蒸发和沸腾习题

蒸发和沸腾习题 romoting the construction of rule of law, but also the most basic development environment. Despite my good social order in General, but there are law-abiding consciousness, social order is not standard, regardless of faith, Twining visit visit and other outstanding problems. We want to actively promote the field of multi-level governance according to law, promote the continuous improvement of the social environment. To promote universal compliance. Actively foster the rule of law culture, carry out law publicity and education on honesty and trustworthiness, guide the masses and consciously abide by the law, failing to find method, problem-solving method, method of gradually changing the world, he is not looking for but someone "unspoken rules", formed all law law, abide by the good atmosphere. To strengthen the comprehensive management of public security. Deepening peace xingan construction, strongly against violence crime, mafia and serious criminal offences, to protect the legitimate rights and interests of citizens, legal persons, carry out criminal policy of temper justice with mercy, the maximum stimulating social vitality, and earnestly safeguard social harmony and stability. To resolve social conflicts by law. To further smooth channels of reporting social conditions and public opinion, improving regulation, arbitration, as well 蒸发和沸腾 一、知识回顾 1、沸腾【重点】 (1)沸腾现象:例-如水沸腾，有大量的气泡上升、气泡变大，到水面破裂，释放出水蒸气。 (2)沸腾规律:液体在沸腾时，要不断地吸热，但温度保持在沸点不变。 (3)液体沸腾必要条件:温度达到沸点、不断吸热。 2、蒸发【重点】 (1)蒸发现象 ?湿衣服放在户外，很快就会干; ?教室洒过水后，水很快就干了; (2)蒸发吸热，有致冷作用 ?刚从水中出来，感觉特别冷(风加快了身上水的蒸发，蒸发吸热)。 ?一杯400C的酒精，敞口不断蒸发，留在杯中的酒精温度低于400C(蒸发要向周围环境和液体自身吸热)。 ?在室内，将一支温度计从酒精中抽出，示数会先下降再升高(酒精蒸发吸热，使温度计中液体温度下降，蒸发结束后温度回升到室温)。 romoting the construction of rule of law, but also the most basic development environment. Despite my good social order in General, but there are law-abiding consciousness, social order is not standard, regardless of faith, Twining visit visit and other outstanding problems. We want to actively promote the field of multi-level governance according to law, promote the continuous improvement of the social environment. To promote universal compliance. Actively foster the rule of law culture, carry out law publicity and education on honesty and trustworthiness, guide the masses and consciously abide by the law, failing to find method, problem-solving method, method of gradually changing the world, he is not looking for but someone "unspoken rules", formed all law law, abide by the good atmosphere. To strengthen the comprehensive management of public security. Deepening peace xingan construction, strongly against violence crime, mafia and serious criminal offences, to protect the legitimate rights and interests of citizens, legal persons, carry out criminal policy of temper justice with mercy, the maximum stimulating social vitality, and earnestly safeguard social harmony and stability. To resolve social conflicts by law. To further smooth channels of reporting social conditions and public opinion, improving regulation, arbitration, as well romoting the construction of rule of law, but also the most basic development environment. Despite my good social order in General, but there are law-abiding consciousness, social order is not standard, regardless of faith, Twining visit visit and other outstanding problems. We want to actively promote the field of multi-level governance according to law, promote the continuous improvement of the social environment. To promote universal compliance. Actively foster the rule of law culture, carry out law publicity and education on honesty and trustworthiness, guide the masses and consciously abide by the law, failing to find method, problem-solving method, method of gradually changing the world, he is not looking for but someone "unspoken rules", formed all law law, abide by the good atmosphere. To strengthen the comprehensive management of public security. Deepening peace xingan construction, strongly against violence crime, mafia and serious criminal offences, to protect the legitimate rights and interests of citizens, legal persons, carry out criminal policy of temper justice with mercy, the maximum stimulating social vitality, and earnestly safeguard social harmony and stability. To resolve social conflicts by law. To further smooth channels of reporting social conditions and public opinion, improving regulation, arbitration, as well (3)影响蒸发快慢的三个因素 ?