This probably sounds really ignorant because the requirement is there on the website, but is it a solid requirement?
I know from your other posts that you are taking the IB - if you are taking chem and physics already then no I don’t think its a solid requirement. In your application remind them of the nature of the IB where you can only select two science courses and I think that should be fine. If you are only taking one science you may have to talk to them about your case specifically and see if they will make any exceptions.