The Newton is the SI unit for .
temperature
density
weight
mass

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

Nonpoint source pollution is difficult to control because it