When a mg atom and o atom come together to form a bond to make mgo, is energy absorbed or released? how can you prove that energy was absorbed or released to form that bond?

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.

What effect does a decrease in temperature have on the overall rate of a chemical reaction? a decrease in temperature decreases . the reaction rate will

Stage in which a star’s outer layers have started to cool and grow outward?