How many moles of hydrogen are priduced frim the reaction of three moles of zinc with an excess of hcl?
zn+2hcl-zncl2+h2

An observation that requires measurement is called quantitative observable or qualitative

If a solution had a ph of 7 what is the solution

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.