Which of the following is the best definition of a physical property? A. Something that can be observed or measured while changing the identity of the substance.
B. Tearing paper in half.
C. Something that can be observed or measured without changing the identity of the substance.
D. The ability of something to undergo a change or reaction.

The real answer is keeping the world healthy so we won’t die

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