Ligas metálicas são uniões de dois ou mais metais, podendo ainda incluir semimetais ou não metais, mas sempre com predominância dos
elementos metálicos. Considere as seguintes ligas: aço; bronze; ouro 14
quilates e latão e indique os elementos predominantes em cada uma delas.

the dissolution of polymer can be thermodynamically described in 2 steps.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

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.