What volume of concentrated 18M solution is required to prepare 550 mL of a 2.0M solution?

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.

Sorry i dont understand the question can you rephase it?

Bthats what im doing to and i figured it out it is b