How does the mechanical energy of a rock change as it falls from a mountain? A The mechanical energy remains the same because kinetic energy is changed into potential energy.

B The mechanical energy remains the same because potential energy is changed into kinetic energy.

C The mechanical energy increases because the kinetic energy is changed into speed, while the potential energy remains the same.

DThe mechanical energy increases because the potential energy is changed into acceleration, while the kinetic energy remains the same.​

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chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.

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