When you add heat to an iron nail it will get hot. If enough heat energy is added the nail could melt.
It rusts (corrodes).
It get hotter and if it is frozen it melts. If it is melted it boils.
Alloys can add heat resistance to a metal
A nail set is used to sink the nail into the wood as oppose to having the nail sit flush with the wood. Usually after using the nail set and driving the nail into the wood, one would take wood putty and fill the hole so the nail would be "invisible" to the naked eye.
because the object needs also to heat up
I will assume you are referring to a normal iron or steel nail. Such a nail will tend to oxidize (rust) whenever there is oxygen present. Submerging a nail in water will not deprive it from a source of oxygen. Generally speaking, water is a solution of H2O and a wide variety of chemical compounds that are in solution with it. Among these, and prominently so, are the gasses that comprise the atmosphere, including oxygen. This oxygen will readily combine with the iron in the nail to form rust. In fact, other compounds within the water may cause the reaction to occur more or less quickly than it would in the air. It is incredible how much gas is dissolved within water. Imagine a large pot of tap water on the stove. As it heats, bubbles begin to form on the sides, then collect together and rise to the surface. These bubbles are not bubbles of steam (gaseous water) like many people think, but dissolved air being forced out of the water. There are a lot of bubbles. Imagine how much air you would have if you could collect all the bubbles.
and add it to water
The iron and sulphur split because the iron sinks and the sulphur floats so you can separate the mixture
1. Iron sulfate is formed. 2. The released copper is deposited on the surface of the iron piece.
I goes all gloppy and odd
Acetone molecules evaporate when you add heat to a beaker of liquid acetone.
When you add heat to liquid water it gets warm. If it gets warm enough it will boil and evaporate.
a grey precipitate of iron and a colourless solution.
The balloon expands.
BOOM.
I would just add a few drops of nail polish remover. It has worked for me! Just add a few drops of nail polish remover into the drying nail polish and give it a few good shakes!
Nothing. Copper is lower than iron in the electromotive series and will not replace the iron in the iron nitrate solution.
Copper will "plate" on to the outside of the nail. The observer will see a copper colored material on the nail that looks almost like rust when dry. Fe + CuSO4 → FeSO4 + Cu Copper precipitates onto the nail.