In subatomic particles what changes and what remains the same in isotopes

Compare and contrast physical changes with chemical changes.

Select all of the methods through which a drug can enter your body. injection swallowing inhalation absorption

Draw any one of the skeletal structures of a 2° alkyl bromide having the molecular formula of c6h13br and two stereogenic centers. indicate chirality by using wedge and hashed wedge notation. lone pairs do not need to be shown.