Chemistry experiment 61 - Sugar vs. sulfuric acid koen2all 2017-10-14 | This video is for demonstratio purposes only. Sugar is dehydrated by sulfuric acid, leaving black carbon behind.
Chemistry experiment 60 - Dry ice bubble koen2all 2017-06-02 | A 'dry ice bubble' can be made using some dry ice, water, a string and soap. Watch another fun dry ice video here:youtube.com/watch?v=KC6utPfT35sWARNINGThis video is for demonstration purposes only!
Chemistry experiment 59 - Fun with dry ice koen2all 2017-06-02 | Dry ice in water produces beautiful dense clouds.Watch another fun dry ice experiment: the 'dry ice bubble': youtu.be/7yAH0RbYhEYWARNINGThis video is for demonstration purposes only!
Chemistry experiment 58 - Burning pencil sharpener koen2all 2017-01-02 | Some pencil sharpeners are made of elementary magnesium. They can be set on fire using a gas torch. A bright white flame can be observed.
Chemistry experiment 57 - Green borate flame koen2all 2016-12-22 | Boric acid reacts with methanol in the presence of sulfuric acid, forming an inorganic ester known as trimethyl borate. This is a flammable compound and can be easily ignited. A beautiful green flame is observed during the combustion.
Chemistry experiment 56 - Instant fire: Potassium permanganate and glycerin koen2all 2016-11-05 | This experiment demonstrates the oxidation of glycerin by potassium permanganate. A few drops of glycerin are placed into a hollow in a pile of finely crushed potassium permanganate crystals. An exothermic redox reaction occurs, with the glycerin boiling and producing a purple flame that spreads around the pile of potassium permanganate.
Chemistry experiment 55 - Whoosh bottle koen2all 2016-10-16 | A bottle filled with ethanol vapor is ignited. This results in a loud 'whoosh'. WARNINGThis video is for demonstration purposes only!
Chemistry experiment 54 - Growing a Crystal Tree (time-lapse) koen2all 2016-10-05 | This video is a time-lapse movie of a growing ''crystal tree'', also known as ''magic tree'', ''salt tree'' etc. These kits can be found in most gadget or toy stores or can be purchased online. Time-lapse contains approx. 8 hours of footage.
Chemistry experiment 53 - Plastic Sulfur koen2all 2015-06-12 | When sulfur is heated over 160 degrees C, it forms high molecular weight linear polymers. The polymer form is a brown and rubber-like substance.
Chemistry / physics experiment 52 - Glowing pickle koen2all 2015-05-05 | A pickle is positioned on two iron nails. When a high AC voltage (around 120V) is placed across the pickle, an electric current will pass between the nails. The current will excite sodium ions present in the pickle. The result: a glowing pickle! Safety:- Potentially lethal shock hazard!
Chemistry experiment 51 - Genie in a bottle koen2all 2015-04-25 | When potassium permanganate is added to a concentrated solution of hydrogen peroxide, a violent decomposition reaction occurs. Safety:- Hydrogen peroxide is corrosive.- Potassium permanganate is an oxidizing agent.- A lot of heat is produced during this reaction.
Chemistry experiment 50 - Underwater Explosions: Acetylene reacting with Chlorine koen2all 2015-03-08 | Acetylene gas and chlorine gas are mixed. This results in violent explosions. Chlorine gas was prepared by adding dilute hydrochloric acid to trichloroisocyanuric acid (swimming pool chlorine tablets). Acetylene gas was prepared by adding calcium carbide to water. Safety:- Explosions can be quite violent. - Chlorine gas is very toxic. - Acetylene is flammable.
Chemistry experiment 49 - Whistling Test Tube: reaction between sulfur and iron koen2all 2015-03-05 | Some steel wool is put in a test tube containing a small quantity of sulfur. As the test tube is heated, the following reaction will occur:Fe + S → FeSDuring the heating, a loud whistle can be heard. This is a physical phenomenon known as a thermoacoustic engine or a Rijke tube. The whistle is produced by ascending air inside the tube. Safety:- During heating, toxic sulfur vapors may escape and ignite.
Chemistry experiment 48 - Manganese Heptoxide koen2all 2015-02-12 | Manganese heptoxide, a highly reactive green liquid, is made by mixing solid potassium permanganate with concentrated sulphuric acid. Hazards:- Sulfuric acid is very corrosive.- Potassium permanganate is a strong oxidizer. - The formed compound is extremely dangerous. Contact with a combustable compound will instantly result in a vigorous exothermic reaction.
