The diagram below represents a closed system using a flask with a balloon attached. In the flask, a chemical reaction between solid baking soda and hydrochloric acid is occurring. The balloon has inflated as products have formed from the reaction. Balloon
Flask
Hydrochloric acid
Solid baking soda
(Not drawn to scale)
Which evidence in the diagram indicates that a gas was produced as a result of the reaction?

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

Sorry i dont understand the question can you rephase it?