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自学热量和比热容!中考试题赏析

自学热量和比热容!中考试题赏析

2025年辽宁】如图(a),某小组在两个相同的烧杯中分别装入质量相同的水和食用油,比较它们的吸热能力。

为使两个电加热器在单位时间内放出的热量相同,电加热器的规格应

⑵本实验中使用的液体温度计是根据液体的规律制成的。

⑶每隔0.5min记录一次温度,并将数据记录在下表中。第2.5min时,食用油中的温度计示数如图(b)所示,为℃。分析表中数据,发现吸热能力强。

⑷为使内部充有液态介质的电暖器通电后能迅速升温,内部应充入吸热能力较(填“强”或“弱”)的介质。(仅从吸热能力的角度分析)

【解析】⑴根据转换法,选择相同的电加热器目的是为了相同时间内,两个电加热器对水和食用油放出的热量相同;

注:在研究看不见的物质或现象时,可以通过研究该物质或现象所产生的可见的效果,由此进一步分析物质或现象,这种方法叫转换法。如把音叉的振动转化为乒乓球的振动。

⑵实验使用的温度计是根据液体的热胀冷缩规律制成的;

⑶如图b,温度计的分度值为1℃,读数为46℃;这儿要注意根据刻度值大小的变化判断零刻线的位置,如下图所示,左图为零下22℃,右图为38℃。关于温度计的使用方法,请看:巧记温度计的使用方法

根据列表中的数据可知,加热相同的时间,水和食用油吸收的热量相同,食用油的温度升高的多,说明水的吸热能力强;

⑷为了使它通电后能快速升温,根据知,在质量和吸热相同的条件下,其内部应充入比热容较小的液体,即内部应充入吸热能力较弱的介质。

故答案为:⑴相同;⑵热胀冷缩;⑶46;水;⑷弱。

2025年成都】小雨探究液体的凝固特点:先在两个相同容器中分别装入初温为20℃、质量为100g的水和某液体M,再各放入一个温度传感器,然后使它们冷却凝固。若单位时间内它们放出的热量相等,用测得的数据绘出两种物质温度随时间变化的图像,如图所示。已知c4.2×103J/kg•℃),实验在标准大气压下进行,下列说法正确的是(  )

A.液体M的比热容为2.8×103J/kg•℃)

B.液体M放热能力比水放热能力强

C.在t2t4时间段两种物质都是固液共存状态

D.从20℃刚好降到0℃时,水放出的热量小于M放出的热量

【解析】标准大气压下,水的凝固点为0℃,故图中右边的图像为水的温度随时间变化图像;(注:有关水的物理性质一定要记清,如水的沸点、凝固点、密度和比热容)

A、单位时间内它们放出的热量相等,0t2时间段内,水放出热量:

由于水和M吸收的热量相等;

解得:cM2.8×103J/kg•℃),故A正确;

BcMc,液体M放热能力比水放热能力弱,故B错误;

C、从图中可以看出,t2t3时间段,温度高于凝固点0℃,水为液态,t3t4时间段,两种物质才都是固液共存状态,故C不正确;

D、降低相同的温度,比热容大的物质放出热量多,ccM,水放出的热量大于M放出的热量,故D错误;

故选:A

提示:本章内容和初二学的《物态变化》、《功和机械能》关联密切,请提前做好复习准备。同时,也体验到课本的重要性,课本上的图、画和话,是中考出题的依据和出发点。

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  1. CONNECT:[ UseTime:0.000723s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000747s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.020852s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000641s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001295s ]
  6. SELECT * FROM `set` [ RunTime:0.017461s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001309s ]
  8. SELECT * FROM `article` WHERE `id` = 844272 LIMIT 1 [ RunTime:0.002191s ]
  9. UPDATE `article` SET `lasttime` = 1783576182 WHERE `id` = 844272 [ RunTime:0.030784s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000712s ]
  11. SELECT * FROM `article` WHERE `id` < 844272 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006863s ]
  12. SELECT * FROM `article` WHERE `id` > 844272 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.032512s ]
  13. SELECT * FROM `article` WHERE `id` < 844272 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003536s ]
  14. SELECT * FROM `article` WHERE `id` < 844272 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.009953s ]
  15. SELECT * FROM `article` WHERE `id` < 844272 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008972s ]
0.312231s