25*100/1 = 25% error for the 5 mL pipet = 0.25*100/5 = 5% error for the 10 mL pipet = 0.25*100/10 = 2.5% 2. It is important to make certain that there is no air bubble in the tip of the buret below the stopcock before the initial reading of the liquid level in the buret is taken. If a 0.5-mL air bubble is present in the tip of a buret‚ what percent error in 10-mL‚ 20-mL‚ and 40-mL samples will result if the air bubble is dislodged
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| Chemistry Lab Report | Constructing Heating/Cooling Curve | | Salman Ishaq 12-E | 1/27/2013 | | BACKGROUND As energy flows from a liquid‚ its temperature drops. The entropy‚ or random ordering of its particles‚ also decreases until a specific ordering of the particles results in a phase change to a solid. If energy is being released or absorbed by a substance remaining at the same temperature‚ this is evidence that a dramatic change in entropy‚ such as a phase change‚ is occurring. Because
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evaporation & condensation‚ sublimation and crystallization. Melting or the fusion of ice is endothermic‚ the equation for the fusion of ice is or melting is ∆Hfusion. Solidification goes from a liquid state to a solid state making this an exothermic reaction. Vaporization & condensation is from a liquid to a gas causing an endothermic reaction‚ the equation for liquefying or steam is ∆Hvaporization. Condensation is an exothermic reaction because it goes from a gas to a solid. A state the goes from
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potatoes to the blender with 250 mls of tap water to cover the potatoes and blend on high until the potatoes are pureed (blended to a thick liquid or paste) - place a cheesecloth over a container and use the cheesecloth to obtain the liquid portion (only) of your potato puree. You can squeeze the cheesecloth in the end to obtain the final portions of the liquid from the puree. - Make a 1% sucrose solution using the method describe in your osmosis lab. - Make a 1% salt solution by measuring 1 gram
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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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known as the fixed points. The temperature range that is typically marked on a laboratory thermometer is −10oC to 110oC. Thermometric liquids are those that are used in thermometers. Some examples of such liquids are mercury and alcohol. The thermometric fluid used by Galileo Galilei in his thermometer was air. Alcohol‚ which is used as a thermometric liquid‚ has the following characteristic properties : 1. Alcohol has a very low freezing point of about −112oC and hence is suitable in thermometers
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Celsius‚ so if the temperature is above that then ice will melt. When salt and water are mixed together‚ the salt dissolves‚ which means the salt breaks into small particles that thoroughly mix with the water. A solution made with a liquid solvent is called a liquid
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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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screening principle‚ vortex and filtering as a whole‚ desanding‚ material in the field of water treatment‚ such as solid-liquid separation effect is remarkable. It is Widely used in water source heat pump‚ water treatment‚ food‚ medicine and other industrial sectors. And it also used river water‚ well water‚ sand‚ coal washing water‚ industrial concentration‚ solid-liquid separation‚ liquid degassing and the miscibility of separation. Operating Principle: Cyclone desander is based on the principles
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