扩散实验室-碘和玉米淀粉

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材料和设置-这样做既简单又便宜,而且效果和使用透析管一样。作为渗透和扩散装置的一部分,演示/实验室很棒!

每两个学生:

  • handout from Biology Corner
  • 大型烧杯
  • inexpensive sandwich bag – non sealing (I used Wegmans 150 ct)
  • 1汤匙玉米淀粉
  • 50毫升水
  • rubber band
  • 衣夹
  • 量筒
  • 100毫升碘稀释液

Iodine Preparation

  • 在500毫升水中加入20毫升碘
  • measure out 100 mL of diluted iodine for each group

Prelab Prep:

  1. Place one bag over each beaker
  2. 每袋加1汤匙玉米淀粉
  3. Add 50 mL of water to each bag
  4. Check for leaks
  5. Use a rubber band on each one to keep closed
  6. 将袋子夹到烧杯上

观察

  1. Students will add iodine and make observations – changes will take place within a few minutes and the longer it sits,它会变得越暗。
    1. 碘可以通过塑料袋,the starch is not
  2. 让学生把袋子拿出来看看发生了什么变化。
  3. Discuss

Update–周末我让布景休息,当我今天进来的时候,the water was almost completely clear – looks like just William Hill轮盘about all of the iodine moved into the bag:

20181008Y07264220181008_072702

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关于“2”的思考扩散实验室-碘和玉米淀粉

  1. Christine Connolly 10月7日,下午2018点/下午6点58分

    你好,I'm just finishing up investigations with my 7th graders on osmosis and diffusion.Oddly,我试了这个设置,希望便宜的袋子能起作用。我们试过使用Z-LOC品牌的袋子,但运气不好(只是给公司的信让他们知道他们的袋子有多不透水),所以我使用了商店品牌的袋子,我们仍然很失望。I guess we all felt better William Hill轮盘about our sandwiches wrapped in these baggies but not to see the diffusion.We did a great investigation with carrots and salt and then moved onto "naked eggs".我非常希望这个袋子能起作用。很高兴为你们的船员们做了这件事。

    Liked by1 person

    • 丽兹拉罗萨 10月7日,2018 / 7:13 pm

      我们要么用韦格曼品牌的折叠三明治袋,要么用ShopRite——我没写下来就把盒子扔掉了——对不起,这对你们班不起作用。
      胡萝卜听起来不错,I saw one using potato slices that I thought William Hill轮盘about using as well.我从来没有试过鸡蛋,but heard it works well

      最新消息——这是Wegmans品牌,盒子还在我房间里

      Like

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