题目内容
(8分)在“用油膜法估测分子的大小”的实验中,用分度值为0.005
的移液管,量取0.100
油酸,倒入标称250
的容量瓶中,再加入酒精使油酸溶解,最后得到250
的溶液。然后用滴管吸取这种溶液,向分度值为0.1
的小量筒中滴入100滴溶液,溶液的液面达到量筒中1
的刻度。再用滴管取配好的油酸溶液,向撒有痱子粉的盛水的浅盘中滴下5滴溶液,在液面上形成油酸薄膜,待油膜稳定后,放在带有正方形坐标格的玻璃板下观察油膜,如图所示。坐标格的正方形的大小为
。由图可以估算出油膜的面积是 ▲
(结果保留二位有效数字);由此估算出油酸分子的直径是 ▲
(结果保留一位有效数字)。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412194467812255.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121944459331.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121944459331.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121944459331.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121944459331.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121944459331.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121944459331.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121944600445.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121944631344.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121944647204.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412194467812255.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121944693306.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121944834395.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121944849304.gif)
略
![](http://thumb2018.1010pic.com/images/loading.gif)
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