How do the horizontal portions of the graph represent? When heat is added or removed from the substance and the temperature stays the same, where is the thermal energy going, Why?

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)

Which of these is an intensive property of a substance

Ineed in question 5and6 in science the subject is science