A light emitting diode (LED) glows when an electric current moves in one direction but not the other. What type of material is LED A).conductor
B).insulator
C).semiconductor
D).capacitor

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.

0.2348 grams of pbcl2 used to form 44.0 ml of solution.

Calculate the number of moles of ethane in 100 grams