the pupil weighed 2.8g of iron and 1.44g of sulfur powder. the materials were thoroughly mixed, sprinkled on a steel plate, and began to wait for the reaction to begin. However, it did not take place at room temperature. Why?

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

257 grams h2o i think

Answer earth,water,fire and air;

Hcn is your answer my guy : )