Identifying Substances 0.0 / 5 ? ChemistryTesting and analysing substancesGCSEEdexcel Created by: katiebrosterCreated on: 02-05-16 17:10 are common salts of sodium soluble? yes 1 of 27 are common salts of potassium soluble? yes 2 of 27 are common salts of ammonium soluble? yes 3 of 27 are nitrates soluble? yes 4 of 27 are common chlorides soluble? yes, except silver and lead chloride 5 of 27 are common sulfates soluble? yes, except lead, barium and calcium sulfate 6 of 27 are common carbonates soluble? no, except sodium, potassium and ammonium carbonate 7 of 27 are common hydroxides soluble? no, except for sodium, potassium and ammonium hydroxide 8 of 27 what colour flame do sodium ions produce? yellow 9 of 27 what produces a lilac flame potassium ions 10 of 27 what produces a brick-red flame? calcium ions 11 of 27 what colour flame do copper ions produce? blue-green 12 of 27 what is a precipitation reaction? when two soluble substances react to produce an insoluble substance 13 of 27 is barium sulfate insoluble or soluble? insoluble 14 of 27 why does barium sulfate show up to x-rays? it is opaque to them 15 of 27 why can barium sulfate be safely drunk even though barium salts are toxic? barium sulfate is insoluble so isn't absorbed into the bloodstream 16 of 27 what is it known as when a patient drinks barium sulfate before and x-ray? a barium meal 17 of 27 what do you check for when testing for carbonates? carbon dioxide (CO2) 18 of 27 what is the test to test for carbonates? Add acid. Bubble gas produced into limewater. If carbonate, limewater will turn milky as CO2 is given off. 19 of 27 what do you look to see formed when testing for sulfates and chlorides? precipitates 20 of 27 what is the chemical formula for sulfate ions? SO42- 21 of 27 how do you test for sulfate ions? Add dilute HCl, then add barium chloride solution (BaCl2). If sulfate ion - white precipitate of barium sulfate (BaSO4) 22 of 27 how do you test for chloride ions? Add dilute nitric (HNO3), then silver nitrate solution (AgNO3) = white precipitate of silver chloride (AgCl) 23 of 27 what is the chemical formula for a chloride ion? Cl- 24 of 27 why is spectroscopy good? it is fast and reliable 25 of 27 how does spectroscopy work? each element produces a different pattern of light 26 of 27 give 2 elements that were discovered by spectroscopy? rubidium and caesuim 27 of 27
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