题目内容
(8分)本题有两小题:(1)图所示是“比较水和煤油吸热升温特点”的实验装置.
①加热过程中,用搅棒搅动的目的是_________________;水和煤油吸热的多少是通过_______________________来反映的(选填“温度计示数”或“加热时间”)。
②关于该实验的变量控制,下列要求中不正确的是______________(填字母)
A.采用相同的加热方法(如酒精灯火焰的大小,与烧杯底的距离等)
B.烧杯中分别装入相同体积的水和煤油
C.使用相同的烧杯
(2)用压强计“探究影响液体内部压强大小的因素”;
①图19所示压强计是通过U形管中液面的______________来反映被测压强大小的.使用前应检查装置是否漏气,方法是用手轻轻按压几下橡皮膜,如果U形管中的液体能灵活升降,则说明装置_________________(选填“漏气”或“不漏气”)。
②图20甲、乙、丙、表示探究过程中的三个情景.容器中的液体、金属盒插入的深度以及U形管中液面情况,都可以从图上看出.比较图_________________可知液体压强大小与深度有关;比较图______________可知液体压强大小还与液体的密度有关。
(1)①使液体均匀受热 加热时间 ②B (2)①高度差 不漏气 ②甲和乙 乙和丙解析:
略
略
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