In the conversion of pyruvate (CH3COCOO-) to oxaloacetate (-OOCCOCH2COO-) the other reactants are carbon dioxide, water, and ATP. In this reaction the removal of a phosphate ion from ATP is called a coupled reaction. What does that mean

The correct answer should be "electrons orbit the nucleus in circular motions exactly as shown on the classic bohr model."

The answer would be solvent

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.