i want to perform UV visible spectrophotometric analysis of a compound but i can not find standard protocol for that particular compound. what should i do

Given sno2 + 2h2 - sn + 2h20 tin oxide reacts with hydrogen to produce tin and water. how many moles of sno2 are needed to produce 500.0 grams of sn?

Astring vibrates with a frequency of 10 hz. why can't a person hear the sound waves produced by the vibrating string, no matter how large the amplitude of the waves? out! this is homework and due tomorrow! you so much!

Draw the aromatic compound toluene (methylbenzene). show all hydrogen atoms, including those on the ring.