Surface chemistry Questions

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Calculate the osmotic pressure of a solution containing 23.1 g of glycerin (C3H8O₂) in 261.0 mL of solution at 290 K. Express your answer in atmospheres to three significant figures.

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are anti-inflammatory. Question 7 (1 point) Micelles consist of milk proteins and other molecules suspended in water. a soluble form of vitamin D. aggregates of alcohol molecules. None of these responses is correct. a broken-down form of vitamin D. water-soluble fat molecules. Question 8 (1 point)

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that pair n pair n 23. Most sulfur oxides resulting from combustion (fill in blank) (a) come from sulfur in the air (b) come from sulfur in the fuel ds is Hisa er in pH = 24. Which is the largest source of sulfur oxide pollution? (©) burning home heating oil (d) buring coal for power plants (c) burning natural gas for home heating ".0) 3) the acid cases

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Question 8 Ceramic material made by the sol-gel process involve the reaction of a. water and acids. b. ethanol and water. C. water and metal oxides. d. acids and metal alkoxides. e. water and metal alkoxides. OA OB Oc

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Problem 13.87 27 of 28 A Review | Constants 1 Periodic Table Part A An "emulsifying agent" is a compound that helps stabilize a hydrophobic colloid in a hydrophilic solvent (or a hydrophilic colloid in a hydrophobic solvent) Which of the following choices is the best emulsifying agent? OCH(CH2)11 COONa CH3COOH CH3CH2CH2COOH CH(CH2)11 COOH Submit Request Answer Next > Provide Feedback

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N N H N N H H Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru Ru The diagram above illustrates how the reaction N (9) + 3 H2(9) + 2 NH3 (9) occurs on the surface of Ru (s). The rate of this reaction is determined by the amount of energy required to break the bond in N,. This bond is weakened when N, is adsorbed on Ru (8). Based on this information, which of the following provides the best reason for the use of Ru (8) for the synthesis of NH, ? It promotes the proper orientation of N and H atoms to form new N-H bonds. B It provides a reaction path with a lower activation energy. C It forms a bond between Ru and N that is stronger than the bond in N2. D It decreases the frequency of collisions between N2(9) and H2(9).

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Data Table for Diffusion without a membrane: KMnO4 and Methylene Blue KMnO4 MW: Time Diameter in mm Radius in mm Rate mm/min 2 min 22 47 4 min 6 min 22 2 = 1 47 -2 =23.5 58-2=29 69+2 = 34.5 82 +2 = 41 8 min 69 82 10 min

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The average adult heart pumps about 84. mL/s of blood at 72 beats per minute. Suppose you need to calculate how long it would take the average heart to circulate 1800. mL of blood. Set the math up. But don't do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols. time alo Ox10 AN 0.0 : X ?

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Temperature and Energy Activity Name Date Learning Objectives: Be able to describe the relationship between energy and temperature. Be able to describe in words and pictures how energy is transferred between two objects at different temperatures and explain when and why this process stops. Be able to plan an investigation to produce data to support a model of how the system of a hot object and a cold object will change with time. PhET Energy forms and changes available at: https://phet.colorado.edu/en/simulation/energy-forms-and-changes 1) In the boxes below, draw the model given in the simulation and draw a model of the molecules in an object when the object is cold (left) and when the object is hot (right). Assume that the object in both pictures is the same object just at different temperatures. Cold Object Energy Model from sim Hot Object Energy Model from sim Hot Object Molecules Cold Object Molecules 2) At the molecular level, what form of energy do the molecules have? 3) Heat up the brick and the iron to the same temperature. What differences do you notice? Iron Brick 4) What does temperature measure? Support your answer with evidence from the sim.

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1 point Below is a photograph of a pot of distilled water being heated to 1000C. choose your answer... air water oxygen What substance are the bubbles composed of as t hydrogen The bubbles in the picture are composed of choose your answer... vapor particles

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The pressure above a pure sample of solid Substance X at -185. °C is lowered. At what pressure will the sample sublime? Use the phase diagram of X below to find your answer. solid pressure (atm) t liquid gas 200 400 temperature (K) Note: your answer must be within 0.25 atm of the exact answer to be graded correct. atm x ?

Physical Chemistry

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The pressure above a pure sample of solid Substance X at -185. °C is lowered. At what pressure will the sample sublime? Use the phase diagram of X below to find your answer. solid pressure (atm) liquid gas 0 0 200 400 temperature (K) Note: your answer must be within 0.25 atm of the exact answer to be graded correct. atm x ?