Monday, May 25, 2015

CSI Science: Case of the Kidnapped Cookies Day 3

This post is the fourth in a series of posts about a CSI program I ran at our library.  You can read the background information here and here and here.


Day 3 found us analyzing the red marks on the ransom note envelope. It was (somewhat mysteriously) determined that the red marks are lipstick and lipstick samples from each suspect have been collected.




This is the only part of the unit that requires you to gather your own materials.  The kit comes with one lipstick sample, and it's necessary to come up with 3 additional samples, as well as some acetone to act as solvent.  This was the only part of this product that I found frustrating.  For all of the other materials included, it seemed silly that the lipstick was not.  It wasn't terribly hard to find inexpensive lipstick to use for the activity, but once you remove a chunk of the lipstick to have available for testing, it makes the rest of the lipstick fairly useless (and there's a lot of it left).

I'd recommend having your students perform a different chromatography experiment prior to this investigation (a simple black marker chromatography works great). The results of our lipstick chromatogaphy were basically all the same, and these students, being unfamiliar with the process, were looking for differences that just weren't there.  I think that if they had some background with the process, they'd better understand what different results look like (and how fun it can be to watch the colors separate).
Some of our chromatography strips.

The best part of this activity was the container provided to run the chromatography in.  It was a small plastic container, like you might get in the deli of a grocery store.  At first I was very skeptical of how it work, but it turns out, it was great!  There's a small ridge in the bottom of the container, and you can prop the chromatography paper strips up along that ridge.  You only need a very small amount of solvent, and you don't have to mess around with trying to suspend the paper strips from a pencil and trying to get height of the strips and the height of the solvent appropriately aligned.  I'll definitely try it that way again!


After we finished the chromatography, some students worked on putting their word-by-word Spanish translation together into something that made sense and others worked on determining which newspaper(s) the letters on the ransom note had come from.

Throughout the meeting (and all the others for that matter), the students regularly returned to the suspect bios to compare what new information they'd learned with the information about the suspects.


*****
The Case of the Kidnapped Cookies Kit was provided to me at no cost, for use with a group of students at my library.  I was not compensated by Educational Innovations in any other way, and all opinions expressed are my own.

5 comments:

  1. Chromatography always captured me in the university. Theories, experiments, suspicions are what is inherent in the present expert of his case.

    ReplyDelete
  2. I want the same teacher for my childrens. I think that this kind of activity has a good effect on the development of children. Have enough time to do it, because I found the servicc, which offer good application search optimization for low cost and I don't need to spend so much money and time on this.

    ReplyDelete
  3. My life is beautiful thanks to you, Mein Helfer. Lord Jesus in my life as a candle light in the darkness. You showed me the meaning of faith with your words. I know that even when I cried all day thinking about how to recover, you were not sleeping, you were dear to me. I contacted the herbal center Dr Itua, who lived in West Africa. A friend of mine here in Hamburg is also from Africa. She told me about African herbs but I was nervous. I am very afraid when it comes to Africa because I heard many terrible things about them because of my Christianity. god for direction, take a bold step and get in touch with him in the email and then move to WhatsApp, he asked me if I can come for treatment or I want a delivery, I told him I wanted to know him I buy ticket in 2 ways to Africa To meet Dr. Itua, I went there and I was speechless from the people I saw there. Patent, sick people. Itua is a god sent to the world, I told my pastor about what I am doing, Pastor Bill Scheer. We have a real battle beautifully with Spirit and Flesh. Adoration that same night. He prayed for me and asked me to lead. I spent 2 weeks and 2 days in Africa at Dr Itua Herbal Home. After the treatment, he asked me to meet his nurse for the HIV test when I did it. It was negative, I asked my friend to take me to another nearby hospital when I arrived, it was negative. I was overwhite with the result, but happy inside of me. We went with Dr. Itua, I thank him but I explain that I do not have enough to show him my appreciation, that he understands my situation, but I promise that he will testify about his good work. Thank God for my dear friend, Emma, I know I could be reading this now, I want to thank you. And many thanks to Dr. Itua Herbal Center. He gave me his calendar that I put on my wall in my house. Dr. Itua can also cure the following diseases ... Cancer, HIV, Herpes, Hepatitis B, Inflammatory Liver, Diabetis, Bladder Cancer,Colorectal Cancer,HPV,Breast Cancer,Kidney Cancer,Leukemia,Lun,Fribroid,Infertility,Parkinson's disease,Inflammatory bowel disease ,Fibromyalgia, recover your ex. You can contact him by email or whatsapp, @ .. drituaherbalcenter@gmail.com, phone number .. + 2348149277967 .. He is a good doctor, talk to him kindly. I'm sure he will also listen to you.

    ReplyDelete