Use the range of a set of measurements about the mean as a measure of uncertainty.

In the subtopic Chemical measurements, this learning objective focuses on use the range of a set of measurements about the mean as a measure of uncertainty. It sits within Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations for AQA GCSE Chemistry 8462 Unit 4.3, so the explanation must stay anchored to quantitative chemistry rather than drifting into a general chemistry idea. Approved keywords to use include uncertainty, range, mean. Range. means the difference between the highest and lowest values in a set of measurements, used to assess measurement uncertainty Avoid the mistake of students often calculate the range by subtracting the smallest measurement from the largest without considering the mean; instead, to correctly use the range as a measure of uncertainty, calculate the mean of the measurements first, then determine the range by finding the difference between the highest and lowest values For exam answers, always calculate the range of your measurements to assess uncertainty. This helps you understand the reliability of your results