A scientist combines oxygen and hydrogeh to form water. That combination illustrates that water is a O an atom
O a mixture
O an element
O a compound

According to the diagram; a) identify the anode of the cell and write the half-reaction that occurs there b) write the overall equation for the reaction that occurs as the cell operates c) calculate the value of the standard cell potential ,e cell. d)write the shorthand notation of the cell above e)indicate the flow of the electrons on the diagram

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What is a number added in front of a formula in order to balance the equation