How long is radioactive waste from nuclear plants radioactive? 1.) 100,000 years
2.) 10,000 years
3.) 100 years
4.) 1,000 years

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.)

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

Which of the following units is not an official si unit? mole liter kilogram ampere