Explanation:
If bunsen burner gave a luminous flame then there will deposition of soot at the bottom of the test tube which is actually pure carbon.
This deposition of soot actually depicts that there is incomplete combustion reaction that has taken place.
Also, the deposition of soot will provide a limited supply of oxygen to the reaction that has been calculated.
Therefore, in order to avoid any formation of soot it is advisable to adjust the burner flame till it produces a blue flame.
The carrot myth was invented by the English Airforce to hide their radar system during WW(1 or 2, I'm not sure). Dropped food doesn't matter because dust and bacteria the food touches are on it the moment it hits the ground. Touching toads doesn't give warts, however the poison he secretes from its skin (a toad is poisonous, not venomous) can irritate. So it must the warm milk.
Solid liquid and gas
when it changes from a:
solid
to a
liquid: melting, fusion
gas: sublimation
liquid
to a
solid:freezing
gas:vaporization
gas
to a
solid:condensation, deposition
liquid: condensation, liquefacation
