What of these processes is a chemical change, not a physical change? 1. the burning of a match 2. the boiling of mercury 3. the dissolving of salt in water 4. melting ice 5. the breaking of a pencil?

A chemical change is one where the compounds are modified: a compound decomposes into its elements, or combine with other elements to form a different compound.

That is what happens when a match burns: oxygen reacts with the match compounds and form CO2(g), H2O(g) and other compounds depending on the composition of the match.

The other processes only involve a physical change of the compounds, but they remain being the same compounds (same elements with the same bonds).

Answser: option 1. the burning of a match.

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

B.) falsehope this !