You are presented with four chemical compounds. Each compound contains a different metal. When the compound is heated in a flame a distinct color is emitted as the electrons are excited and give off different wavelengths of light. Determine the unknown compound based on the data table and photo.

Density 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

Wow that a lot of text for my tiny so i no wanna answer