The mass ratio of lead to sulfur in lead(II) sulfide is 270.0 g lead to 41.8 g sulfur. How much lead is required
to completely react with 85.6 g of sulfur?

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.)

Which of the following is true about the speed of light? it depends on the wavelength.

Which subshell is represented by the actinides family?