If you will already have completed AP chemistry, there is not much reason to take IB chemistry, since even HL is unlikely to give more advanced placement in college than AP chemistry (though you can check various colleges’ AP and IB credit listings to see). At worst, it may look to college admission readers like you are repeating the same chemistry material (grade grubbing).
For any science major in college, it is best to have physics in high school (does not have to be AP or IB level) at least as a preview of topics you will seen in required college physics courses.