C1; Air Quality ; Keywords Some keywords for the GCSE C1 OCR Chemistry course. Clues marked with an asterisk (*) are Higher Tier. 0.0 / 5 ? ChemistryThe pollutants of combustionThe earth and its atmosphereGCSEOCR Created by: ewelynCreated on: 29-11-15 18:44 862435179 Across 1. *A method of removing acidic compounds (e.g. sulphur dioxide) from emission gases (3, 9) 4. A compound made of only carbon and hydrogen atoms (11) 7. Addition of oxygen / removal of electrons (9) 8. This occurs when there isn't enough oxygen to burn with a fuel (10, 10) 9. The gases that absorb radiation & prevent it from leaving the atmosphere (10, 5) Down 2. The thin layer of gases surrounding the Earth (10) 3. The chemical reaction of a fuel burning in oxygen that releases heat (10) 5. The product of sulphur dioxide or nitrogen dioxide and water (4, 4) 6. This device can be fitted into a car exhaust to reduce air pollutant emissions (9, 9)
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