and silica
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Hi‚ my name is water molecule! H2O for short. I live in the bottom of a well. I come from 2 hydrogen atoms‚ but I have an oxygen atom in me! Down here in my well‚ we have a swell time together. In our liquid state‚ we are not too far apart‚ nor too packed together. It’s really great being a liquid! I feel bad for my cousin CO2. He is probably sublimating into a gas from a solid‚ or as a gas‚ freezing back into a solid. He has no melting point‚ only a freezing and boiling point. I’m SO glad I will
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able to: Define Fluid State differences between solid and fluid Calculate common fluid properties: i. Mass density ii. Specific weight iii. Relative density iv. Dynamic viscosity v. Kinematic viscosity INTRODUCTION Fluid Mechanics Gas Liquids Statics i F 0 F 0 i Laminar/ Turbulent Dynamics ‚ Flows Compressible/ Incompressible Air‚ He‚ Ar‚ N2‚ etc. Water‚ Oils‚ Alcohols‚ etc. Stability Pressure Buoyancy Surface Tension Compressibility Density Viscosity Vapor
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It’s calculated by dividing the mass of the object by the volume. The average density of an object can determine if it’ll sink or float when submerged in liquid. The average density for water is 1.0g/ml. and if an object with the average density greater than 1.0g/ml‚ then it’ll sink. Vice versa‚ if the density is less than 1.0g/ml‚ it’ll float. For this particular experiment‚ when the bottle is squeezed‚
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1 m P = Po + Dgh Where Po= atmospheric pressure = 1 atm = 101.3 * 10 ^ 3Pa D = mercury = 13600 kg / m^ 3Plug the values weget P = ( 101.3 * 10^ 3 Pa) + (13328 Pa) = 114628 Pa (101325 Pa - 13328 Pa)=8.8*10^4 A 1.2-m-diameter vat of liquid is 2.4 deep. The pressure at the bottom of the vat is1.2 . What
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Effect of Temperature on Polymers: Solids on heating eventually melt to form a liquid. With polymers it is not so simple rubber on cooling (in liquid nitrogen) becomes brittle or glassy. Many polymers have a mixture of ordered (crystalline) regions and random (amorphous) regions. In the glassy state‚ the tangled chains in the amorphous region are frozen so movement of chains is not possible the polymer is brittle. If the glassy material is heated‚ the chains reach a temperature at which they
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impurities‚ dislocations‚ ect. Homogenous nucleation: solidification of a pure material‚ assume nuceli of solid phase form in the interior of the liquid phase. There are two contributions to the total free energy change ΔG that accompany a solidification transformation 1. The volume free energy ΔGv – which is the difference in free energy between the solid and liquid phases. ΔGv will be negative if the temperature is below the equilibrium solidification temperature. The magnitude of its contribution is
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on the Winkelmann’s method. In this method‚ the volatile liquid is allowed to evaporate in a vertical glass tube over the top of which a stream of vapour-free gas is passed. A water bath is provided for maintaining a steady temperature so that there is no eddy current in the vertical tube and mass transfer takes place from the surface by molecular diffusion alone. By monitoring the evaporation rate‚ which is the rate of fall of liquid surface‚ and with the knowledge of concentration gradient‚
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Chloroform is a liquid with a sticky sweet odor that was once used as an surgical anesthetic. If the density of chloroform is 1.49g/cm3‚ what is the volume of 25g of chloroform? 6. The density of copper is 8.96g/cm3. If a rectangular sheet of copper is 10.3cm wide‚ 46.1cm long‚ and 0.14cm thick‚ what is the mass of the copper? 7. Mercury is a liquid at room temperature with a density of 13.6g/cm3. Would a bar of aluminum float or sink in a pool of liquid mercury
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