液体自身的温度高低; ?液体蒸发的面积大小; ?液体表面附近的空气流动速度。 3、蒸发与沸腾。 汽化的两种方式一是蒸发，二是沸腾。它们虽同属汽化，需要吸热，但其特点是不同的。见表中所列: 说明: (1)液体蒸发时，要从周围的物体吸收热量，因此液体温度降低并且有致冷作用。 (2)不同的液体沸点(沸腾时的温度)不同，同种液体的沸点还要随液面上方气压的大小而变化。气压高，沸点高;气压低，沸点低。 (3)液体沸腾时，需要吸热，但其自身的温度保持不变。 二、典型例题 例1:小刚同学物理课上学习了关于“液体沸腾”的知识后(一次看见妈妈蒸馒头的水沸腾后，小刚建议妈妈改用“小火”(针对这种做法，下列说法中正确的是( ) A(水沸腾后，改用“小火”馒头立刻就变熟 as dispute resolution mechanisms, implement fully the petitioners ' cases "third-party" hearings and supervising system of letters and calls, and to resolve the involved law lawsuit into the orbit of rule of law, vexatious, Twining visit visit, disturbing social order and other malicious extortion, resolutely crack down. Five, improving cadres Vitale, provide strong protection for forest development XI General Secretary stressed that the comprehensive revitalization in Northeast China, needs a high quality, solid style, cadres of the dare to play. Cadre cadres is a pledge, should want to do work and able to do good, enthusiasm is paramount. Treat party cadres, it is necessary to Strict management, and warm care, enable the broad masses of cadres work hard work, this is two parallel principles. In strict accordance with the standards of good cadres selection and appointment, the real officers, dare officers, those who want to play, good as excellent cadres at all levels of leadership in the past. At present, some leading cadres work initiative is not high, beyond political, idle, lazy governance governance, not as, slow, messy and a phenomenon still exist to varying degrees, affected and restricted economic and social development. We must mobilize the enthusiasm of cadres as an urgent task, adhere to combination of incentives and constraints, and adhere to the strict management and warm care, practical solution "for the officers not to" problem, motivate cadres and better lead the masses to an undertaking, the cadres and create the new achievement in a dare to play, good at shows as new. To identify the problem, accurate pulse. All things reflected all cadres "for the officers not to" there are 3 main romoting the construction of rule of law, but also the most basic development environment. Despite my good social order in General, but there are law-abiding consciousness, social order is not standard, regardless of faith, Twining visit visit and other outstanding problems. We want to actively promote the field of multi-level governance according to law, promote the continuous improvement of the social environment. To promote universal compliance. Actively foster the rule of law culture, carry out law publicity and education on honesty and trustworthiness, guide the masses and consciously abide by the law, failing to find method, problem-solving method, method of gradually changing the world, he is not looking for but someone "unspoken rules", formed all law law, abide by the good atmosphere. To strengthen the comprehensive management of public security. Deepening peace xingan construction, strongly against violence crime, mafia and serious criminal offences, to protect the legitimate rights and interests of citizens, legal persons, carry out criminal policy of temper justice with mercy, the maximum stimulating social vitality, and earnestly safeguard social harmony and stability. To resolve social conflicts by law. To further smooth channels of reporting social conditions and public opinion, improving regulation, arbitration, as well B(改用“小火”可以提高水的沸点 C(用“大火”可以提高水的沸点，不应该改用“小火” D(无论使用“大火”还是“小火”，水达到沸点后温度都保持不变 分析:液体沸腾有两个必要条件:(1)达到沸点，(2)继续吸热;当两个条件同时具备时即可沸腾( 解答:水沸腾需要两个必要条件:(1)达到沸点，(2)继续吸热;妈妈蒸馒头开锅时，达到沸点;为了使馒头蒸熟，需要继续加热，但无论使用“大火”还是“小火”，水达到沸点后、温度都保持不变( 故选D( ——————————————————————————————————————————————————————— 例2:在一标准大气压下，将温度计浸在盛水的烧杯中，用酒精灯对烧杯加热，直至水沸腾后看到水量明显减少，在这个过程中温度计的示数( ) A(一直增加 B(一直不变 C(先增加后保持不变 D(最高温度达到100? 