Why would you want to chew a xanax. They are nasty tasting. Unless less you are just looking for a fast high. That would be like chewing an oxycontin. They are time released and you could overdose.
By chewing them, you will destroy the "extended release" action of the pill.
Call your pharmacist and ask their opinion. Post the question to Dr. Gould on the experts forum. Ask Ryan here for his opinion.
Good luck...