Two states of matter are described below. state x: particles are ions that are far apart state y: particles are molecules that are far apart which combination of the state and a substance in that state is correct? state x = lightning; state y = air state x = oxygen; state y = neon state x = oxygen; state y = water state x = air; state y = milk ben wrote the following examples of changes in substances. example a: vegetables are chopped. example b: food is broken up into simpler form during digestion. which statement is correct? both are examples of physical changes. both are examples of chemical changes. example a describes a physical change and example b describes a chemical change. example a describes a chemical change and example b describes a physical change.

H2so4(aq) + mg(s)—> mgso4(aq) +h2(g) which substance is the acid in the reaction?

Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.

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.