4. The Marangoni effect is the tendency of a material to move from a region of low surface tension to a region of high surface tension. Using your chemical knowledge, explain how the surfactant changed surface tension to propel your boat forward. Because we added soap to the bottom of our clip, the surface tension was low in that area only, causing it to move to another spot because...

3-The phase diagram below is for a pure substance. Explain what is wrong with phase diagram a

(2) Sublimation. Figures below represent the phase diagrams for water and carbon dioxide. (a) Describe the difference in sublimation behavior under the pressure and temperature conditions prevailing on Earth. (b) How would you explain the sublimation of the polar ice caps on Mars during the Martian Summer? 217.7 METING FREZING Normal melting point Solid -Normal boiling point Liquid VAPOURISON COKDENSATION Gas 0.006 SUBLIMATION DEPOSITION 100 374.4 Temperature ("C) Pressure (atm)

Which polymer would you expect to have a higher viscosity at room temperature: isotactic-polypropylene (i-PP) or atactic-polypropylene (a-PP)? Explain and support your answer in your own words.

The temperature of 1.9 kg of water is 100.0°C, but the water is not boiling, because the external pressure acting on the water surface is 3.0 x 105 Pa. Using the vapor pressure curve for water given in the figure, determine the amount of heat that must be added to the water to bring it to the point where it just begins to boil. Pressure, Pa 4 x 105 3 x 105 2 x 105- 1.01 x 105 0.53 x 105 0 50 50 83 100 Temperature, C 100 °C 150 1.01 x 105 Pa 83 C 0.53 x 105 Pa

On cold nights, orange grower may run irrigation water and fans to keep their oranges from freezing. Explain these practices.   2. Walking barefoot along the river on a hot summer day, it may be more comfortable to walk on the rocks rather than the dry sand. Why is the rock surface cooler?   3.Why do you feel hotter when the relative humidity is high?

Please answer asap and in short