Many scientists are studying tiny particles called nanoparticles, Which best describes how the scientists are probably trying to learn about these
particles?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

Describe the forces both attractive and repulsive that occur as two atoms move closer together.