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Lucapi
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Posted: 12 Mar 2016, 13:32    Post subject: Lucapi's science topic

Like some of you know, I'm into science. I'm at the end of lab school and I am currently having an internship as a teacher's assistant on a highschool. So I thought it would be nice to perform some DIY experiments and take pictures of them and explain how it works. I haven't quite figured out yet how many experiments I will perform or how often I will perform them, but nonetheless, I'm sure some of you will find this interesting to see.

Coming up: Betadine as indacator for starch (12-3-16)



All heil to the nazi admin Last edited by Lucapi on 15 Mar 2016, 20:08, edited 1 time in total.
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Lucapi
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Posted: 12 Mar 2016, 14:01    Post subject: Re: Lucapi's sciece topic

Betadine as indicator for starch

Glucose, the product of photosynthesis, is the main fuel source for our cells. It's also very small. When you chain multiple glucose molecules together, you create starch. Starch can be found in many organisms, and thus in many types of food. Today I'm going to show you which types of food contain starch by adding Betadine to them.

Betadine is an antisceptic (anti-bacterial) substance with a high concentration povidone-iodine. Iodine is a type of atom well known for it's antisceptic property, but it's also known as an indicator for starch. Iodine has a brown-ish color which turns to darkblue/black when it makes contact with starch.

Image

Okay so I got a piece of sal ammoniac candy, a peanut, a piece of bread, a piece of cheese and some peanutbutter. I also dropped a bit of iodine on the paper below to show it's natural color.

Image

I expect the bread, peanutbutter and peanut to turn black, because those items would contain starch.

Here are the results:

Image

As you can see, everything colored black except the cheese. this contradicts my hypothesis because the sal ammoniac turned black as well. I expect that the color of the candy gives us the illusion of the solution turning black.

So the bread, peanut and peanutbutter turned black as I expected. The starch reacted with the iodine to form a deep blue/black colored complex(melecule).



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Ryan
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Posted: 12 Mar 2016, 14:48    Post subject: Re: Lucapi's sciece topic

So as much as I understood, everything turned to a nigga, except cheese, interesting.


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Lucapi
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Posted: 12 Mar 2016, 16:16    Post subject: Re: Lucapi's sciece topic




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Keiezez

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Posted: 12 Mar 2016, 17:50    Post subject: Re: Lucapi's sciece topic

I guess you allerady have considered the daniell cell? It's a chemical reaction that gives us electricity. It's working in the exactly the same way as a normal battery does. I dont have the equipment at my home to do it, but heres a guide https://labbookonline.wikispaces.com/Ex ... niell+Cell


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Posted: 12 Mar 2016, 20:43    Post subject: Re: Lucapi's sciece topic

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Whiskey
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Posted: 13 Mar 2016, 15:54    Post subject: Re: Lucapi's sciece topic

Yeah Science!

Now show us how to cook meth.



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Lucapi
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Posted: 15 Mar 2016, 17:23    Post subject: Re: Lucapi's sciece topic

COMING UP

Red cabbage juice and pH



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Ryan
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Posted: 15 Mar 2016, 19:17    Post subject: Re: Lucapi's sciece topic




Blessed by a shadowy hand coming out of the fucking wall during sleep paralysis.
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Lucapi
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Posted: 15 Mar 2016, 20:06    Post subject: Re: Lucapi's sciece topic




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Ryan
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Posted: 15 Mar 2016, 20:15    Post subject: Re: Lucapi's sciece topic




Blessed by a shadowy hand coming out of the fucking wall during sleep paralysis.
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Lucapi
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Posted: 16 Mar 2016, 18:06    Post subject: Re: Lucapi's science topic

Red cabbage juice as indicator

The level of acid-ness is commonly expressed in pH. This pH number is directly related to the concentration of free protons/hydronium atoms in the solution (H+/H3O+ makes something acid).

To check the pH of a solution, you use an indicator. The most common indicator is a roll of thin paper which can take on 12 or 14 different colors. One for each number on the pH scale (1-14).

A more uncommon indicator is red cabbage juice.

Here's the indicator scale of red cabbage juice:
Image

So I performed this experiment with some anti-grease cleenex stuff, olive oil and pickle juice.

Here's what the solutions looked like before adding the juice:
Image

You can really only see the olive oil because the other solutions were colorless.

Here's a picture after adding the cabbage juice:
Image

At the top theres a blanco, a drop of red cabbage juice without anything else, at the left is the cleenex, at the right side of the plate is olive oil and at the bottom is pickle juice.

As you can see, the cleenex stuff turned kinda blue-greenish. This indicates that it's pH is around 9-10.
The pickle juice kinda turned pink-ish so it seems it's pH is around 4.
The olive oil didn't mix well with the red cabbage juice. But it looks like it has a pH of 3.

In this demonstration I have shown the pH indicating ability of red cabbage juice.



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Lucapi
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Posted: 16 Mar 2016, 18:20    Post subject: Re: Lucapi's science topic

School project

So at school we are working on a green energy project. It's main goal is to teach us about builing and fixing things ourselves and using simple techniques like painting, screwing(hue), applying kit, solding, etc.

The project started off with different groups and individuals of students creating something that would produce energy on an eviromental friendly way. We have to build everything ourselves.

