Explain what is meant by the atomic mass unit (amu)?

Mass of one proton 1.67×10^27kg is known as amu and is approximately equals to mass of 1 nuetron

Answers are 1,2,4 its correct on edgenuity.

In reversible reaction chemistry equilibrium is attained when the forward and reverse reactions are taking place at the same rate, thus, the concentrations of reactants and products remain the same. a reversible reaction is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back. in irreversible reactions on the other hand, the reactants react to form the products, which cannot revert back into reactants.