True or false: a chemical formula is a representation of the smallest unit of a compound

This drawing shows a human body system. what is the primary function of this body system?

How might this scientific phenomena be explained? a paper clip floats on water.

Calculate the ph at the equivalence point for the titration of a solution containing 150.0 mg of ethylamine (c2h5nh2) with 0.1000 m hcl solution. the volume of the solution at the equivalence point is 250.0 ml. kb forethylamine is 4.7 × 10−4 .