Describe how atmospheric pressure changes altitude increases

What’s #16 asking me and how do i solve it?

What structural formula represents 4 electrons shared between two atoms?

In this thread, i would like you to comment on the nature of light and how operation of telescopes. light has a duality of a particle and a wave; which one affects your life? also how does light interact with optics inside telescopic systems? answer these questions in two paragraphs. then respond the another students response.