A student records a mass from a balance as 4.27 g rather than as 4 g. Why is the reading recorded to 2 decimal places?
It reduces the uncertainty in the measurement.
It makes the reaction happen more quickly.
It removes the need to repeat the measurement.
It makes the balance more accurate than before.
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.