explain the following observations. when chlorine is bubbled through aqueous potassium iodide, the solution turns yellow​

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

Calculate the number of molecules present in 0.750 mol of mgo.