chemical reaction

  • [ one day in a chemistry lab ]
  • Lab instructor:Okay, everyone, find a partner!
  • Kise:Kurokocchi! Kurokocchi! Let's be partners!
  • Kuroko:Sorry Kise-kun but I already promised to be partners with Akashi-kun.
  • Kise:Whaaaat?! Then, Aominecchi! Aominecchi!
  • Aomine:*talking to Kagami* Don't worry bruh, those chemical reactions got nothing on us!
  • Kise:*realizes Midorima is the only one without a partner*
  • Midorima:...
  • Kise:*sniffles* Midorimacchi ――
  • Midorima:You've got to be kidding me.

This is a fun chemical reaction that often goes under the name of elephant toothpaste,  obviously because it looks like giant toothpaste.

This is a pretty cool reaction because it only requires hydrogen peroxide (H2O2,) yeast dissolved in water and dish soap. And bam “toothpaste”

The great thing is the only byproducts are water, soap and oxygen. Clean up is easy, no harmful toxins. Great for showing kids and adults alike the wonders of chemistry! (beware, this is an exothermic reaction and puts off a lot of heat – if you try it at home take safety precautions to avoid burns.)

3

The violent reaction between sodium hydride and water. 

Sodium hydride is a salt-like hydride, composed of Na+ and H− ions, it is an ionic material that is insoluble in organic solvents, but soluble in molten sodium metal and quite often used as a base in chemistry. 

When contact with water sodium hydride releases hydrogen, turns into sodium hydroxide and generates a lot heat. Because of this heat the generated hydrogen gas ignites and because of the presence of sodium ions it burns with an intense yellow color (as seen). 

NaH(s) + H2O(l) –> NaOH(aq) + H2(g) 

Because of this, NaH is usually sold mixed with mineral oil what keeps away water and protects the hydride from moisture. However if it is stored for long time, it should be titrated by measuring the amount of hydrogen generated from the reaction of the hydride and an alcohol. 

Science!

4

‘Hot ice’ is created using sodium acetate, which is a salt created from the reaction between sodium bicarbonate, or baking soda, and acetic acid, or vinegar. When this reaction occurs, sodium acetate appears to freeze like ‘ice’ as the cold solution turns from liquid to solid. This process is exothermic, meaning that the solid structure is warm to the touch. Solutions of sodium acetate are used in certain types of hand-warmers. When a metal button is pressed inside the plastic pouch containing the solution, it releases chemicals that starts the reaction. Don’t worry his hand is fine.

Sulphuric Acid and sugar- dehydration of sugar (sucrose)

“Basically, all you do to perform this demonstration is put ordinary table sugar in a glass beaker and stir in some concentrated sulfuric acid (you can dampen the sugar with a small volume of water before adding the sulfuric acid). The sulfuric acid removes water from the sugar in a highly exothermic reaction, releasing heat, steam, and sulfur oxide fumes. Aside from the sulfurous odor, the reaction smells a lot like caramel. The white sugar turns into a black carbonized tube that pushes itself out of the beaker.

Sugar is a carbohydrate, so when you remove the water from the molecule, you’re basically left with elemental carbon. The dehydration reaction is a type of elimination reaction.

C12H22O11 (sugar) + H2SO4 (sulfuric acid) → 12 C (carbon) + 11 H2O (water) + mixture water and acid

Although the sugar is dehydrated, the water isn’t ‘lost’ in the reaction. Some of it remains as a liquid in the acid. Since the reaction is exothermic, much of the water is boiled off as steam.”

This is post number 9 in the “Acid + Things” series for today.

Enjoy!

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Science + Slow Motion = an awesome lesson in precisely what happens when a match is lit. A couple years ago YuTube contributor UltraSlo captured incredible slow motion footage of a match catching fire at 4,000 frames per second. Now those wonderful brainiacs at the American Chemical Society have used that fascinating footage to explain exactly how matches work and what’s happening at the molecular level from the moment the match is struck. We had no idea how many chemical reactions rapidly take place in that fleeting instant:

[via Gizmodo]