What are memory B cells and memory T cell

Problem page gaseous ethane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water . if of water is produced from the reaction of of ethane and of oxygen gas, calculate the percent yield of water. be sure your answer has the correct number of significant digits in it.

How much energy is made when a pice of wood burns. how do you know

Why is the melting of ice a physical change ?