Two students each heated a different metal carbonate in an open test tube. Table shows their results.
Table: The mass of the solid before and after heating for two different metal carbonates
| Student | Mass of solid before heating in g | Mass of solid after heating in g |
|---|---|---|
| Alia | 8.40 | 4.00 |
| Ben | 10.00 | 5.60 |
Calculate the loss in mass of the solid in Alia's test tube.
Both students said that mass had been destroyed in the reaction. Explain why the students are wrong.
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.