1. Hang a pen by a piece of string.
Q4. Is the pen at rest or in motion?

Achemistry student needs of 40ml diethylamine for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of diethylamine is 0.7 . calculate the mass of diethylamine the student should weigh out. round your answer to significant digits.

What structural formula represents 4 electrons shared between two atoms?

Explain how a step-down transformer makes electricity safe for use in homes