The life of a chemist is often filled with challenges. One of the largest challenges any chemist can face is the purification of a mixture.
Generally, if you know the answer to a question, it can be relatively easy to write an explanation either by writing a few sentences, drawing a diagram or by producing an example.
Few months before the examination, secondary students sitting for the GCSE or its international version IGCSE will begin cramming in a desperate attempt to score higher.
The video explains the recent changes to GCSE examinations. This video was published by Ofqual. Ofqual is the Office of Qualifications and Examinations Regulation is a non-ministerial government department that regulates qualifications, exams and tests in England.