Invisible ink

Make your own invisible ink Invisible ink has been used by spies for centuries. At the time of the Revolutionary War, invisible ink made of a mixture of ferrous sulfate and water was commonly used. The secret messages were often written in between the lines of a normal letter. When heat or a special chemical (such as sodium carbonate) were applied, the message that was placed in between the lines would appear. In modern times, inks containing special properties are used and require viewing under ultraviolet (UV) light to see the message. Put some lemon juice in a bowl and mix with a few drops of water Wet a cotton ball and use it to write a message on a blank piece of white paper Wait for the “ink”

Lemon battery experiment – if life gives you lemons, make a battery!

Lemon battery Batteries store chemical energy that can be transmitted as electrical energy through various components in a circuit. You can think of the circuit as the path the electrons (electricity) take. The path has to have no breaks in it and it much be a path made of a material that will allow the electrons to flow (e.g. most metals although some are better conductors than others). Batteries, such as the one we are about to build, have electrodes, or the connection points on the battery. The anode is the electrode at which electrons leave the cell and oxidation occurs, and the cathode is the electrode at which electrons enter the cell and reduction occurs. In our battery, the lemon juice acts as the electrolyte which