Is the formation of a hydrate a physical or chemical process

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.

With carbon dioxide what phase change take place when the temperature decreases from -40c to -80c at 2 atm

Which of the following questions can use science as a method of inquiry? is cloning appropriate? how can we protect crops from drought? why is jazz a great type of music? did dinosaurs exist?