Chemistry Unit Three - Chemical Analysis This cross word allows you to revise the results of forming precipitates, flame tests and testing for negative ions in a fun way. 0.0 / 5HideShow resource informationChemistryAnalysing substancesTesting and analysing substancesGCSEAQACreated by: Rachael_StevensCreated on: 07-02-15 10:59 9836174510 Across 1. What colour does a flame go if barium is added during a flame test? (5) 4. You use a flame test to determine which precipitate is magnesium and which is calcium. What colour would the flame turn if it was calcium? (3) 5. Which positive ion's precipitate is soluble in excess sodium hydroxide? (9) 6. When testing for sulphate ions (negative ions) what type of acid must be used? (12) 10. If carbonate ions (negative ions) are present what colour precipitate is formed? (5) Down 1. What colour precipitate does iron (II) form what sodium hydroxide is added? (5) 3. Which positive ion forms a blue precipitate when sodium hydroxide is added? (6) 7. When testing for halide ions (negative ions) if silver iodide is present what colour precipitate will form? (6) 8. When testing for carbonates (negative ions) what dilute solution do you add? (4) 9. Which gas is produced which tells you if a carbonate ion (a negative ion) is present in a compound? (6, 7)
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