Good chemistry question

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)

Use the periodic table to determine how many grams of oxygen would be required to react completely with 859.0 g c2h2

What are the two basic types of satellites