unknown liquid‚ the freezing point of t-butyl alcohol‚ the molal freezing point and the molar mass of an unknown can be determined. The equations pertinent to this experiment include the following: mc= ∆Tf=Tf-Tf’=(Kf)(mc) mc= mc= mc= gram molar mass of solute‚ g mole^-1= kf=∆Tf/ mc mass of unknown ‚g=(volume of unknown‚ mL)(density of unknown‚ g mL-1) NaCl(s) + H2O(l) → Na+ (aq) + Cl-(aq) This experiment relates to what is being studied by showing how random error can effect and
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trial 1 ΔTf = -8° C - 0°C = -8°C Ethyl alcohol trial 2 ΔTf = -7° C - 0°C = -7°C 2. ΔTf = Kfm m = ΔTf / = Kf Isopropyl alcohol trial 1 m = ΔTf / = Kf = -11°C / -1.86 °C/m = 5.91 m Isopropyl alcohol trial 2 m = ΔTf / = Kf = -10°C / -1.86 °C/m = 5.38 m Ethyl alcohol trial 1 m = ΔTf / = Kf = -8°C / -1.86 °C/m = 4.30 m Ethyl alcohol trial 2 m = ΔTf / = Kf = -7°C / -1.86 °C/m = 3.76 m 4. kg of solvent = volume of solvent x density of solvent kg of solvent = 10 mL
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in the muscle. Another way to increase the force produced by a muscle is to Your answer : a. slow action potential propagation down the motor neurons that innervate the muscle. Correct answer: d. increase the number of activated motor units. 010/03/13 page 1 Experiment Results Predict Question: Predict Question 1: As the stimulus frequency increases‚ what will happen to the muscle force generated with each successive stimulus? Will there be a limit to this response? Your answer :
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The Kenyan Natural Resource Management project The project location is an area called Cherangany Hills‚ an area covered by rich forest and includes numerous national parks‚ swamps‚ lakes and conservation areas. A large indigenous population known as the Sengwer People‚ also called Cherangany or Dorobo by some are also from this area. This project that was intended for financial and industrial improvement of the native people of Cherangany Hills actually caused a lot of chaos and heartbreak and displacement
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retention‚ in contrast to the multi-store model. It is an optional process rather than the only means by which information is kept in immediate memory. The working memory model also explains many psychological observations. The KF case study supports the Working Memory Model. KF suffered brain damage from a motorcycle accident that damaged his
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Abstract Chemical reactions can be used to produce electricity and electricity can be used to cause chemical reactions through oxidation-reduction reactions. The first part of the experiment measures the standard electrode potentials of five various half cells against the Cu2+(1M)|Cu half cell. The last three half cells are prepared through electrolysis. The electrode potentials of all reactions are positive which means that they are spontaneous. There is a significant percent difference from the
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the beginning of expiration‚ the You correctly answered: a. pressure in the thoracic cavity increases. 5. A tidal volume refers to the You correctly answered: b. amount of air inspired and then expired with each breath under resting conditions. 010/24/12 page 1 Experiment Results Predict Question: Predict Question: Lung diseases are often classified as obstructive or restrictive. An obstructive disease affects airflow‚ and a restrictive disease usually reduces volumes and capacities
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20% Antifreeze | -8.0°C | Calculations Questions: 1. Using the equation ΔT = Kf m‚ calculate the molality of the 10% antifreeze solution. 2. Use the formula molality = moles solute/kg solvent to find the number of moles in 10% antifreeze solution. 3. Using the formula molar mass = grams/moles calculate the molecular mass of antifreeze in the 10% solution. 4. Using the equation ΔT = Kf m¸calculate the molality of the 20% antifreeze solution. 5. Use the formula molality
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application of GD&T. rectangular -shaped tolerance zone. 6. Plus or minus tolerancing generates a 7. GD&T generates a cylindrical-shaped tolerance zone to control an axis. 8. If the distance across a square tolerance zone is ± .005 or a total of .010‚ what is the ± .007 or .014 approximate distance across the diagonal? 9. Bonus tolerance equals the difference between the actual mating envelope size and the maximum material condition 10. While processing‚ a rectangular part usually rests against
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Chloroform has a molar mass of 119.4 g mol-1 and a density of 1.499 g cm-3. Estimate the volume of the above mixture using this information. 3. Calculate the molal freezing point depression constant Kf for 1-octadecanol using: Tf = 57.95 oC‚ Hfus = 74.047 kJ mol-1‚ and M = 270.5 g mol-1. ΔTf = Kf m 4. A polymer chemist dissolves 20.00g of polystyrene in 1.000L of benzene. The solution is found to generate an osmotic pressure of 1.000 kPa at 298.0K. Calculate the average molecular weight
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