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The average kinetic energy of water molecules decreases when

June 2017 NY Regents Chemistry Exam


15 The average kinetic energy of water molecules decreases when (1) H2O(l) at 337 K changes to H2O(l) at 300. K

(2) H2O(l) at 373 K changes to H2O(g) at 373 K

(3) H2O(s) at 200. K changes to H2O(s) at 237 K

(4) H2O(s) at 273 K changes to H2O(l) at 273 K


Solution: Temperature is the measure of the aver kinetic energy. So the question is asking us in which of the following does the temperature decrease.

Answer: 1


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