PLEASE ANSWER QUICK 20 PTS AND ILL MARK YOU BRAINLIEST What is Sodium (Na) level of reactivity?

Low Reactivity

Medium Reactivity

High Reactivity

Not Reactive- Stable

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.

Matches the chemical name of each oxide of phosphorus to its chemical formula

In a heat of an engine, if 700 j enters the system, and the piston does 400 j of work what is the final internal (thermal) energy of the system if the initial energy is 1,500 j