Which is a heterogeneous mixture a jar of nuts

Compare and contrast physical changes with chemical changes.

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)

How many moles of bromine are needed to produce 3.23 moles of potassium bromide