THIS IS QUESTION AND ANSWER Jessa is a medical research assistant. She is examining antibodies under a microscope. She has to categorize each type of antibody based on their functions. Which type of antibody is responsible for each of the following functions?

IgA-prevents bacteria and viruses from entering the body
IgD-is responsible for identifying antigens and producing antibodies to fight the foreign substance
IgM-is the front line of defense when fighting bacteria or viral antigens
IgE-releases histamine during an allergic reaction
These are the answers took test on edmen.

How do you find a theoretical mass? is there a difference between theoretical mass and theoretical yield?

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?

These questions are based on the attached photo. the experiment is about burning magnesium metal with oxygen. 1. write the balanced chemical equation for the reaction you are performing. 2. calculate the mass of magnesium metal used in each trial. o trial 1: o trial 2: 3. calculate the actual yield of magnesium oxide for each trial. o trial 1: o trial 2: 4. magnesium is the limiting reactant in this experiment. calculate the theoretical yield of mgo for each trial. o trial 1: o trial 2: 5. determine the percent yield of mgo for your experiment for each trial. o trial 1: o trial 2: 6. determine the average percent yield of mgo for the two trials. your company currently uses a process with a similar cost of materials that has an average percent yield of 91 percent. if the average percent yield of this process is higher than that, this could save the company money. what is your recommendation to the company? support your recommendation using your data, calculations, and understanding of stoichiometry gathered from this lab.