Sunday, September 12, 2010

Chapter 2

I am slightly Mysophobic, aka. Germaphobic. So I thought it was fitting that my first Chemistry blog post would be about the physical and chemical properties of Purell hand sanitizer.
Tada! The magical substance that kills germs!

Physical Properties
  • At room temperature, the hand sanitizer is a liquid.
  • It has a high viscosity- meaning that it is a “thick” liquid (water is a "thin" liquid because it can move very fast).
  • Purell Hand Sanitizer is transparent in color.
  • Has a smell like alcohol, because alcohol is one of the main ingredients.
  • Alcohol freezes at -144* Celsius (compared to the 0* Celsius of water).
Although it is a liquid, it is thick enough that it doesn't always take the shape of it's container. You can see that it has a transparent color because the plate is blue, and the liquid looks blue too.


video


See how high the viscosity is? It takes forever for the hand sanitizer to move a little!

Chemical Properties
  • When I added water with the hand sanitizer, it looks like nothing happens. After a little while, the hand sanitizer will start breaking up and dissolving. This is because hand sanitizer is a liquid, not a solid.
Before:
After:
  • When I soaked a penny in hand sanitizer after a period, the penny became cleaner and shiner. The amount of alcohol in the hand sanitizer must be high enough to get rid of dirt and grime. An effective way to clean coins!
Before:
After:
  • Reading the drug facts on the back of the hand sanitizer, it warns that it is flammable. I was able to find an interesting video of a group of students lighting hand sanitizer.
(That I am not in.)
  • It is NOT sensitive to light. I have had hand sanitizer sitting on the kitchen island for months, and it has not changed color.
Day One:
Day Two:
  • It is extremely toxic (an experiment was not done for this one!) Due to the high alcohol levels in hand sanitizer (~60%), congesting it can be fatal to young children and pets and cause others to become drunk.
It seems that, although hand sanitizer can be very useful it can also be dangerous (flammable, toxic, etc.). I think that this product should not be used with small children, or before meals because of the alcohol levels contained.

2 comments:

  1. Hey Kianna, I thought your idea to use hand sanitizer was clever and a majority of your experiments were very original. Also, well done on proving hand sanitizer was flammable without having to perform any hazardous experiments. All around i thought your blog was well done. My only question is about the experiment with the penny. It seems like a clever experiment and is heading somewhere, but by making the penny cleaner, what does this mean for the hand sanitizer? does it react with copper (or whatever pennies are made of)? Is it acidic? Next time just try to sum up your findings with proper termonolgy. otherwise a terrific job.

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  2. Kianna how impressively creative! I honestly would have never thought to have used hand santizer and what an interesting object at that. You have a really cute introduction and having an interesting and creative writing style is so crucial to blogging. Your organization was impeccable! I could clearly find what I was reading from your clear headings. The photos and video (which was so awesome to include) really helped me visualize your experiment as it was taking place. One thing I would like to add though is with your chemical properties it would be neat to add is that I really liked how you showed a chemical change had/hadn't occured. For example on your senstivity to light you clearly stated that the sanitizer had NOT changed color showing that you understood why it had not undergone a chemical change. Very impressive! Great concluding comment too. It nicely wraps up the end of your posting. I really loved the entire product and I look forward to checking back in later on in the year for more blog postings. Keep up the good work!

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