Entropy-a measure of the randomness , disorder, messiness of a “system” “system” what you are looking at- a reaction in a beaker, a phase change, your notebook, your room etc the greater the disorder, the better, and the higher the _________________ Symbol: S = change in entropy Keeping the E words straight: entHalpy has an H so its H, no H in entropy so it’s S In questions, it is often easier to answer if your replace the words with the symbols (H & S) **Nature favors low energy __________ and high disorder _____________** It is expected that systems will often go from conditions of greater order (low entropy) to conditions of greater disorder (high entropy) Higher the Temperature, the greater the entropy! NaCl(s) + H2O(l) NaCl (aq) S = ___________ HCl(g) + H2O(l) HCl (aq) S = ___________ 2 Mg (s) + O2 (g) 2 MgO (s) S = ___________
Entropy-a measure of the randomness , disorder, messiness of a “system” “system” what you are looking at- a reaction in a beaker, a phase change, your notebook, your room etc the greater the disorder, the better, and the higher the _________________ Symbol: S = change in entropy Keeping the E words straight: entHalpy has an H so its H, no H in entropy so it’s S In questions, it is often easier to answer if your replace the words with the symbols (H & S) **Nature favors low energy __________ and high disorder _____________** It is expected that systems will often go from conditions of greater order (low entropy) to conditions of greater disorder (high entropy) Higher the Temperature, the greater the entropy! NaCl(s) + H2O(l) NaCl (aq) S = ___________ HCl(g) + H2O(l) HCl (aq) S = ___________ 2 Mg (s) + O2 (g) 2 MgO (s) S = ___________