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Pure Substances (GCSE Chemistry)
The following is a GCSE Chemistry test covering 'Pure Substances' from the broader topic Chemical Analysis. The test is geared towards the AQA exam board style syllabus.Incorrect: 0
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Question 1
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Which result shows that a solid sample contains carbonate ions when treated with dilute acid?
Why does the Rf value of a dye not change when the solvent front is allowed to travel farther up the paper?
Which of the following best describes a pure chemical substance?
How can the pale lilac flame of potassium be more easily seen when sodium contamination produces a strong yellow flame?
Which method is the most appropriate simple laboratory technique to separate and identify two coloured dyes in an ink sample?
Which test and observation distinguish bromide ions from iodide ions when treated with acidified silver nitrate?
Which instrument separates ions by mass and can identify isotopes and relative atomic masses?
Which simple test and result identify hydrogen gas in a laboratory test?
Which sequence of quick tests will distinguish carbonate ions from sulfate ions?
Which property would you measure to check whether a crystalline solid sample is impure?
Which test result would distinguish a covalent molecular compound from an ionic compound?
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