分析:液体沸腾时要继续吸热，但温度保持不变，这个不变的温度叫做沸点( 解答:液体在沸腾时，需要不断吸热，所以要对烧杯不断加热，在此过程中，液化不断汽化，由液体变为气体，所以液体的质量减小，但温度要保持不变，这个不变的温度就是这种液体的沸点( 故选B( ——————————————————————————————————————————————————————— 例3:在温度计玻璃泡外包一层蘸有酒精的棉花，则温度计的示数将( ) A(一直升高，直至稳定 B(一直降低，直至稳定 C(先升高后降低，直至稳定 D(先降低后升高，直至稳定 分析:熔化、汽化、升华吸热(凝固、液化、凝华放热(汽化的两种方式是蒸发和沸腾(酒精蒸发是吸热的( romoting the construction of rule of law, but also the most basic development environment. Despite my good social order in General, but there are law-abiding consciousness, social order is not standard, regardless of faith, Twining visit visit and other outstanding problems. We want to actively promote the field of multi-level governance according to law, promote the continuous improvement of the social environment. To promote universal compliance. Actively foster the rule of law culture, carry out law publicity and education on honesty and trustworthiness, guide the masses and consciously abide by the law, failing to find method, problem-solving method, method of gradually changing the world, he is not looking for but someone "unspoken rules", formed all law law, abide by the good atmosphere. To strengthen the comprehensive management of public security. Deepening peace xingan construction, strongly against violence crime, mafia and serious criminal offences, to protect the legitimate rights and interests of citizens, legal persons, carry out criminal policy of temper justice with mercy, the maximum stimulating social vitality, and earnestly safeguard social harmony and stability. To resolve social conflicts by law. To further smooth channels of reporting social conditions and public opinion, improving regulation, arbitration, as well romoting the construction of rule of law, but also the most basic development environment. Despite my good social order in General, but there are law-abiding consciousness, social order is not standard, regardless of faith, Twining visit visit and other outstanding problems. We want to actively promote the field of multi-level governance according to law, promote the continuous improvement of the social environment. To promote universal compliance. Actively foster the rule of law culture, carry out law publicity and education on honesty and trustworthiness, guide the masses and consciously abide by the law, failing to find method, problem-solving method, method of gradually changing the world, he is not looking for but someone "unspoken rules", formed all law law, abide by the good atmosphere. To strengthen the comprehensive management of public security. Deepening peace xingan construction, strongly against violence crime, mafia and serious criminal offences, to protect the legitimate rights and interests of citizens, legal persons, carry out criminal policy of temper justice with mercy, the maximum stimulating social vitality, and earnestly safeguard social harmony and stability. To resolve social conflicts by law. To further smooth channels of reporting social conditions and public opinion, improving regulation, arbitration, as well 解答:在温度计玻璃泡外包一层蘸有酒精的棉花，酒精蒸发时，吸收热量，导致温度计的示数降低，当酒精蒸发完毕，温度计的示数升高，直到稳定( 故选D( ——————————————————————————————————————————————————————— 例4:下列说法中正确的是( ) A(固体在熔化过程中温度一定不变 B(-10?的酒精也能蒸发 C(蒸发和沸腾都需要在一定温度下进行 D(夏天扇电风扇，人觉得凉快，是因为电风扇使人周围的空气温度降低 分析:固体分为晶体和非晶体，非晶体在熔化过程中温度变化，沸腾需要在一定温度下进行，但蒸发可以在任何温度下进行，扇电风扇时，电风扇可以使人体表面的汗液蒸发加快，蒸发时可以从身上吸收热量，所以感觉凉快( 解答:A、晶体在熔化过程中温度一定不变，但非晶体在熔化过程中温度改变，不符合题意; B、蒸发可以在任何温度下进行，所以-10?的酒精也能蒸发，符合题意; C、蒸发可以在任何温度下进行，沸腾需要在一定温度下进行，不符合题意; D、夏天扇电风扇，人觉得凉快，是因为电风扇可以使人体表面蒸发加快，蒸发时可以从身上吸收热量，所以感觉凉快，不符合题意; 故选B( ——————————————————————————————————————————————————————— 例5:启电风扇，对着一盆O?水的水面吹风(过了一段时间( ) A(水的表面出现薄冰，温度降到0?以下 B(水的表面出现薄冰，温度仍为0? C(水不会结冰(温度也保持O?