BBC8 个月
Analysing and identifying substances - AQA
A paper chromatogram can also be used to identify substances by comparing them with known substances. Two substances are likely to be the same if: they produce the same number of spots ...
BBC1 年
How are chemicals separated and tested for purity? - OCR 21st Century
A paper chromatogram can also be used to identify substances by comparing them with known substances. Two substances are likely to be the same if: they produce the same number of spots ...