What chemical to use to clean tin?

What does distillation require? How can you tell the number of protons and neutrons in its nucleus? What do we call a group of organs which work together to carry out particular function? What is bitmen? When an atom gains an electron is it an isotope? Dentin is a soft substance than the enamel on a tooth and is found under the enamel? Time difference between India and Montreal? What is the unit weight of Fe 500 and Fe450? Where is superior and inferior arcuate line of glottis? How much is 5 minutes on Mars? What is the formula to find how many hydrogen atoms are in a moles? What is it called when your body shivers from coldness? What structures allow genetic material to pass through the nuclear membrane? Is a star's outer layer hot and dense? What are response variable? How are ions which may never settle carried by water? How can a substance be frozen at room temperature? What three dimensional shape are elodea cells? What are the activities that are common to all cellular life? If good why do you yield to that suggestion?