modify true or false please do 3&4&5&6

3. In a zine-copper galvanic oell, the zinc electrode will decrease in mass. 4. A positive value for the oell potential means that the cell reaction occurs spontaneounly. 5. The standard half-cell reduction potential indicates the tendency of a half-cell to lose electrons. 6. A spontancous redax reaction occurs only if the oxidiring agent is above the reducing agent in the table of standard reduction potentials