Chapter 22 Test Heat Transfer Answers

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• [FREE] Chapter 22 Test Heat Transfer Answers | updated!

  Solar radiation is the same as sunlight. However, sometimes, sunlight can bounce off of a surface and cause or spread heat to something around it. For example, sunlight could bounce off of the ground and angle into a window. The glass of the window...

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• [DOWNLOAD] Chapter 22 Test Heat Transfer Answers | latest!

  Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, as through a cooking pan, or slowly, as through the walls of a picnic ice chest. So many processes involve heat transfer that it is hard to imagine a situation...

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• Chapter 22 Heat Transfer Worksheet Answers

  In a fireplace, heat transfer occurs by all three methods: conduction, convection, and radiation. Radiation is responsible for most of the heat transferred into the room. Heat transfer also occurs through conduction into the room, but much slower. Heat transfer by convection also occurs through cold air entering the room around windows and hot air leaving the room by rising up the chimney. Check Your Understanding Name an example from daily life different from the text for each mechanism of heat transfer.

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• Methods Of Heat Transfer

  Conduction: Heat transfers into your hands as you hold a hot cup of coffee. Conduction As you walk barefoot across the living room carpet in a cold house and then step onto the kitchen tile floor, your feet feel colder on the tile. This result is intriguing, since the carpet and tile floor are both at the same temperature. The different sensation is explained by the different rates of heat transfer: The heat loss is faster for skin in contact with the tiles than with the carpet, so the sensation of cold is more intense. Some materials conduct thermal energy faster than others. Figure shows a material that conducts heat slowly—it is a good thermal insulator, or poor heat conductor—used to reduce heat flow into and out of a house. Insulation is used to limit the conduction of heat from the inside to the outside in winter and from the outside to the inside in summer. If two molecules collide, energy transfers from the high-energy to the low-energy molecule. In a metal, the picture would also include free valence electrons colliding with each other and with atoms, likewise transferring energy.

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• Lab #22.4 Heat: Chapter 22 Canned Heat: Cooling Down

  The cumulative effect of all collisions is a net flux of heat from the hotter body to the colder body. Thus, the rate of heat transfer increases with increasing temperature difference If the temperatures are the same, the net heat transfer rate is zero. Because the number of collisions increases with increasing area, heat conduction is proportional to the cross-sectional area—a second factor in the equation.

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• Shared Flashcard Set

  Molecules in two bodies at different temperatures have different average kinetic energies. Collisions occurring at the contact surface tend to transfer energy from high-temperature regions to low-temperature regions. In this illustration, a molecule in the lower-temperature region right side has low energy before collision, but its energy increases after colliding with a high-energy molecule at the contact surface. In contrast, a molecule in the higher-temperature region left side has high energy before collision, but its energy decreases after colliding with a low-energy molecule at the contact surface. A third quantity that affects the conduction rate is the thickness of the material through which heat transfers. Figure shows a slab of material with a higher temperature on the left than on the right. Heat transfers from the left to the right by a series of molecular collisions. The greater the distance between hot and cold, the more time the material takes to transfer the same amount of heat.

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• Heat Transfer Quiz

  Heat conduction occurs through any material, represented here by a rectangular bar, whether window glass or walrus blubber. All four of these quantities appear in a simple equation deduced from and confirmed by experiments. The rate of conductive heat transfer through a slab of material, such as the one in Figure , is given by where P is the power or rate of heat transfer in watts or in kilocalories per second, A and d are its surface area and thickness, as shown in Figure , is the temperature difference across the slab, and k is the thermal conductivity of the material. Figure gives representative values of thermal conductivity. More generally, we can write where x is the coordinate in the direction of heat flow.

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• Chapter 22: MULTIPLE CHOICE QUESTIONS

  Example: Alums, K2SO4. Al2 SO4 3. Bauxite Al2O3. All minerals are not ores but all ores are minerals. The impurity of sand and rock materials present in the ore is known as gangue. Question 14 Name two metals that are found in nature in the free state. Solution: Gold and platinum are found in the free state in nature. Question 15 What is chemical process used for obtaining a metal from its oxide? Question 16 Name two metals, which can form hydrides with metals. Solution: Sodium and calcium form stable hydrides on reacting with hydrogen. Question 17 Does every mineral have a definite and a fixed composition? Solution: Yes, every mineral has a definite and a fixed composition. These minerals are formed as a result of chemical changes taking place during the formation of earth. Class 10 metals and nonmetals Question 18 Explain the meaning of malleable and ductile. Ductile is being able to be drawn into thin wires. Question 19 i. Write the electron dot structures for sodium, oxygen and magnesium.

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• What Will You Get ?

