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Regents Warm-Up

Regents Warm-Up. Which two characteristics are associated with metals? (1) low first ionization energy and low electronegativity (2) low first ionization energy and high electronegativity (3) high first ionization energy and low electronegativity

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Regents Warm-Up

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  1. Regents Warm-Up Which two characteristics are associated with metals? (1) low first ionization energy and low electronegativity (2) low first ionization energy and high electronegativity (3) high first ionization energy and low electronegativity (4) high first ionization energy and high electronegativity

  2. AIM: What is ENTROPY? DO NOW: What are the oxidation #s in HOBr KClO3 ENTROPY

  3. ENTROPY (DS): a measure of the randomness or disorder in a system. A system with more disorder has a greater entropy What are some examples of entropy? ENTROPY

  4. Phase changes are changes in the entropy of the molecules solidliquidgas ------ENTROPY Entropy increases as disorder of molecules increases ENTROPY

  5. Changes occur so the highest possible entropy is reached. Increases in entropy favor SPONTANEOUS RXNS Does dissolving a gas in a liquid (soda) increase or decrease entropy? This causes a i in entropy For a reaction, when the amt of gas being produced h the overall entropy will h Example: SO3(g)  2SO2(g) + O2(g) Solutions h in entropy when something is added h in temp will h entropy ENTROPY

  6. Which sample has the greatest entropy? 1. NH3(g) 2. NH3(s) 3. NH3(l) 4. NH3(aq) Which process is accompanied by a decrease in entropy? 1. boiling of water 2. subliming of iodine 3. condensing of water vapor 4. melting of ice ENTROPY

  7. Entropy h when: a solid becomes a gas a solid becomes a liquid a liquid becomes a gas Something is broken into smaller pieces In our bodies the desire to become disordered is counteracted by all the energy and heat we produce Therefore, changes in entropy(DS) and enthalpy (DH) can tell us if a reaction will be spontaneous ENTROPY

  8. A system tends to change toward lower enthalphy and higher entropy Spontaneous reactions occur naturally and favor product formation Some reactions may depend on conditions for example: C6H12O6(s) CO2(g)+H2O(g) Some endothermic reactions are spontaneous due to an h in entropy (ex. ice melting) h in entropy favors spontaneous reactions ENTROPY

  9. As carbon dioxide sublimes, its entropy 1. decreases 2. Increases 3. remains the same Which sample has the lowest entropy? KNO3(l) KNO3(s) H2O(l) H2O(g) ENTROPY

  10. At STP, a sample of which element has the highest entropy? 1. Na(s) 2. Br2(l) 3. Hg(l) 4. F2(g) Which list of the phases of H2O is arranged in order of increasing entropy? 1. ice, steam, and liquid water 2. steam, liquid water, and ice 3. ice, liquid water, and steam 4. steam, ice, and liquid water ENTROPY

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