Final answer:
True, some chemical reactions release energy (exergonic), while others absorb energy (endergonic). Exergonic reactions include burning fuel, whereas endergonic reactions include photosynthesis. This balance adheres to the law of conservation of energy.
Step-by-step explanation:
The statement that some chemical reactions release energy while others store energy is true. Chemical reactions that release more energy than they absorb are called exergonic reactions, such as the catabolism of foods. These reactions may release energy as heat or light and are involved in everyday processes, like when methane gas burns in a kitchen burner.
On the other hand, chemical reactions that absorb more energy than they release are known as endergonic reactions. These reactions require an energy input and are critical for processes like photosynthesis. This energy can come from the energy released during exergonic reactions, adhering to the law of conservation of energy, which states that energy is neither created nor destroyed.