If the atmosphere is like a greenhouse, what part of it function as the 'glass'

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!

When the water vapor cools it condenses select a number that represents his process on the

In a heat of an engine, if 700 j enters the system, and the piston does 400 j of work what is the final internal (thermal) energy of the system if the initial energy is 1,500 j