Which of the following is not a measurement? 0.50 ppm

120

65 mph

24°C

The second one is the answer. 120 is not a measurement. it’s just a number

The second one !! it’s just a number without actually measuring anything

It’s the energy source of stars

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