In the US there are far fewer masters programs for chemistry than PhD programs. It is usually fairly rare to find a masters program for hard sciences (as opposed to engineering where it is far more common). My impression of a masters in chemistry is that it does not have much utility and is not particularly useful career-wise, but others may feel differently about that.
In any case, as far as ease of acceptance I can only comment on engineering masters, which are much less selective than PhD programs. Most schools look at masters students as easy money and are happy to accept many international students.