9/3/2023 0 Comments Entropy chemistry![]() ![]() We saw above how entropy changes during physical changes like changes of state or preparing solutions. Take the test now! Entropy and Chemical Reactions ![]() ![]() The distribution of energy in the solid sodium chloride lattice is lower than it is in the aqueous solution where the ions are constantly moving, so the entropy of the sodium chloride system has increased. The sodium chloride system has gone from a highly ordered, low entropy state, to a less ordered, higher entropy state. The solid sodium chloride breaks up into sodium ions (Na + (aq)) and chloride ions (Cl - (aq)) which can move freely within the body of liquid water, making an aqueous solution of ions. Then you would add some liquid water (the solvent). All the ions are held together by ionic bonds forming a 3-dimensional lattice of ions (an ionic solid). Solid sodium chloride is in a low entropy state. Let's think about what happens when you make an aqueous solution of sodium chloride (NaCl (aq)).įirst, you would weigh out some solid sodium chloride (NaCl (s)) which is the solute. The entropy of the liquid system is greater than that of the solid but less than that of a gas. The amount of disorder in a liquid system is greater than that of the solid, but less than that of the gas.īecause the moving particles in the liquid are free to move within the body of liquid the energy distribution within the liquid is greater than that of the solid.īecause the moving particles in the liquid are confined and not free to move outside the body of the liquid, the energy distribution for the liquid system is not as great as that for the gas system. The particles in a liquid can roll over each, so the particles in a liquid are more disordered than those in the solid, but the particles in the liquid cannot move around as freely as in a gas, so the particles in the liquid system are not as disordered as they are in the gas system. If you consider the particles making up a liquid, we would say that they have more kinetic energy than those in the solid, but less kinetic energy than those in the gas. We say that the entropy of the system is high.īecause the particles are constantly moving they have greater kinetic energy than they did when they formed part of a solid, and because they are being scattered in different directions the distribution of energy in this system is higher than it is for the solid system, therefore the entropy of the system is higher. The particles bump into each other and the walls of the container, constantly changing direction so the particles in the system are highly disordered. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |