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Energy in Reactions assignment Name: 120 1. During exothermic reactions:[1] a. heat is transformed into potential energy b. kinetic energy is transformed into bond energy c. potential energy is transformed into bond energy d. potential energy is transformed into kinetic energy 2. Which of the following are chemical changes? (10) a. mercury has a density of 13600 kg/m3 b. potassium reacts with water C. hammer a nail into a piece of wood d. a rotting apple e. potassium is a soft metal f. evaporation of water g. sublimation of dry ice h. dissolve sugar in water i. a growing flower j. hydrogen is a flammable gas 3. State which law of thermodynamics each statement corresponds to. [2] a. "A system can never reach a temperature of O K." b. "Heat will never of itself flow from a cold object to a hot object." C. "Whenever heat is added to a system, it transforms to an equal amount of some other form of energy