The hydronium ion concentration of a dilute solution of vinegar is 1.45 x 10-5. what is the ph of this solution

What must occur for air masses to form fronts

Which terms are used to identify pure substances

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)