Before the discovery of the microscope, Linnaeus could classify organisms only into two kingdoms. More kingdoms were introduced later. What characteristic of science does this show? It is permanent.
It is changeable.
It is always accurate.
It is based on predictions.

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?

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.)

Calculate the number of moles of ethane in 100 grams