1) Which of these processes represents a decrease in entropy? a) Dissolving gas in water. b) Boiling water. c) Sublimation of CO2. d) Melting of ice. 2) Entropy increases from solid, liquid to gas. Why? a) Molecular disorder increases. b) Molecules increase in number from solid to gas. c) Molecules are heavier in solid. d) Molecules are more reactive. 3) What is a spontaneous process ? a) Process that does not need external intervention to occur. b) Slow process. c) Process that needs an external intervention to occur. d) Fast process. 4) Entropy of a system increases when a reaction increases the number of particles. a) True b) False 5) The following statements are true for entropy EXCEPT: a) Lowering the temperature causes entropy to increase. b) Entropy is the measure of molecular disorder. c) Gases have more entropy than liquids of the same substance.. d) Entropy is greater if matter is more dispersed. 6) The reaction is spontaneous when... a) Entropy is positive and enthalpy is negative b) Entropy is positive and enthalpy is positive c) Entropy is negative and enthalpy is negative d) Entropy is negative and enthalpy is positive 7) Enthalpy is equal to a) change in times b) change in activation energy of products and reactants c) change in potential energy of products and reactants d) Change in ratio of products and reactants 8) Exothermic reactions have a) negative Entropy b) negative Enthalpy c) positive Entropy d) positive Enthalpy

Enthalpy and Entropy.

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