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DANGEROUS!
In chemistry you are told never to mix Sulfuric acid Potassium permanganate.
If you mix concentrated Sulfuric acid and Potassium Permanganate it creates the highly unstable manganese(VII) oxide (Mn2O7) which reacts violently with organic compounds and this can be shown through its action on cotton wool soaked in ethanol.
In this example the ethanol has been saturated with Boric Acid, so that once the ethanol has burned away the flame changes to green for a little bit of extra flare.
This little demo lets you show the dangers without risking life and limb.
Safety point!
Mn2O7 is corrosive, explosive and oxidising. Wear a face shield or goggles.
Cell membranes are a phospholipid bilayer with protein channels floating amidst the layer, which allow substances to enter or leave the cell.
Visually and structurally they very similar to soap bubbles, so if you strengthen the soap bubble with glycerol, gently place a string loop onto the soap bubble, and then pop the part of the bubble inside the loop, surface tension will pull the loop into a perfect circle and the hole will now float in the bubble and can even be moved around.
So it's a nice way to help people visualise how the surface of cells can have holes in them.
A microscale test for Ammonium salts in a petridish.
1) Place a piece of paper under the Petri dish to help with visibility.
2) Place a red litmus paper in the inside Petri dish and dampen with distilled water.
3) Then add 2 drops of 0.1M Ammonium salt (ammonium nitrate in this case).
4) Now add 2 drops of 0.4M Sodium Hydroxide onto the same spot as the Ammonium salt drops.
5) Gently stir (I used a wooden splint) and cover the Petri dish.
6) Wait for the red litmus paper to turn blue as Ammonia gas is produced and diffuses to the damp litmus paper.
A microscale test for Ammonium salts in a petridish.
1) Place a piece of paper under the Petri dish to help with visibility.
2) Place a red litmus paper in the inside Petri dish and dampen with distilled water.
3) Then add 2 drops of 0.1M Ammonium salt (ammonium nitrate in this case).
4) Now add 2 drops of 0.4M Sodium Hydroxide onto the same spot as the Ammonium salt drops.
5) Gently stir (I used a wooden splint) and cover the Petri dish.
6) Wait for the red litmus paper to turn blue as Ammonia gas is produced and diffuses to the damp litmus paper.
To take over the world I must first learn basic science!
That and stop watching cat videos, whichever comes first.