4 Movement of less dense material
3 Heating of cooler material
1 cooling of warmer material
2 movement of denser material
Balanced chemical reaction: 2KCl + Pb(NO₃)₂ → PbCl₂ + 2KNO₃.
According to principle of mass conservation, number of atoms must be equal on both side of balanced chemical reaction.
KCl is potassium chloride.
Pb(NO₃)₂ is lead(II) nitrate.
KNO₃ is potassium nitrate.
PbCl₂ is lead(II) chloride.
It would be A, the molecules should be closely packed together but arranged randomly. :)
