All parts of your message must be connected in one continuous line of ink. Your message will be invisible, so I hope you know where it started! Longer messages take a while to reveal themselves, so be patient.
With older students, the demonstration could be used to revise the equations for the decomposition of nitrates. I imagine that any molecule containing tetravalent oxygen might be highly explosive but perhaps this is a way of putting off potential makers of homemade explosives by printing the wrong formula! From Trevor Kletz I recently spotted an error in a chemistry newsletter where carbon dioxide was described as inflammable. This collection of over practical activities demonstrates a wide range of chemical concepts and processes. What secret messages will you write?
You can find ammonium nitrate in many types of instant cold packs, while potassium chloride is available in "lite" salts. It is housed in a polished wooden and glass case and is in good condition although the glass in the top cover is cracked.
You want to start the message or design at the edge of the paper.
However, they are used by the Intergovernmental panel on climate change and climatologists to indicate the concentrations of gases in the atmosphere.
If you need assistance, start a thread in the forum or message me personally. This word does not mean non-flammable, but able to catch fire or inflame. Richard Brown states that parts per million by volume ppmv are not part of the SI system of units Chemistry World, December , p Fireworks and the chemicals contained within them are dangerous and should always be handled with care and used with common sense.
Low reactivity is the obvious characteristic of the whole group. The potassium nitrate embedded in the paper will smoulder and burn away your ink in the pattern of your secret message. If anybody would like it they are welcome to have it free of charge provided they can arrange for its collection.
On the other hand, the inertness of these elements, compared with the reactivity of their neighbours in the periodic table, provides some of the most dramatic contrasts in the whole of chemistry. Only a gas-cooled reactor is free from such objections. The providers of this content specifically do not condone using fireworks for disruptive, unsafe, illegal, or destructive purposes. You can scratch a message into a piece of paper with this invisible ink, and then take a match to the paper and let the ink burn, etching your message into the paper. However great the claims made for such designs, they all carry the risk of a disastrous pressure rise in the event of overheating, because of the phase change from water to steam.
Wear eye protection. It can be helpful to make a small mark with a pencil. Touch the edge of the paper, where the invisible message started with the flame of a lighter. If you need assistance, start a thread in the forum or message me personally. Step 4 Light the Message In a nonflammable environment, outdoors away from sentient creatures, bring a flame to the edge of the paper where your secret message begins.
The fact that radioactive pollutant release was minimal at Three Mile Island and disastrous at Chernobyl was entirely due to the presence of an effective containment vessel at Three Mile Island and its absence at Chernobyl. This experiment could be used to introduce the fire triangle: fuel, oxygen and energy.