Ineed with this
calculate the change in boiling point when 0.402 moles of sodium chloride are added to 0.200 kilograms of water. kf = -1.86°c/m; kb = 0.512°c/m

-2.1°c

2.1°c

-7.5°c

7.5°c

The last one 7.5

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.