Chemistry experiment 47 - Sublimation of Iodine koen2all 2015-02-09 | At room temperature, elemental iodine is a black-bluish solid. When heated, solid iodine sublimates and enters the gas phase. Iodine got its name from the Greek word ‘ἰοειδής’, meaning ‘purple’. Indeed, iodine vapor has a beautiful purple color. Regaining solid iodine from iodine vapor can be achieved by cooling down iodine vapor on a cold surface. Beautiful iodine crystals are formed.Hazards:- Iodine is toxic
Chemistry experiment 46 - Flaming Flask koen2all 2015-02-07 | Aluminium by itself is a very reactive metal. However, aluminium is oxidized when exposed to air, forming a thin layer of protective aluminium oxide on its surface. When some aluminium foil is added to a solution of copper(II) chloride in concentrated hydrochloric acid, the layer of aluminium oxide will be destroyed by chloride ions. Al2O3 + 2Cl- + 3H2O → 2[Al(OH)2Cl] + 2OH-The exposed aluminium metal reacts with hydrochloric acid, producing hydrogen gas. 2Al + 6H3O+ → 2Al3+ + 6H2O + 3H2Hydrogen gas can be ignited. The color of the flame is blue/green due to the presence of Cu2+ ions.Hazards:- Hydrochloric acid is very corrosive
Chemistry experiment 45 - Ammonium dichromate volcano koen2all 2015-02-01 | Classic demonstration of the decomposition of ammonium dichromate.Hazards: - Ammonium dichromate is toxic and a carcinogen.
Chemistry experiment 43 - Fun with sodium acetate: hot ice koen2all 2015-01-04 | A supersaturated solution of sodium acetate can be used to create beautiful sodium actetate crystals and sculptures.
Chemistry experiment 42 - Explosive properties of azides koen2all 2015-01-02 | The explosive properties of lead azide and silver azide are demonstrated.Hazards:- Lead nitrate is very poisonous.- Silver nitrate is hazardous. - The formed compounds are highly explosive.
Chemistry experiment 41 - Golden rain koen2all 2014-09-13 | Lead(II) nitrate and potassium iodide react forming yellow lead(II) iodide.Hazards: - Lead nitrate is very poisonous.
Chemistry experiment 40 - Bleeding iron koen2all 2014-09-09 | An iron wire is placed in a test tube containing a solution of potassium thiocyanate, hydrogen peroxide and hydrochloric acid.
Chemistry experiment 39 - Reaction between zinc and sulfur koen2all 2014-09-08 | Zinc and sulfur react when heated. Zinc sulfide, a luminescent compound, is formed.
Chemistry experiment 38 - Copper(II) complexes koen2all 2014-09-08 | Cu2+ ions are able to form different complex ions.
Chemistry experiment 37 - Temperature dependent color koen2all 2014-09-02 | The color of a cobalt sulfate solution in the presence of chloride ions is dependent on temperature.
Chemistry experiment 36 - Blue clouds of a chromium peroxo complex koen2all 2014-09-01 | Reaction between dichromate and hydrogen peroxide in acidic solution forming the blue chromium peroxo complex CrO5.Hazards:- These chromium compounds are carcinogens.
Chemistry experiment 35 - Iron burning in oxygen koen2all 2014-08-22 | In pure oxygen, iron becomes very flammable.
Chemistry experiment 34 - Phosphorus burning in oxygen koen2all 2014-08-22 | Red phosphorus burns brightly in an atmosphere of pure oxygen.Hazards:- Poisonous fumes are formed while burning phosphorus.
Chemistry experiment 33 - Fehlings test koen2all 2014-08-20 | This video shows how to make Fehling's solution, which can be used to test for the presence of glucose. Fehling's A: copper(II) sulfate solution. Fehling's B: potassium sodium tartrate and sodium hydroxide solution. Poured together: Fehling's solution.
Chemistry experiment 32 - Reaction between bromine and aluminium koen2all 2014-08-19 | Violent reaction between liquid bromine and a piece of aluminium foil. 2Al + 3Br2 → 2AlBr3Hazards:- Bromine is extremely corrosive and poisonous.
Chemistry experiment 31 - Chemical garden koen2all 2014-08-18 | Different metal salts are dropped into a solution of sodium silicate (waterglass). Plant like silicates are formed. 1 part waterglass and 2 parts water. Salts used:- Copper(II)sulfate- Copper(II)chloride- Aluminium potassium sulfate - Iron(II)sulfate- Cobalt(II)sulfate- Nickel(II)chloride
Chemistry experiment 30 - HCl fountain koen2all 2014-08-17 | Hydrogen chloride (HCl) is highly soluble in water. A solution of hydrochloric acid is formed.Hazards:- HCl is poisonous and irritating. - Hydrochgloric acid is corrosive
Chemistry experiment 29 - Copper + nitric acid fountain koen2all 2014-08-14 | Copper reacts with nitric acid, forming blue Cu2+ ions. Also, a brownish mixture of nitrogen dioxide and nitric oxide gas is formed. Nitrogen dioxide reacts with water, forming nitric acid. The latter reaction causes a low pressure in the left flask. Therefore, water from the right flask is sucked into the left flask.Hazards:- Nitric acid is corrosive.- Formed gases are very toxic.
