determind in the cost in pennies required to make one 2.500 g penny using the Gold ($1,675.00/troy oz, 1 troy oz = 0.0311034 kg)

After cloud droplets form, what must happen to them for precipitation to occur?

Check the correct box to describe the periodic trends in electronegativity. electronegativity across a period: decreases. increases. electronegativity down a group: decreases. increases.

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.)