  Show the formation of MgO and Na2O by the transfer of electrons. What are the ions present in these compounds? Solution: ii. Formation of Magnesium oxide When magnesium reacts with oxygen, the magnesium atom transfers its two outermost electrons to an oxygen atom. Formation of Sodium oxide Two sodium atoms transfer their 2 outermost electrons to an oxygen atom. And by gaining two electrons, the oxygen atom forms an oxide ion O Question 20 You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels. Solution: The sour substances such as lemon or tamarind juice contain acids. These acids dissolve the coating of copper oxide or basic copper carbonate present on the surface of tarnished copper vessels and make them shining red-brown again.

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• Conceptual Physics Practice Page Ch 22

  Question 21 Give an example of a metal which i. Solution: i. Mercury is in liquid state at room temperature. Sodium and potassium are soft metals which can be easily cut with a knife. Silver is the best conductor of electricity. Mercury is a poor conductor of heat. Question 22 Why is sodium kept immersed in kerosene? Solution: Sodium metal is kept immersed in kerosene to prevent their reaction with oxygen, moisture and carbon dioxide of air. Question 23 Why do ionic compounds have high melting points?

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• HC Verma Solutions For Class 11th Physics

  Solution: These compounds are made up of positive and negative ions. There is a strong force of attraction between the oppositively charged ions, so a lot of heat energy is required to break this force of attraction and melt the ionic compounds. This is why ionic compounds have high melting points. Question 24 A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used? Solution: Aqua regia By volume, this contains 3 parts of concentrated hydrochloric acid and 1 part of concentrated nitric acid is the solution, which is used to sparkle the bangles like new, but their weight will be reduced drastically.

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• Chapter 22: States Of Matter

  Question 25 Write equations for the reactions of i iron with water ii calcium and potassium with water Solution: Question 26 What would you observe when zinc is added to a sodium of iron II sulphate? Write the chemical reaction that takes place? Solution: Zinc is more reactive more electro positive than iron. Therefore it displaces iron from its salt solution. The colour of ferrous sulphate is pale green which becomes colourless. Metals and nonmetals class 10 Question 27 Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test-tube over the burning sulphur. What will be the action of this gas on: Dry litmus paper? Write a balanced chemical equation for the reaction taking place. Solution: a When sulphur is brunt in air then sulphur dioxide gas is formed. Metals and nonmetals class 10 Question 2.

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• Class 7 Science Chapter 4 MCQ

  Make a list of examples of energy that you are familiar with. Some have more energy than others. The average kinetic energy of the individual particles is the temperature, an intensive property, of the substance. You can find an average by adding up a group of numbers and dividing the total by the number of items in the group. For example, the average of the numbers 2, 4, 8, and 10 is 2 4 8 10 4 6. Temperature is different from thermal energy because thermal energy is a total and temperature is an average. You know that the iced tea is colder than the hot tea, as shown in Figure 8. Stated differently, the temperature of iced tea is lower than the temperature of hot tea. You also could say that the average kinetic energy of the particles in the iced tea is less than the average kinetic energy of the particles in the hot tea.

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• Chapter 22 Heat Transfer Exercises 22 1 Conduction Answers

  Heat When a warm object is brought near a cooler object, thermal energy will be transferred from the warmer object to the cooler one. The movement of thermal energy from a substance at a higher temperature to one at a lower temperature is called heat. When a substance is heated, it gains thermal energy. Therefore, its particles move faster and its temperature rises. When a substance is cooled, it loses thermal energy, which causes its particles to move more slowly and its temperature to drop. How is heat related to temperature? Specific Heat As you study more science, you will discover that water has many unique properties. One of those is the amount of heat required to increase the temperature of water as compared to most other substances. Substances that have a low specific heat, such as most metals and the sand in Figure 9, heat up and cool down quickly because they require only small amounts of heat to cause their temperatures to rise.

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• Chapter 22 Heat Transfer Worksheet Answers | Free Printables Worksheet

  A substance with a high specific heat, such as the water in Figure 9, heats up and cools down slowly because a much larger quantity of heat is required to cause its temperature to rise or fall by the same amount. Changes Between the Matter can change from one state to another when thermal energy is absorbed or released. This change is known as change of state. The graph in Figure 11 shows the changes in temperature as thermal energy is gradually added to a container of ice. Melting As the ice in Figure 11 is heated, it absorbs thermal energy and its temperature rises. At some point, the temperature stops rising and the ice begins to change into liquid water. The change from the solid state to the liquid state is called melting. The temperature at which a substance changes from a solid to a liquid is called the melting point. Figure 9 The specific heat of water is greater than that of sand. The energy provided by the Sun raises the temperature of the sand much faster than the water.

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• NCERT Solutions For Class 10 Science Chapter 3 Metals And Non-metals

  Figure 10 Rather than melting into a liquid, glass gradually softens. Glass blowers use this characteristic to shape glass into beautiful vases while it is hot. At certain temperatures, water changes from one state to another. This diagram shows what changes occur as water is heated or cooled.

