What change was made to the Mendeleev’s early Periodic Table? (How is it currently organized? A.
They used atomic mass instead of atomic number to organize the elements.

B.
They included chemical properties such as bonding power.

C.
They included physical properties such as melting point and density.

D.
They used atomic number instead of atomic mass to organize the elements.

Ineed ! i have no clue how to do this problem.

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.

Which process results in the release of energy stored in the products of photosynthesis? a. polymer synthesis b. depolymerization c. digestion d. cellular respiration