Questions: Chemical analysis
Pick a question type. Each time you get new numbers. Free ones are marked free.
Pure substances and formulations
- Which sample is pure: melting pointsChoose, 2 marks, free
- Pure in chemistry and pure on a labelChoose, 1 mark, free
- What impurities do to melting and boiling pointsChoose, 1 mark, free
- What a formulation isChoose, 1 mark, free
- Percentage of a component in a formulationCalculate, 2 marks, free
- Mass of a component from a percentageCalculate, 3 marks, free
- Scaling up a formulationCalculate, 4 marks, free
- Which water sample is pure: boiling pointsChoose, 2 marks, Plus
Required practical: chromatography
- Rf value when the start line is not at the edgeCalculate, 3 marks, free
- Distance from an Rf valueCalculate, 2 marks, free
- Mobile and stationary phasesChoose, 1 mark, free
- Reasons for the steps in chromatographyExplain, 1 mark, free
- Which substances are in the mixtureChoose, 2 marks, free
- Repeat runs: anomaly, mean and RfCalculate, 6 marks, free
- Locating agents for colourless substancesChoose, 1 mark, Plus
- Variables in the chromatography practicalChoose, 1 mark, Plus
- Plan a chromatography investigation (6 marks)Describe, 6 marks, Plus
Tests for gases
- Test and result for a gasChoose, 2 marks, Plus
- Name the gas from a test resultChoose, 1 mark, Plus
- Predict the gas test result for a reactionChoose, 1 mark, Plus
- The chemistry behind the gas testsExplain, 1 mark, Plus
- The test for chlorineChoose, 1 mark, Plus
- Identify gases from a results tableChoose, 3 marks, Plus
- Describe a gas testDescribe, 2 marks, Plus
Required practical: identifying ions
- Flame test coloursChoose, 1 mark, Plus, Chemistry only
- Metal ion from a flame colourChoose, 1 mark, Plus, Chemistry only
- Doing a flame test wellExplain, 1 mark, Plus, Chemistry only
- Metal hydroxide precipitatesChoose, 1 mark, Plus, Chemistry only
- Metal ion from a hydroxide precipitateChoose, 1 mark, Plus, Chemistry only
- Telling the white precipitates apartChoose, 1 mark, Plus, Chemistry only
- The silver nitrate test for halidesChoose, 2 marks, Plus, Chemistry only
- Negative ion from a test resultChoose, 1 mark, Plus, Chemistry only
- Why the acid comes first in the anion testsExplain, 1 mark, Plus, Chemistry only
- Name a compound from two test resultsDetermine, 3 marks, Plus, Chemistry only
- Three unknown solutions: results tableDetermine, 2 marks, Plus, Chemistry only
- Ionic equation for a precipitateChoose, 1 mark, Plus, Chemistry only, Higher tier
- Plan to identify the ions in an unknown salt (6 marks)Describe, 6 marks, Plus, Chemistry only
Instrumental methods
- Metals in a mixture from line spectraChoose, 2 marks, Plus, Chemistry only
- Which metal is not in the sampleChoose, 1 mark, Plus, Chemistry only
- Advantages of instrumental methodsChoose, 2 marks, Plus, Chemistry only
- How flame emission spectroscopy worksExplain, 1 mark, Plus, Chemistry only
- Concentration from a calibration lineDetermine, 2 marks, Plus, Chemistry only
- Calibration line with a diluted sampleCalculate, 4 marks, Plus, Chemistry only
- Plot a calibration line and use itPlot, 3 marks, Plus, Chemistry only
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