Phosphoric acid (H3PO4) is an important industrial chemical used in fertilizers, detergents, and the food industry. It is produced by two different methods. In the electric furnace method, elemental phosphorus (P4) is burned in air to form P4O10, which is then combined with water to give H3PO4. In the wet process, the mineral phosphate rock [Ca5(PO4)3F] is combined with sulfuric acid to give H3PO4 (and HF and CaSO4).
(A) Write the balanced equations for the electric furnace method. Include the phase abbreviations.
1) First reaction: (Assume P4 is a solid) + classify the step (precipitation, acid-base, redox, or combination)
2) Second Reaction + classify the step
(B) Write the balanced equation for the wet process. Include the phase abbreviations + classify the step.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

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.  

gas and precipitate r the correct answers