Phosphorus pentafluoride is a known toxic, colorless gas while nitrogen pentafluoride is only a
theoretical compound. Justify this statement. Use your knowledge about the octet rule, its
exceptions and atomic orbitals in your explanation

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.