Describe two observations you might make when a chemical change occurs

Which substance has non polar covalent bonds

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)

What is the oxidation state of an individual bromine atom in nabro3?