Write the chemical equations showing the dissolution of sodium chloride, naphthalene C10H8, potassium phosphate, and calcium chloride. The first one has been done for you as an example.
NaCl H2O Na+ + Cl-
C10H8+H20--->10C-4 +8h+
K3PO4+H2O--->(3K+)+1PO4-3
CaCl2+H2O--->Ca(2+)+2Cl-

If an equal molar amount of each solute in the above was dissolved in 100 kg of water, which solute would cause the largest change in temperature? Explain your answer.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.