1) Why do we add salt to the ice?
Ans: Salt decrease the temperature which helps it cools easier.
2) Why do we add the cookies and other things, only after the milk has frozen slightly?
Ans: It will make the frozen milk tastier.
3) What are two factors that affect the freezing you think?
Ans: Ice and milk
4) Why do you need a bit of air in the bag?
Ans: In my opinion, the air inside will be the space when milk vibrates and air can change the temperature inside