I don't mean little battery fire alarms in every house/aptmt, but the fire alarms that go off at apartment complexes or office buildings: how do firefighters turn them off? Is there a keypad or do they use a key?If someone were to pull the fire alarm handle, how are those reset, or are they usually replaced? What if they are the kind that leave invisible ink or black light powder (if these exist)?Do laboratories around the world create the annoying sounds of a fire alarm and choose them by how well they pierce buildings and annoy everyone?Has a fire alarm ever gone off right after the poor construction worker installed it? Or are they installed by the fire district specialists?
when you play domino's be sure to wear a helmet safety glove padding a good boots as it is a very rough game lol
Thioacetamide is used to generate sulfide ion which reacts with the Pb^2+ and precipitates as a solid. It is one way to test for the presence of lead. It can be used instead of H2S. H2S has a foul odor and is toxic. Thioacetamide is much safer to use. The Group II ions are separated from those in Group III by adding hydrogen sulfide to the mixture in acidic solution. We use an organic precursor, thioacetamide (CH3CSNH2), which decomposes to hydrogen sulfide in the presence of acid according to the net reaction: CH3CSNH2 + 2 H2O CH3CO2^- + NH4^+ + H2S The Group II ions precipitate as sulfides on reaction with S^2- from H2S.
