Yes, it is normal.
Yes, this water is evaporated.
Yes, fluoride can evaporate from water when it is heated.
Steam
Evaporate?
It evaporates
At higher temperature the continuous movement of water molecules is accelerated.
This is not true.
Copper sulfate solution does evaporate when heated. As the solution is heated, the water molecules in the solution gain enough energy to overcome the intermolecular forces holding them in the liquid state, and hence evaporate into the air, leaving behind solid copper sulfate crystals.
Yes, it is true.
Indoor the temperature is higher.
Eventually if heated long enough (and hot enough) all the water would either eat the world or MELT (turning into steam), leaving behind nothing but solid salt behind. This is one way that you can remove salt from sea water in fact.
When water is heated a physical change may take place. The water may evaporate and become water vapor, but the chemical makeup of the water (H2O) will not change.