Ablock of wood has a mass of 180 grams it is 10.0cm long , 6.0cm wide and 4.0cm thick what is the volume and density

The formula to find the volume is V = LHW, so here we got the thickness instead of the Weight, it's the same ig
So 

The formula to find the density is 
So  (Always remember that Density have no unity)

Hope this Helps :D 

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

Ineed with this also i hope you understand it