higher energy.

Which of two objects or substances has the higher energy. Explain the answer with reference to the capacity of each to do work and say whether the energy that distinguishes them is kinetic energy or potential energy.

a. (1) A methane molecule, CH4, in the stratosphere or (2) a CH3 molecule and a hydrogen atom formed from breaking one of the carbon‑hydrogen bonds in a CH4 molecule.

b. (1) A water molecule moving at 1.63 ×10^3 mi/h or (2) the same water molecule moving at 1.81 ×10^3 mi/h. (These are the average velocities of water molecules at 110 °C and 200° C.)

c. (1) Iodine solid or (2) iodine gas. (Assume that the two systems are at the same temperature.)

d. (1) A nitrogen monoxide, NO, molecule and an oxygen atom in the stratosphere or (2) the NO2 molecule that can form when they collide.

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