Which of the following scenarios is a chemical reaction NOT taking place. Bobby notices that his bike rusted when left out in the rain over night. Ann notices that the bread turned green over a long amount of time.

Timmy dissolves salt in warm water.

Betty colors her hair blond with bleach.

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

How is the use of hydroelectric power related to the sun

Two liquids are poured into a beaker. after a few seconds, the beaker becomes warm. which of the following best describes this reaction? a. an exothermic reaction b. a decomposition reaction c. an endothermic reaction d. a single-displacement reaction