What is the work when a gas expands from 0.666 L to 2.334 L against an external pressure of 2.07 atm?

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

#7 how does the structure of amino acids allow them to form a polypeptide? each amino acid has an amino group and a carboxyl group. each amino acid has a hydrogen atom and a carboxyl group. each amino acid has a carboxyl group and an r group. each amino acid has an r group and a hydrogen atom.