How does a jacket act as insulator?
The material of the jacket prevents heat from being lost.
The jacket can create friction to keep your body warm.
The jacket can deflect off cold air.
It helps transfer heat from the outside of the jacket to the inside.

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.