This set of quiz cards was created as a repetition of chapter
Mixtures (Polish middle school chemistry), including homo- and
heterogeneous mixtures (and their separation), air and its
ingredients, water solutions (including calculations of solubility
and concentration). It may be played in several ways by two or
more teams of pupils. I recommend at least 60 s for an answer.
This is short version. Full version contains 24 cards and is going
to be available later.