When wood is burned is this a physical or chemical change ?

Mercury turns to vapor at 629.88 k how much heat is lost 175 g of mercury vapor at 650 current condenses to a liquid at 297 ca mercury turns to weber at 629.88 kelvin how much he is lost 175 g of mercury vapor and 650 coming condensers to liquidate 297 kevin

What is the mass of oxygen gas is consumed in a reaction that produces 4.60mol so2

Calculate the concentration of all species in a 0.165 m solution of h2co3.