Understanding the intellectual demands of an intended curriculum is crucial as it defines the frames for teaching and learning processes and practice during lessons. In this study, upper-secondary school chemistry curricula contents in Czechia, Finland, and Turkey were analysed, and their objectives were compared using the Revised Bloom's Taxonomy (RBT). The intellectual demands were examined analysing the action verbs in the three curricula objectives based on their association with the intended cognitive process dimensions in the RBT. The Turkish upper-secondary chemistry curriculum was found to be more structured, detailed, and containing more objectives than the Czech and Finnish curricula. The domineering objectives in cognitive demands were understand (77.2%) and analyse and apply (both 7.1%). Conceptual items dominated (59.8%) with procedural items identified (29.1%). Also, there are five metacognitive items (3.9%). The Czech curriculum, compared to the Finnish and Turkish curricula, does not take modern trends in the field of chemistry into account. The cognitive demands in the Czech curriculum were skewed toward apply (40%) with understand and evaluate accordingly represented by 20%. Conceptual items dominate with a 53.3% of occurrence. In the Finnish curriculum, the cognitive demands were skewed toward apply (47.1%) with create (23.5%) and understand (17.6%). Procedural (35.3%) domains predominate, although metacognitive objectives represent a significant share (23.5%) too. These findings from the contents and intellectual demands of the curricula in each of the three countries have the potential to help teachers and other actors in education design the interventions and assessments implemented in the classes. Comparing the distribution of intellectual demands between the countries provides an international reference for educational reforms in hand in many countries.