Which among the following represents a set of isotopes? Atomic nuclei that contain: I) 10 protons and 10 neutrons
II) 11 protons and 11 neutrons
III) 10 protons and 11 neutrons
IV) 11 protons and 12 neutrons
V) 11 protons and 10 neutrons

An observation that requires measurement is called quantitative observable or qualitative

Why do cells appear different in distilled water than they do in 10% salt water?

Liquid ammonia is produced at high temperatures and under great pressure in a tank by passing a mixture of nitrogen gas and hydrogen gas over an iron catalyst. the reaction is represented by the following equation. n2(g) + 3h2(g) → 2nh3(g) changing all but one experimental condition will affect the amount of ammonia produced. that condition is a) increasing the concentration of both reactants b) changing the temperature within the tank c) decreasing the pressure within the tank. d) increasing only the amount of nitrogen present.