A rock rolls down a hill. Which form of energy is this an example of? Chemical
Electrical
Mechanical
Thermal

Which one of the following gases is not an important component of soil?

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.

How do you know when a chemical reaction has occurred