What is the chemical name for NH4?​

If a solution had a ph of 7 what is the solution

Word equation for k(s)+h2o(l) yield koh(aq) + h2(g)

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)