当前位置:首页>文档>2023版新教材高考物理微专题小练习专题82实验:用油膜法估测油酸分子的直径探究在等温情况下气体压强和体积的关系_4.2025物理总复习_2023年新高复习资料_专项复习

2023版新教材高考物理微专题小练习专题82实验:用油膜法估测油酸分子的直径探究在等温情况下气体压强和体积的关系_4.2025物理总复习_2023年新高复习资料_专项复习

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2023版新教材高考物理微专题小练习专题82实验:用油膜法估测油酸分子的直径探究在等温情况下气体压强和体积的关系_4.2025物理总复习_2023年新高复习资料_专项复习
2023版新教材高考物理微专题小练习专题82实验:用油膜法估测油酸分子的直径探究在等温情况下气体压强和体积的关系_4.2025物理总复习_2023年新高复习资料_专项复习
2023版新教材高考物理微专题小练习专题82实验:用油膜法估测油酸分子的直径探究在等温情况下气体压强和体积的关系_4.2025物理总复习_2023年新高复习资料_专项复习

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专题82 实验:用油膜法估测油酸分子的直径探究在等温情况下气 体压强和体积的关系 1.[2022·江苏省沛县期中考试](1)某同学在用油膜法估测分子直径实验中,计算结 果明显偏大,可能是由于________. A.油酸未完全散开 B.油酸中含有大量的酒精 C.计算油膜面积时舍去了所有不足一格的方格 D.求每滴体积时,1 mL溶液的滴数误多记了10滴 (2)在“用油膜法估测分子的大小”的实验中,所用油酸酒精溶液的浓度为每 104 mL 溶液中有纯油酸6 mL,用注射器测得1 mL上述溶液为75滴.把1滴该溶液滴入盛水的浅 盘里,待水面稳定后,将玻璃板放在浅盘上,用彩笔在玻璃板上描出油膜的轮廓,再把玻 璃板放在坐标纸上,其形状和尺寸如图所示,坐标中正方形方格的边长为1 cm则: ①油酸薄膜的面积是________ cm2. ②每滴油酸酒精溶液中含有纯油酸的体积是________ mL.(取1位有效数字) ③按以上实验数据估测出油酸分子直径约为________ m.(取1位有效数字) 2.在“探究气体压强与体积的关系”的实验中,完成下列问题. (1)实验中的研究对象是________,实验中应保持不变的参量是________,它的体积由 ________直接读出,它的压强由________传感器等计算机辅助系统得到. (2)某同学在实验中测得的数据在计算机屏幕上显示如下表所示,仔细观察“p·V”一 栏中的数值,发现越来越小,造成这一现象的原因可能是________. 序号 V(mL) p(×105 Pa) p·V(×105 Pa·mL) 1 20.0 1.001 0 20.020 2 18.0 1.095 2 19.714 3 16.0 1.231 3 19.701 4 14.0 1.403 0 19.642 5 12.0 1.635 1 19.621 A.实验时注射器活塞与筒壁间的摩擦力越来越大B.实验时环境温度增大了 C.实验时外界大气压强发生了变化 D.实验时注射器内的气体向外发生了泄漏 (3)某同学在一次实验中,计算机屏幕显示如图所示,其纵坐标表示封闭气体的压强, 则横坐标表示的物理量是封闭气体的________. A.热力学温度T B.摄氏温度t C.体积V D.体积的倒数1/V (4)实验过程中下列哪些操作是错误的________. A.推拉活塞时,动作要慢 B.推拉活塞时,手不能握住注射器含有气体的部分 C.压强传感器与注射器之间的软管脱落后,应迅速重新装上继续实验 D.活塞与针筒之间要保持密封性 专题82 实验:用油膜法估测油酸分子的直径 探究在等温情况下气体压强和体积的关系 1.(1)AC (2)①115 ②8×10-6 ③7×10-10 解析:(1)根据d=,油酸未完全散开时,面积减小,所以估测分子直径实验中,计算 结果明显偏大,A正确;油酸中含有大量的酒精没有影响直径的测量,因为油酸本来就是 要加入酒精稀释的,B错误;计算油膜面积时舍去了所有不足一格的方格时,面积测量值 变小,则计算结果偏大,C正确;求每滴体积时,1 mL溶液的滴数误多记了10滴,则体积 的测量变小了,所以计算直径偏小,D错误. (2)①计算油膜面积时满半格的方格算一格,不足半格的不算,则油酸薄膜的面积是 S=n×L2=115×1 cm2=115 cm2; ②每滴油酸酒精溶液中含有纯油酸的体积是 V= mL=8×10-6 mL; ③按以上实验数据估测出油酸分子直径约为 d==×10-2 m=7×10-10 m.2.(1)封闭在注射器内的气体 温度和质量 注射器 压强 (2)D (3)D (4)C 解析:(1)实验中的研究对象是封闭在注射器内的气体,实验中应保持不变的参量是温 度和质量;它的体积由注射器直接读出,它的压强由压强传感器等计算机辅助系统得到. (2)p·V的数值越来越小,造成这一现象的原因可能是气体的质量减小了或者温度降 低了,即实验时注射器内的气体向外发生了泄漏,故选D. (3)根据pV=C,则p=C·,因图像是过原点的直线,则若纵坐标表示封闭气体的压 强,则横坐标表示的物理量是封闭气体的,故选D. (4)推拉活塞时,动作要慢,防止气体温度发生变化,A正确;推拉活塞时,手不能握 住注射器含有气体的部分,防止气体温度发生变化,B正确;压强传感器与注射器之间的 软管脱落后,注射器内封闭的气体的质量会发生变化,不能重新装上继续实验,C错误; 活塞与针筒之间要保持密封性,从而保证质量不变,D正确.
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  1. CONNECT:[ UseTime:0.000358s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000683s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000296s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000284s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000462s ]
  6. SELECT * FROM `set` [ RunTime:0.000206s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000555s ]
  8. SELECT * FROM `wendang` WHERE `id` = 365166 LIMIT 1 [ RunTime:0.000380s ]
  9. UPDATE `wendang` SET `liulancishu` = 4 WHERE `id` = 365166 [ RunTime:0.014945s ]
  10. UPDATE `wendang` SET `lasttime` = 1773060460 WHERE `id` = 365166 [ RunTime:0.000435s ]
  11. SELECT * FROM `wendang` WHERE `id` < 365166 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000535s ]
  12. SELECT * FROM `wendang` WHERE `id` > 365166 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000415s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 365166 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007231s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 365166 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002604s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 365166 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004924s ]
0.109798s