不变 D(水不会结冰，as dispute resolution mechanisms, implement fully the petitioners ' cases "third-party" hearings and supervising system of letters and calls, and to resolve the involved law lawsuit into the orbit of rule of law, vexatious, Twining visit visit, disturbing social order and other malicious extortion, resolutely crack down. Five, improving cadres Vitale, provide strong protection for forest development XI General Secretary stressed that the comprehensive revitalization in Northeast China, needs a high quality, solid style, cadres of the dare to play. Cadre cadres is a pledge, should want to do work and able to do good, enthusiasm is paramount. Treat party cadres, it is necessary to Strict management, and warm care, enable the broad masses of cadres work hard work, this is two parallel principles. In strict accordance with the standards of good cadres selection and appointment, the real officers, dare officers, those who want to play, good as excellent cadres at all levels of leadership in the past. At present, some leading cadres work initiative is not high, beyond political, idle, lazy governance governance, not as, slow, messy and a phenomenon still exist to varying degrees, affected and restricted economic and social development. We must mobilize the enthusiasm of cadres as an urgent task, adhere to combination of incentives and constraints, and adhere to the strict management and warm care, practical solution "for the officers not to" problem, motivate cadres and better lead the masses to an undertaking, the cadres and create the new achievement in a dare to play, good at shows as new. To identify the problem, accurate pulse. All things reflected all cadres "for the officers not to" there are 3 main romoting the construction of rule of law, but also the most basic development environment. Despite my good social order in General, but there are law-abiding consciousness, social order is not standard, regardless of faith, Twining visit visit and other outstanding problems. We want to actively promote the field of multi-level governance according to law, promote the continuous improvement of the social environment. To promote universal compliance. Actively foster the rule of law culture, carry out law publicity and education on honesty and trustworthiness, guide the masses and consciously abide by the law, failing to find method, problem-solving method, method of gradually changing the world, he is not looking for but someone "unspoken rules", formed all law law, abide by the good atmosphere. To strengthen the comprehensive management of public security. Deepening peace xingan construction, strongly against violence crime, mafia and serious criminal offences, to protect the legitimate rights and interests of citizens, legal persons, carry out criminal policy of temper justice with mercy, the maximum stimulating social vitality, and earnestly safeguard social harmony and stability. To resolve social conflicts by law. To further smooth channels of reporting social conditions and public opinion, improving regulation, arbitration, as well 但温度要下降 分析:电风扇对着一盆O?水的水面吹风加快了空气的流动，会加快水的蒸发，则利用蒸发吸热和水的凝固特点解释( 解答:当电风扇对着0?水面吹风时，水面的空气流动加快，从而使水面蒸发加快，而蒸发要带走热量，使O?的水因放热而凝固，从而出现薄冰(但由于冰是晶体，则水在凝固过程中放热而温度不变，因此它的温度仍是0?( 故选B ——————————————————————————————————————————————————————— 例6:(2010?义乌市)下列关于蒸发和沸腾的说法正确的是( ) A(蒸发和沸腾都需要从外界吸收热量 B(蒸发和沸腾都可以在任何温度下进行 C(蒸发和沸腾都属于液化现象 D(蒸发的快慢与温度无关，沸腾时温度保持不变 分析:蒸发和沸腾都是汽化现象，都需要从外界吸收热量;但蒸发和沸腾是两种不同的汽化现象，满足的条件是不同的，蒸发可在任何温度下进行，沸腾需要在特定的温度下才会发生;影响蒸发快慢的因素有:液体的温度、液体的表面积、液体表面的空气流动速度等;沸腾过程中的规律是虽然继续吸热但温度保持不变( 解答:A、蒸发和沸腾都是汽化现象，汽化过程都需要从外界吸收热量，故A正确; B、蒸发可在任何温度下进行，沸腾则需要在特定的温度下才会发生，故B错误; C、蒸发和沸腾属于两种不同的汽化现象，故C错误; D、影响蒸发快慢的因素之一是液体的温度，而且沸腾过程虽然继续吸热但温度保持不变，故D错误( 故选A( ——————————————————————————————————————————————————————— romoting the construction of rule of law, but also the most basic development environment. Despite my good social order in General, but there are law-abiding consciousness, social order is not standard, regardless of faith, Twining visit visit and other outstanding problems. We want to actively promote the field of multi-level governance according to law, promote the continuous improvement of the social environment. To promote universal compliance. Actively foster the rule of law culture, carry out law publicity and education on honesty and trustworthiness, guide the masses and consciously abide by the law, failing to find method, problem-solving