You do 1200J of work with gears. If the gears do 1000J of work, what is the efficiency of the gears?

This did i unseated, sorry

Answershe should not have multiplied the sulfur atoms by the subscript 4

The chemical reactions lab we did is typically called a "copper plating lab,  because the acid solution cleaned the pennies and made the copper look shinier;   the acid solution cleaned the paperclips and made them look like pennies;   &   the copper from the pennies was removed, and then added to the paperclips.