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• Top 10 CHAPTER 22 HEAT TRANSFER EXERCISES 22 1 CONDUCTION ANSWERS On 1medicoguia.com

  Chapter 2: Heat Exchanger Applications Introduction Heat exchangers are found in most chemical or mechanical systems. Some of the more common applications are found in heating, ventilation and air conditioning HVAC systems, radiators on internal combustion engines, boilers, condensers, and as preheaters or coolers in fluid systems. This chapter will review some specific heat exchanger applications.

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• Conceptual Physics Practice Page Ch 22 | Chm Free IPhone Online On 1medicoguia.com

  The intent is to provide several specific examples of how each heat exchanger functions in the system, not to cover every possible application. Preheater In large steam systems, or in any process requiring high temperatures, the input fluid is usually preheated in stages, instead of trying to heat it in one step from ambient to the final temperature. In the case of a steam system, a portion of the process steam is tapped off and used as a heat source to reheat the feedwater in preheater stages. Figure 8 is an example of the construction and internals of a U-tube feedwater heat exchanger found in a large power generation facility in a preheater stage. As the steam enters the heat exchanger and flows over and around the tubes, it transfers its thermal energy and is condensed. Note that the steam enters from the top into the shell side of the heat exchanger, where it not only transfers sensible heat temperature change but also gives up its latent heat of vaporization condenses steam into water.

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• 23 Heat Transfer Quizzes Online, Trivia, Questions & Answers - ProProfs Quizzes

  The condensed steam then exits as a liquid at the bottom of the heat exchanger. The feedwater enters the heat exchanger on the bottom right end and flows into the tubes. Note that most of these tubes will be below the fluid level on the shell side. This means the feedwater is exposed to the condensed steam first and then travels through the tubes and back around to the top right end of the heat exchanger.

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  Figure 8: U-tube Feedwater Heat Exchanger The feedwater is further heated by the hot steam and then exits the heat exchanger. In this type of heat exchanger, the shell side fluid level is very important in determining the efficiency of the heat exchanger, as the shell side fluid level determines the number of tubes exposed to the hot steam. Radiator Commonly, heat exchangers are thought of as liquid-to-liquid devices only. But a heat exchanger is any device that transfers heat from one fluid to another. The most familiar example of an air-toliquid heat exchanger is a car radiator. The coolant flowing in the engine picks up heat from the engine block and carries it to the radiator.

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  From the radiator, the hot coolant flows into the tube side of the radiator heat exchanger. The relatively cool air flowing over the outside of the tubes picks up the heat, reducing the temperature of the coolant. Because air is such a poor conductor of heat, the heat transfer area between the metal of the radiator and the air must be maximized. This is done by using fins on the outside of the tubes. The fins improve the efficiency of a heat exchanger and are commonly found on most liquid-to air heat exchangers and in some high efficiency liquid-to-liquid heat exchangers. Air Conditioner Evaporator and Condenser All air conditioning systems contain at least two heat exchangers, usually called the evaporator and the condenser. In either case, evaporator or condenser, the refrigerant flows into the heat exchanger and transfers heat, either gaining or releasing it to the cooling medium. Commonly, the cooling medium is air or water.

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• Answer Key Chapter 22 - College Physics For AP® Courses | OpenStax

  In the case of the condenser, the hot, high pressure refrigerant gas must be condensed to a subcooled liquid. The condenser accomplishes this by cooling the gas, transferring its heat to either air or water. The cooled gas then condenses into a liquid. In the evaporator, the subcooled refrigerant flows into the heat exchanger, but the heat flow is reversed, with the relatively cool refrigerant absorbing heat from the hotter air flowing on the outside of the tubes. This cools the air and boils the refrigerant. Large Steam System Condensers The steam condenser, shown in Figure 9, is a major component of the steam cycle in power generation facilities. It is a closed space into which the steam exits the turbine and is forced to give up its latent heat of vaporization.

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• Chapter States Of Matter

  It is a necessary component of the steam cycle for two reasons. One, it converts the used steam back into water for return to the steam generator or boiler as feedwater. This lowers the operational cost of the plant by allowing the clean and treated condensate to be reused, and it is far easier to pump a liquid than steam. Because condensation is taking place, the term latent heat of condensation is used instead of latent heat of vaporization. After the steam condenses, the saturated liquid continues to transfer heat to the cooling water as it falls to the bottom of the condenser, or hotwell. This is called subcooling, and a certain amount is desirable. A few degrees subcooling prevents condensate pump cavitation. The difference between the saturation temperature for the existing condenser vacuum and the temperature of the condensate is termed condensate depression. This is expressed as a number of degrees condensate depression or degrees subcooled.

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