Which of the following is the best description of convection? a. heat transfer in a gas or liquid by the circulation of currents from one region to another b. the emission of energy in the form of rays or waves that are able to travel through empty space c. the process of changing from a gas to a liquid or from a liquid to a gas d. the transmission of heat through a medium without the motion of the medium

Convection- heat transfer in a gas or liquid by the circulation of currents from one region to another; A

Bthe s the

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