Look at the velocity vs. time graph. During which time interval is the cart moving up the track while freely rolling?

Answerthe valence of an element or radical is equal to the number of positive or negative charges on the ion.

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. 

Idont see the picture but if you message me i can you

The cell reaction uses external supplies of a full and an oxidant, which are consumed and needs to be provided continuously. the cell will continue to provide electrical energy so long as there is a supply of fuel and oxidant.  hope this ! (: