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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appliances and is used in commercial kitchens. Fires involving cooking fats and oils (classified as class K (US) or F (Australia/Europe/Asia)) burn hotter than flammable liquids‚ rendering a standard class B extinguisher ineffective. Flammable liquids have flashpoints under 100 degrees Fahrenheit. Cooking oil is a combustible liquid since it has a flashpoint over 100 degrees. Such fires should be extinguished with a wet chemical extinguisher. Extinguishers of this type are designed to extinguish cooking
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exchange Chromatography Ion exchange chromatography is a process for separating proteins and other molecules in a solution based on differences in net charge. Ion Exchange Chromatography relies on charge-charge interactions between the proteins in your sample and the charges immobilized on the resin of your choice. Ion exchange chromatography can be subdivided into cation exchange chromatography‚ in which positively charged ions bind to a negatively charged resin; and anion exchange chromatography‚ in
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we are immensely interested in solutions‚ especially liquid solutions. Solutions are defined as homogeneous mixtures of pure substances in which no precipitation or settling occurs. We often think of solutions as liquids‚ but we can have solutions of solids (alloys)‚ gases (air is a solution of nitrogen‚ oxygen‚ carbon dioxide‚ and a number of other gases)‚ and a combination of states such as liquid and solid metals (amalgams) and liquids and gases (nitrogen in the blood‚ carbonated beverages)
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negative oxygen is attracted to the positive parts * “Like dissolves like” – describes whether one substance will dissolve in another. Water for example can’t dissolve nonpolar substances Concentrations on Solutions * Solvent: The liquid in which a solute is dissolved to form a solution. * Solute: The minor component in a solution‚ dissolved in the solvent. * The ratio of the amount of solute versus the amount of solvent is the concentration of the solution. * Solutions
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