You put a piece of colored film on top of the light to get a different color. It could also work with tissue paper because of its thinness.
The can will be colder than everything around it presumably. So heat from the air and the table will warm the can over a few hours, until eventually the table, air, and can are at the same tenperature.
Answer:
They are called downbursts.
The are eight hydrogen atoms in ammonium sulfide because there are 2 molecules of ammonium.
