1. A 250-ul sample is needed from a sterile vessel that is too thin to use with anything but a sterile pipet. Which pipet and pipet pump could be used to withdraw the mL equivalent of 250 uL from the
vessel?

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3 -> a2cr(no3)3 + a3ag2so4

One nanometer is equal to how many meters?

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.