Two students each measured the same volume five times. Student 1 obtained a mean of 20.0 cm3 with a range of 0.4 cm3. Student 2 obtained a mean of 20.0 cm3 with a range of 1.2 cm3. Which statement is correct?
Student 1 has the smaller uncertainty, which is ±0.2 cm3\pm 0.2\ \text{cm}^3±0.2 cm3.
Student 1 has the smaller uncertainty, which is ±0.4 cm3\pm 0.4\ \text{cm}^3±0.4 cm3.
Student 2 has the smaller uncertainty, which is ±0.6 cm3\pm 0.6\ \text{cm}^3±0.6 cm3.
Student 2 has the smaller uncertainty, which is ±1.2 cm3\pm 1.2\ \text{cm}^3±1.2 cm3.
40 exam-style questions on AQA GCSE Chemistry 3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations, covering 3.1.1 Conservation of mass and balanced chemical equations, 3.1.2 Relative formula mass, 3.1.3 Mass changes when a reactant or product is a gas, and 3.1.4 Chemical measurements. Each one has a worked solution and a mark scheme showing where the marks go.