The spur to this merger has come from revision of the Scottish Highers under the Higher Still initiative, which will bring academic and vocational courses together under the same title to provide a unified system of assessment and certification.
Dr Hamish Long, chief executive of the SEB, said the new qualification would help to bring about parity of esteem between the vocational and academic and create "better progression for young people in Scotland".
The presence of only one exam board and one awarding body made the whole process easier. He said: "It is easier not to have a choice of syllabuses, then comparability of standards does not arise.
"If there's a best course for chemistry, then choice should be restricted to that."