1 Which of the following is the best comparison of metals and nonmetals? a. Nonmetals are more brittle as a solid. b. Metals are better electrical and heat conductors. c. Nonmetals are more ductile as a solid. d. Nonmetals are better conductors of heat. ​

The mass has escaped into a gas which you can not see so the law stays true.

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