Is " energy created " an endothermic reaction or an exothermic reaction?

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.

If many scientists conduct the same or similar experiments, and all obtain similar results, a can be written, which is a generally agreed-upon statement that explains and predicts how a natural phenomenon works.

An unknown substance has been shown to have weak covalent bonds. which of the following is most likely a property of this substance? a. high ph b. high conductivity c. low melting point d. low flammability