P16 - Professor: Daniel Thurs PDF

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Professor: Daniel Thurs...

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The calories needed to change 10 grams of ice at 0°C to steam at 100°C is 7200 Compared with sea-level cooking, in cooking eggs by boiling in mountain regions you should boil the eggs for a longer time. To turn 1 gram of boiling water to steam requires more energy than needed to turn 1 gram of absolute-zero ice to the boiling point. Increased air pressure on the surface of hot water tends to prevent boiling. If bits of the coals do not stick to your feet while walking barefoot on red-hot coals, it would be best if your feet are wet When a gas is changed to a liquid, the gas releases energy When heat is added to boiling water, its temperature remains unchanged A canteen that is wet on the outside results in water inside that is cooler Water can be brought to a boil by both of these What occurs in a pan of water placed outdoors on a warm day? both of these For increased atmospheric pressure, the boiling point of water rises To melt 50 grams of 0-degree-Celsius ice requires none of the above When steam condenses, the surrounding air is warmed Melting snow tends to cool the surrounding air

As a block of ice at 0°C melts, the block absorbs energy without a temperature change Evaporation is a cooling process and condensation is a warming process When condensation occurs inside your bedroom window, the air outside is appreciably colder When water vapor changes phase to become water in a cloud, the surroundings become warmer When water vapor condenses on the inside of a window, the room becomes slightly warmer When water freezes, the surrounding air is warmed Which will melt more ice when placed on its surface, a kilogram of wood or a kilogram of iron of the same high temperature? 1 kg of wood The molecules in a room-temperature glass of water jostle around at a great variety of speeds When a solid melts, energy is absorbed by the solid A boy scout will be burned more severely by 100 g of steam at 100°C When a solid is changed to a liquid, the solid absorbs energy. The reason that evaporation is a cooling process is the more energetic molecules escape the liquid. The most responsible factor for whether a substance takes the phase of solid, liquid, gas, or plasma is its temperature. the temperature at which water freezes is the same as the temperature at which ice melts

When vapor transforms to a plasma, energy must be absorbed by the vapor....