2. What is the half-life of the dimes according to the graph? (The half-life will be indicated by the number of throws.)

Can someone me with these questions plz.

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.