There was a small error in the advance notice article for component H433/02 Scientific literacy in chemistry, which was published on the OCR website and Teach Cambridge on 13 March.

In the second main paragraph on page 2, we referred to ‘a proton’ incorrectly.

We stated:

• When a hydroxyl radical reacts with a protein, lipid (fat) or DNA, it snatches an electron to itself and sinks back into the sublime chemical stability of water and a proton.

We have corrected this, so the sentence now reads:

• When a hydroxyl radical reacts with a protein, lipid (fat) or DNA, it snatches a proton and an electron to itself and sinks back into the sublime chemical stability of water.

You can view and download the corrected advance notice article from the A Level Chemistry B qualification page on our website and on Teach Cambridge.

We've also corrected the hard copy version of the article, which is to be used with the question paper on the day of the examination, Tuesday 18 June 2024 – Morning.

Please make sure you share the latest version of the advance notice article with your students.

We're very sorry for this error and the additional work it causes you.

If you have any queries about this update, please call our Customer Support Centre on 01223 553998 or email support@ocr.org.uk.

Qualification

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