What the heck are you talking about? Most of the best universities in the world are in the states so let's start there. Most CS programs don't require any chemistry at all, and you would be crazy to take chemistry and compete with all the really grade-savvy pre-meds anyways. Now, that leaves math and physics, which are reasonable gates for CS and many other kinds of engineering.
CS is not a natural science, and even physics has a very tenuous relationship with it. It is more like a math or an engineering discipline, with a bit of design thrown in.
Disclaimer: I studied CS for around 10 years, getting a PhD out of it and doing "real" science.
My point was that you cannot expect to get into top CS programs by being a good programmer, but yeah, I didn't really specify that chemistry is not important.
CS is definitely not a natural science, which why I didn't even remotely suggest it.
CS is not a natural science, and even physics has a very tenuous relationship with it. It is more like a math or an engineering discipline, with a bit of design thrown in.
Disclaimer: I studied CS for around 10 years, getting a PhD out of it and doing "real" science.