An excess amount of oxygen reacts with 459.2 grams of lead. Only 350 g of lead (ll) oxide are formed

Why do sodium and neon have vastly different chemical and physical properties despite having similar atomic masses?

Stage in which a typical star has completely stopped fusion

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