Base your answers to questions 22, 23, and 24 on the information below and on your knowledge of chemistry. The diagrams represent four different atomic nuclei. 22. Identify the element that has atomic nuclei represented by nucleus 1.

23. Determine the mass number of the nuclide represented by nucleus 2.

24. Explain why nucleus 2 and nucleus 4 represent the nuclei of two different isotopes of the same element.

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.

As light moves from one material into the next, which of the following affects how much the light waves will refract, or bend? angle at which the ray strikes the medium color of the material density of the material temperature of the light wave

Occluded fronts happen when warm air mass can get caught between two cold air fronts which can force the warm air up into a wedge shape true or false