compound. Many factors go into the estimation of the boiling point of a liquid such as the shape (round, oval, elongated), the mass and most importantly, hydrogen bonding (H-bonding). Methane with a mass of 16 does not engage in H-bonding and is a gas at room temperature while water (mass 18) boils at 100oC. While we can often guess the relative boiling points of a series of compounds, it is rather difficult to calculate a boiling point based on first principals. Similarly,
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a condenser and is converted to the liquid, which is then collected in a receiver flask. The other components of the mixture remain in their original phase until the most volatile substance has all boiled off. Only then does the temperature of the gas phase rises again until it reaches the boiling point of a second component in the mixture, and so on. There are two types of distillation namely simple distillation and fractional distillation. In this experiment the efficiency of the two types of
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ABSTARCT Determination of boiling point and melting point of the organic liquids, in practice determining the boiling point of ethyl and Isopropyl Alcohol and the melting point of benzoic acid and Urea. However, the boiling point of a liquid is the temperature at which the pressure of the vapor above a liquid equals the existing pressure. As we heat a liquid, the pressure of the vapor above the liquid slowly increases. When this pressure equals the pressure presented in the container, the liquid
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temperature of the catalase increased from 30 to 45 degrees Celsius, the gas/ bubble production would increase while below 40 degrees. Then, I expected the bubbles to decrease once the temperature reached 40 and above. I would now reject that hypothesis because our data showed differently. From the temperature of 30 and 38 degrees, the bubble production was 8.1cm and 8.7cm. So, it did increase below 40 degrees Celsius, but at 45 degrees, the gas production increased more to 11.2 cm. So, it wasn’t correct that
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2013-14 Advanced Environmental Technologies 2013-14 Holly Cross Athletic Facility Decontamination Analysis Cleaning vs. Disinfecting Introduction Cleaning and disinfecting of public transportation is a matter of technique, coupled with the proper cleaning agents. To insure that cross contamination of harmful microbes does not occur, certain steps need to be followed to take cleanliness down to the microscopic level, where the cause of the problem actually originates. Current practices
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Table 1. Advantages and Disadvantages of Various Centrifugal Pumps* | ADVANTAGES | Volute Pumps | Diffuser Pumps | Turbine Pumps | Propeller Pumps | Available in a wide range of sizes | X | X | X | X | Simple construction | X | | | X | Relatively quiet operation | X | X | X | X | Robust with a long life | X | X | | X | Available in a wide variety of materials | X | X | | X | Can handle liquids containing solids | X | X | | X | Can handle liquids with a high proportion of
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ABSTARCT Determination of boiling point and melting point of the organic liquids, in practice determining the boiling point of ethyl and Isopropyl Alcohol and the melting point of benzoic acid and Urea. However, the boiling point of a liquid is the temperature at which the pressure of the vapor above a liquid equals the existing pressure. As we heat a liquid, the pressure of the vapor above the liquid slowly increases. When this pressure equals the pressure presented in the container, the
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: A. Forest and all living things complement each other as forests is important in supplying the needs of life. 1. Forest will produce oxygen and absorb the carbon dioxide. a) Oxygen released by the trees in the forest is the chemical gas that are very important to human and animal life.(Chrisz,2006) b) Trees absorb carbon dioxide in the air and replaced it with clean air to remove toxic gases that facilitate human and animal respiration. 2. Supply various kind of food.
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at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. Calculate the mass of helium added to the cylinder if the volume was changed from 2.50 L to 3.70 L. (Ans: 1.44 g) 2. An ideal gas in a 2.08 L container exerts a pressure of 1.00 atm at 0 °C. Determine the required change in temperature to adjust the pressure of gas to 1.65 atm after it has been transferred to a 1.50 L container. (Ans: 51.88) 3. (a) A 10.73 g sample
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You and your students may be familiar with the observation that colour leaks out of beetroot when it is cooked. Many cookbooks suggest that beetroot should be cooked with their outer skins on, and with a minimum amount trimmed from the top (by the leaves) and tail (by the taproot) to reduce the release of beet colour leaking into the water. This procedure lends itself to detailed evaluation, and provides an opportunity to discuss how you would like students to write up a practical. Cutting the
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