Simple Science - experiment digest # 28


We continue to release experiments in an updated form with a more colorful design.

There are four chemical experiences in this issue:
  • burning acetone on a wire;
  • fire foam;
  • acid fire;
  • spy ink.

Acetone burning on wire

For the experiment you will need: copper wire, acetone, a glass vessel, a gas burner.

First you need to roll a tight spiral out of copper wire and heat it with a gas burner. Meanwhile, pour a little acetone into the vessel, which will immediately begin to evaporate. And we just need a pair of acetone.

When a heated copper wire is introduced into a vessel with vapors, catalytic oxidation of acetone begins to occur on the surface of the wire. As a result of this chemical reaction, a significant amount of heat is generated. This heat is enough to red-hot the copper wire.

Fire foam

For the experience you will need: a basin with water, liquid soap, a cylinder of propane, matches.

The foam in the experiment is filled with natural gas. When a burning match is brought to the foam, part of the soap balls are destroyed (mainly due to the thermal expansion of the gas in the balls), releasing combustible gas to the outside. Gas immediately ignites, capturing all the foam. Since the foam itself consists of water, the heat released during the combustion of methane goes to the evaporation of water, and the rest of the heat rushes up and does not burn the experimenter.

Acid fire

For the experiment you will need: sulfuric acid, acetone, potassium permanganate (potassium permanganate), cotton wool, a cup, a glass rod, a metal stand.

As a result of the interaction of potassium permanganate (potassium permanganate) and sulfuric acid, manganese (VII) oxide, water and potassium sulfate (or hydrosulfate) are formed.

Mn2O7 is a strong oxidizing agent, in contact with many substances it causes ignition, and sometimes explosion, because it decomposes into free oxygen and lower manganese oxides at a temperature just above 50 degrees. This temperature is achieved by the exothermic process of the interaction of sulfuric acid with water.

Vata up to 99% consists of cellulose and can be oxidized by manganese oxide to water and carbon dioxide.

However, in our case, cotton wool is needed only for a uniform influx of acetone, since acetone is a highly flammable substance (flash point 19 ° C), however air mixtures containing from 2.5% to 12.8% (by volume) are explosive.

Spy ink

For the experiment you will need: citric acid, iodine, a cup, water, a wooden or cotton swab.

To write a cipher, it is enough to have citric acid or a simple lemon on hand. We make inscriptions with a wooden or cotton swab, after wetting the tip with citric acid.

To decrypt the message, it is enough to place the leaf in the iodine solution. But if the message needs to be saved, you can simply iron it and the inscription will also appear.

IMPORTANT NOTE : testing with reagents is only possible in a well-ventilated area!

Book with experiences for children

Soon our first book for children, SIMPLE SCIENCE, is coming out, a pre-order for which is already available. We are sure that the book will be a good gift for the new year;)