Chemistry experiment 28 - Iodine clock reaction koen2all 2014-08-12 | Famous iodine clock reaction: oxidation of potassium iodide by hydrogen peroxide. Mixture A:- 10 mL 2.0 M sulphuric acid- 10 mL 3% hydrogen peroxide- 80 mL waterMixture B: - Solution of 0.04 g sodium thiosulfate pentahydrate in 20 mL water- Solution of 0.9 g potassium iodide in 5 mL water- 4 mL starch solution- 71 mL water
Chemistry experiment 27 - Reaction between sodium metal and chlorine gas koen2all 2014-08-12 | This video shows the reaction between sodium metal and chlorine gas. The reaction product is sodium chloride (table salt).Hazards:- Sodium metal is very reactive. - Chlorine gas is poisonous.
Chemistry experiment 26 - Electrolysis of aqueous solutions koen2all 2014-08-12 | Some classic electrolysis experiments are performed by using a U-shaped glass tube, carbon electrodes, a 12V DC power supply and various aqueous solutions.
Chemistry experiment 25 - Red cabbage pH indicator koen2all 2014-08-10 | Red cabbage can be used as a colorful pH indicator. This video shows how to make red cabbage extract and how to use this extract to make pH indicator strips.
Chemistry experiment 24 - Oxidation states of vanadium koen2all 2014-08-10 | Vanadium has four oxidation states in aqueous solution; +5, +4, +3 and +2. Each oxidation state has its own color. In this experiment, sodium sulfite and zinc powder are used to reduce vanadium.Hazards:- Vanadium compounds are toxic.
Chemistry experiment 23 - Sodium reacting with water koen2all 2014-08-04 | Sodium metal reacts rapidly with water, forming a solution of sodium hydroxide and hydrogen gas.Hazards:- Sodium metal is very reactive. - Hydrogen gas is flammable. - A lot of heat is produced during this reaction. - Sodium might ignite and explode during this reaction. - The formed solution of sodium hydroxide is corrosive.
Chemistry experiment 22 - Elephants toothpaste (scaled up) koen2all 2014-08-04 | Adding a solution of potassium iodide to a concentrated solution of hydrogen peroxide causes the hydrogen peroxide to break down into water and oxygen gas. Oxygen gas and soap produce a large amount of foam.Hazards:- Concentrated hydrogen peroxide is very corrosive.
Chemistry experiment 21 - Blue bottle koen2all 2014-08-04 | Classic blue bottle experiment. Shaking a solution containing sodium hydroxide, glucose and methylene blue gives a blue liquid. After a while, the solution decolorizes. This cycle can be repeated a number of times.
Chemistry experiment 20 - Growing sodium thiosulfate crystals koen2all 2014-08-03 | A supersaturated solution of sodium thiosulfate is prepared. Adding a solid piece of sodium thiosulfate initiates the crystallization of the solution.
Chemistry experiment 19 - Nitrocellulose koen2all 2014-08-03 | Nitrocellulose is a highly flammable compound which can be made by nitrating cellulose in pieces of cotton wadding using concentrated sulphuric and nitric acid.
Chemistry experiment 18 - Underwater fireworks koen2all 2014-08-02 | Concentrated sulphuric acid and potassium permanganate form manganese heptoxide, a highly reactive compound. Manganese heptoxide reacts with ethanol, giving bright flashes in the test tube.
Chemistry experiment 17 - Silver and gold colored coin koen2all 2013-04-01 | In this electrochemical reaction a copper coin is zinc plated. After heating the coin, a gold colored alloy called brass is formed.
Chemistry experiment 16 - Silver mirror koen2all 2013-03-14 | Classic chemistry experiment. Formation of a silver mirror on the inside of a test tube.
Chemistry experiment 15 - Explosive mix koen2all 2013-03-06 | When mixing a tiny amount of red phosphorus with potassium chlorate, a highly sensitive explosive mix is obtained. NEVER scale up this experiment!
Chemistry experiment 14 - Reaction between iodine and zinc koen2all 2013-03-02 | The exothermic reaction between iodine and zinc.
Chemistry experiment 13 - Hydrogen balloon koen2all 2009-02-27 | A balloon filled with hydrogen gas is lit.
Chemistry experiment 12 - Thermal decomposition (thermolysis) koen2all 2009-01-29 | Thermal decomposition of sugar, ammonium dichromate and ammonium trichromate.
