AS and A Level Chemistry B

Following feedback we have received about some online resources and textbooks containing incorrect equations for calculating the depletion of ozone by chlorine radicals (OZ(q)), we’ve updated our Chemistry B specifications for AS (H033) and A Level (H433) to provide additional guidance. 

This update reflects the guidance already provided in our Chemistry A specifications for AS (H032) and A Level (H432) and we have included examples of the equations expected for this process.

We have published the latest version of the specifications on the Chemistry B AS (H033) and A Level (H433) qualification pages.

If you have any questions, please contact the science subject team on 01223 553998 or at science@ocr.org.uk.

Qualifications

• Chemistry A - H032, H432 (from 2015)
• Chemistry B (Salters) - H033, H433 (from 2015)