Which of the following is true with respect to energy in a closed system? A.
Energy can be destroyed, but cannot be created.
.
Energy can be created, but cannot be destroyed.
B.

C. The system's kinetic energy must equal its potential energy.
D.
The total amount of energy in the system always stays the same.

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