Which gas laws applies to the flight of a hot air ballon

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

Which of these conditions most likely produces an unstable isotope?

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)