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    PracticeAQA GCSEAQA GCSE Chemistry Foundation Tier Paper 1Question 02.5
    Easy1 markMultiple Choice
    Chemical changesTitrationData AnalysisAnomalous Results

    AQA GCSE · Question 02.5 · Chemical changes

    Which is the anomalous result in Table 1?
    <br/><br/>

    <table border="1" cellpadding="12" cellspacing="0" style="border-collapse: collapse; font-family: Arial, sans-serif; font-size: 15px; border: 2px solid black;"> <caption style="font-weight: bold; font-size: 16px; margin-bottom: 10px;">Table 1</caption> <tr> <th style="border: 1px solid black; padding: 12px; text-align: left; font-weight: bold;">Trial</th> <th style="border: 1px solid black; padding: 12px; text-align: center; font-weight: bold;">1</th> <th style="border: 1px solid black; padding: 12px; text-align: center; font-weight: bold;">2</th> <th style="border: 1px solid black; padding: 12px; text-align: center; font-weight: bold;">3</th> <th style="border: 1px solid black; padding: 12px; text-align: center; font-weight: bold;">4</th> </tr> <tr> <td style="border: 1px solid black; padding: 12px; font-weight: bold;">Volume of hydrochloric acid<br/>added in cm<sup>3</sup></td> <td style="border: 1px solid black; padding: 12px; text-align: center;">24.3</td> <td style="border: 1px solid black; padding: 12px; text-align: center;">24.5</td> <td style="border: 1px solid black; padding: 12px; text-align: center;">28.1</td> <td style="border: 1px solid black; padding: 12px; text-align: center;">24.4</td> </tr> </table> <br/><br/>

    Answer options:

    A.

    Trial 1

    B.

    Trial 2

    C.

    Trial 3

    D.

    Trial 4

    How to approach this question

    An anomalous result is one that does not fit the pattern of the other results. Look at the four volumes recorded: 24.3, 24.5, 28.1, 24.4. Identify the value that is significantly different from the others.

    Full Answer

    C.Trial 3✓ Correct
    Trial 3
    The results for the volume of hydrochloric acid are 24.3 cm³, 24.5 cm³, 28.1 cm³, and 24.4 cm³. The results from Trials 1, 2, and 4 are all very close to each other (concordant). The result from Trial 3 (28.1 cm³) is much higher and does not fit the pattern. Therefore, it is the anomalous result.

    Common mistakes

    ✗ Choosing a result that is close to the others.\n✗ Calculating the mean and choosing the one furthest from it without considering the cluster.
    Question 02.4All questionsQuestion 02.6

    Practice the full AQA GCSE Chemistry Foundation Tier Paper 1

    58 questions · hints · full answers · grading

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