What are two different types of electron microscopes and how might their ability to observe a specimen he different?

transmission EM (TEM) and the scanning EM (SEM)

Explanation:

Electron microscopy (EM) is a technique for obtaining high resolution images of biological and non-biological samples. It is used in biomedical research to examine the detailed structure of tissues, cells, organs and gross cell bodies.

There are two main type of electron microscope

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.