method, method of gradually changing the world, he is not looking for but someone "unspoken rules", formed all law law, abide by the good atmosphere. To strengthen the comprehensive management of public security. Deepening peace xingan construction, strongly against violence crime, mafia and serious criminal offences, to protect the legitimate rights and interests of citizens, legal persons, carry out criminal policy of temper justice with mercy, the maximum stimulating social vitality, and earnestly safeguard social harmony and stability. To resolve social conflicts by law. To further smooth channels of reporting social conditions and public opinion, improving regulation, arbitration, as well romoting the construction of rule of law, but also the most basic development environment. Despite my good social order in General, but there are law-abiding consciousness, social order is not standard, regardless of faith, Twining visit visit and other outstanding problems. We want to actively promote the field of multi-level governance according to law, promote the continuous improvement of the social environment. To promote universal compliance. Actively foster the rule of law culture, carry out law publicity and education on honesty and trustworthiness, guide the masses and consciously abide by the law, failing to find method, problem-solving method, method of gradually changing the world, he is not looking for but someone "unspoken rules", formed all law law, abide by the good atmosphere. To strengthen the comprehensive management of public security. Deepening peace xingan construction, strongly against violence crime, mafia and serious criminal offences, to protect the legitimate rights and interests of citizens, legal persons, carry out criminal policy of temper justice with mercy, the maximum stimulating social vitality, and earnestly safeguard social harmony and stability. To resolve social conflicts by law. To further smooth channels of reporting social conditions and public opinion, improving regulation, arbitration, as well 例7:用扇子扇风，人觉得凉快，对这现象的解释有如下四句话: ?加快了蒸发吸收人体的热量;?所以感到凉爽;?用扇子扇风加快了空气流动;?加快了人体表面水分的蒸发( 其正确的排列顺序是( ) A(???? B(???? C(???? D(???? 分析:由影响蒸发快慢的因素(液体的温度、液体的表面积、液体表面的空气流动速度)和蒸发的过程吸热解答 解答:蒸发是一种缓慢的汽化现象，它发生在液体表面上，当液体表面的空气流动速度加快时，蒸发速度也加快;同时汽化过程需要吸收热量; 当用扇子扇风时，加快了空气流动，也就加快了人体表面水分的蒸发，从而加快了蒸发吸收人体的热量，所以感到凉爽; as dispute resolution mechanisms, implement fully the petitioners ' cases "third-party" hearings and supervising system of letters and calls, and to resolve the involved law lawsuit into the orbit of rule of law, vexatious, Twining visit visit, disturbing social order and other malicious extortion, resolutely crack down. Five, improving cadres Vitale, provide strong protection for forest development XI General Secretary stressed that the comprehensive revitalization in Northeast China, needs a high quality, solid style, cadres of the dare to play. Cadre cadres is a pledge, should want to do work and able to do good, enthusiasm is paramount. Treat party cadres, it is necessary to Strict management, and warm care, enable the broad masses of cadres work hard work, this is two parallel principles. In strict accordance with the standards of good cadres selection and appointment, the real officers, dare officers, those who want to play, good as excellent cadres at all levels of leadership in the past. At present, some leading cadres work initiative is not high, beyond political, idle, lazy governance governance, not as, slow, messy and a phenomenon still exist to varying degrees, affected and restricted economic and social development. We must mobilize the enthusiasm of cadres as an urgent task, adhere to combination of incentives and constraints, and adhere to the strict management and warm care, practical solution "for the officers not to" problem, motivate cadres and better lead the masses to an undertaking, the cadres and create the new achievement in a dare to play, good at shows as new. To identify the problem, accurate pulse. All things reflected all cadres "for the officers not to" there are 3 main