fau-phy-2049l-practical-exam

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University of South Florida, Tampa *

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2048L

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Physics

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Dec 6, 2023

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pdf

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Studocu is not sponsored or endorsed by any college or university FAU phy 2049l Practical Exam General Physics Lab 2 (Florida Atlantic University) Studocu is not sponsored or endorsed by any college or university FAU phy 2049l Practical Exam General Physics Lab 2 (Florida Atlantic University) Downloaded by Samantha Slut (samraegroupie@gmail.com) lOMoARcPSD|26072243

release energy This is because a liquid has more KE kinetc energy then a solid, and when it changes phases into a solid it has to release that energy. Does a liquid release energy or absorb energy when it changes into a solid? -release energy -absorb energy -Both freezing point and meltng point are the same for a pure substance The meltng and freezing point is the temperature in between the point at which molecules of a substance either gain KE and move apart, or lose KE and gain more molecular bonds. How does the freezing point of a liquid compare with its meltng point? -Freezing point is less than meltng point for a pure substance. -Freezing point is greater than meltng point for a pure substance. -Both freezing point and meltng point are the same for a pure substance. absorb energy The is because the a liquid has a lower kinetc energy than a gas, and to change into a gas it has to absorb energy. Does a liquid release energy or absorb energy when it changes into a gas? -absorb energy -release energy none of these 80 calories is absorbed to melt 1 gram, so to melt 50 grams Downloaded by Samantha Slut (samraegroupie@gmail.com) lOMoARcPSD|26072243

50*80= 4000 cal To melt 50 grams of 0-degree-Celsius ice requires 50 calories. 25 calories. 80 calories. none of these more calories than are required to bring 50 grams of ice at absolute zero to the boiling point. absolute zero is about -273, and it takes 4.187 calories for water to be raised one degree. it takes 373 degree to reach 100 C, 3734.187= 1561.8 Cal* But ... since it take 540 cals to vaporize 1 gram of water 54050= 27,000 cal* To turn 50 grams of boiling water to steam requires -500 calories -more calories than are required to bring 50 grams of ice at absolute zero to the boiling point. -540 calories. -50 calories. -None of the above choices are correct. a transfer of energy Downloaded by Samantha Slut (samraegroupie@gmail.com) lOMoARcPSD|26072243

When a substance goes through a phase change it almost always needs to release energy, or absorb energy. Changes of phase almost always require _______. -electron transfer -a conditon of thermal equilibrium -a transfer of energy -an absence of molecular contact colder Condensaton occurs more in cold air, because molecules slow down, allowing them to bump into each other and form chemical bonds with each other. The inside surface of a glass window becomes wet when the temperature outside is _______. -colder -either warmer or colder -warmer -almost exactly the same as on the inside below the surface and throughout water this occurs when bubbles in the liquid form when the pressure of the vapor inside the bubbles is great enough to resist the pressure of the surrounding liquid. Boiling is evaporaton that mainly occurs _______. -below the surface and throughout water -at the botom of a container of heated water -at the surface of water -when water becomes overly hot pressure is sufciently lowered Downloaded by Samantha Slut (samraegroupie@gmail.com) lOMoARcPSD|26072243

lowered pressure at high alttudes decrease the boiling point of a liquid. boiling depends not only on temperature, but on pressure as well. Boiling can occur in cold water when _______. -concentraton and physics come together -sub-zero temperatures are achieved -pressure is sufciently increased -pressure is sufciently lowered vaporizes In one gram of water it takes 540 cal to take water from a liqid form and vaporize it in to a gas form. It only takes 80 cal to melt it and 100cal to boil Most energy transfer occurs in water when it _______. -vaporizes -melts -increases from its meltng temperature to its boiling temperature -freezes a great variety of speeds. Molecules in liquid water have wide variety of speeds. Some gain KE, while others lose KE The molecules in a room-temperature glass of water jostle around at -a very small range of speeds. -a great variety of speeds. -much the same rates of speed. Downloaded by Samantha Slut (samraegroupie@gmail.com) lOMoARcPSD|26072243

a warming process. When condensaton occurs excess KE, is shared with the liquid, and this increases the liquids temperature. Evaporaton is a cooling process and condensaton is -a warming process. -a cooling process also. -neither a warming nor cooling process. the more energetc molecules are able to escape the liquid. Molecules about to be propelled out of the liquid gain energy, while those that remain in the liquid lose energy. Thus the average kinetc energy of the molecules remaining in the liquid is lowered. Therefore cooling the liquid. Evaporaton is a cooling process because -heat is radiated during the process. -the temperature of the remaining liquid decreases. -of conducton and convecton. -the more energetc molecules are able to escape the liquid. -none of these to help evaporaton occur in its mouth and bronchial tract. Since they have no sweat glands dogs pant, this causes evaporaton to occur in its mouth and bronchial tract. Since evaporaton is a cooling process it cool the dogs of. A hot dog pants -to bring more oxygen into its lungs. -to help evaporaton occur in its mouth and bronchial tract. Downloaded by Samantha Slut (samraegroupie@gmail.com) lOMoARcPSD|26072243

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