My project is to make a functional windmill out of a bicycle-wheel. I used a wheel with a dynamo in it's axis. My main goal now is to be able to get it to spin even at lower wind speeds. Here's my work so far:
Image

My teacher wanted us to work together more so he came up with the idea of joining projects together. All projects will work to power and heat a doll house:
Image

My project will power the fans of another project though. Another group of students are making a device which will let air flow through blackened soda cans. The cans will absorb solar heat and make the air flowing through them warm. This warm air will then be blown in the dollhouse.

Their project:
Image

There's one other project going on: Making electricity out of growing plants (plant-e). this electricity will be used to power LEDs in the house.

The last project includes solar cells but it's unknown what they will power.

Hope you enjoyed this little tech stuff. If anyone has any questions about how this stuff, or stuff in other experiments work, feel free to reply.



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Whiskey
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Posted: 16 Mar 2016, 19:51    Post subject: Re: Lucapi's science topic

If the olive oil has a pH of 3, shouldn't it taste pretty acidic?


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Lucapi
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Posted: 16 Mar 2016, 20:04    Post subject: Re: Lucapi's science topic




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gini
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Posted: 16 Mar 2016, 22:31    Post subject: Re: Lucapi's science topic

how the fuck should oil have a pH, that's impossible coz the pH refers to the H+-concentration
and as everyone of you knows, oil isnt water soluble, there could be some oleic acid but to measure this you need other shit
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Lucapi
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Posted: 17 Mar 2016, 05:53    Post subject: Re: Lucapi's science topic




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gini
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Posted: 17 Mar 2016, 11:45    Post subject: Re: Lucapi's science topic

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Lucapi
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Posted: 17 Mar 2016, 17:18    Post subject: Re: Lucapi's science topic

The school started off as both chemical and biological. After two years you need to specialize in one of three options (the other one being a medical analyst). I chose the biological/biotechnological specialisation. I'm now in my fourth and last year. In the last half year, so until 10 June, I have an internship as a teacher's assistant. At the end of this school year I'll both qualify to be a biotechnological analyst and a teacher's assistant.

How come you are so well informed in chemistry? Have you followed a similar course?



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gini
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Posted: 18 Mar 2016, 10:12    Post subject: Re: Lucapi's science topic

Yesterday I finischd my bachelor of science in biology, made my thesis in plant biotechnology. I did research for moss (Pyscomitrella patens), with the main topic "molecular farming" which is about the production of biopharmaceuticals in genetically modified plants.
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Lucapi
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Posted: 18 Mar 2016, 15:48    Post subject: Re: Lucapi's science topic




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Ryan
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Posted: 19 Mar 2016, 11:15    Post subject: Re: Lucapi's science topic

Make me an atomic bomb.


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Posted: 20 Mar 2016, 21:21    Post subject: Re: Lucapi's science topic

at first you use bacteria to clone your construct (plasmid) yes, then you make a transformation of moss protoplasts (using an encyme which removes the cellwall of the moss)
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Lucapi
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Posted: 20 Mar 2016, 21:42    Post subject: Re: Lucapi's science topic




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Posted: 21 Mar 2016, 22:43    Post subject: Re: Lucapi's science topic

Science bitch!
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Lucapi
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Posted: 26 Apr 2016, 18:55    Post subject: Re: Lucapi's science topic

Glasses

Okay, so my glasses broke. Where the earpieces meet the frame of the glasses, at one side the spring broke off, so one earpiece would get seperated from the frame. I tried glueing it, but the glue very soon started to stretch, which made my glasses slide off easily.

So today I took them to work (I usually wear contacts on workdays) and I solded the two parts together. I am not pro at solding, but the result is a steady connection with lots of tin inside and outside the connectionpoint.

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Image



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Lucapi
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Posted: 26 Apr 2016, 19:11    Post subject: Re: Lucapi's science topic

Corroding substances on chicken


Yes, you read it correctly, I put corrosive chemicals on pieces of chicken.

I did this experiment to demonstrate what those substanced would do to our skin, and to show students how important it is to wear safety gear. I did this with fresh pieces of chicken, and with dried ones to see which one would give the best results.

For this experiment I used:
Hydrogenperoxide 10% (H2O2)
Sulfuric acid 98% (H2SO4)
Nitric acid 65% (HNO3)
Sodiumhydroxide 5M (NaOH)

The chemical formulas are written on the petridishes.

The dry ones before adding the chemicals:
Image

The dry ones after adding the chemicals:
Image

And the "wet/fresh" ones:
Image
Image


As you can see, the hydrogenperoxide creates a white foam-ish on top of the meat. I suspect that these are bubbles of hydrogen gas, as a byproduct of the oxidation of the organic compounds.

The nitric acid gives the meat a yellow and burnt look. EVen though you can't see it in the picture, the fresh meat started to bubble and smoke when I dropped nitric acid on top of it. It smelled rotten, that's why I performed this experiment in a fume hood.

The sulfuric acid and sodiumhydroxide didn't give such spectacular reactions, but they did seem to dissolve and weaken the meat a bit. The pieces of meat that came into contact with the sodiumhydroxide typically became a little colorless. While the pieces that came into contact with sulfuric acid became a little black, especially the dry ones.

So please do wear protection when doing chemistry. Always wear a rubber.... glove on your hands.



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