‹ GCSE Combined and Separate Science
Chemical analysis
Purity and formulations, chromatography and Rf values, tests for gases, and for separate Chemistry the tests for ions and flame emission spectroscopy.
Start: Pure substances and formulations About 20 min, free
Lessons
Practise and test
By the end you can
Use melting and boiling point data to tell pure substances from impure ones Calculate percentages and masses of the components in a formulation Carry out chromatography, calculate Rf values and read a chromatogram Describe the tests for hydrogen, oxygen, carbon dioxide and chlorine Identify metal ions and negative ions from test results (Chemistry only) Read line spectra and calibration lines from flame emission spectroscopy (Chemistry only) Revision notes
Specifications AQA 8462 (Chemistry) 4.8AQA 8464 (Combined Trilogy) 5.8Pearson Edexcel 1CH0 and 1SC0 Topics 2 and 9OCR Gateway J248 and J250 C2.1 and C4.2
Next unit: The Earth's atmosphere Previous unit: Organic chemistry
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