What do the symbols in parenthesis indicate? cacl2(aq) + 2agno3(aq) → ca(no3)2(aq) + 2agcl(s) the catalyst used in the reaction the number of atoms of each reactant and product the physical state of each reactant and product the number of units of each reactant and product

The physical state of each reactant and product

Temperature and pressure

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na