In the Laboratory a student combines 41.3 mL of a 0.304 M barium chloride solution with 24.7 mL of a 0.444 M barium acetate solution. What is the final concentration of barium cation?

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 are isotopes of the same element alike?