Which statement describes a chemical property of silicon?

(1) Silicon has a blue-gray color.
(2) Silicon melts at 1414 C.
(3) Silicon reacts with fluorine.
(4) Silicon is a brittle solid at 20."C.

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)