Two open crucibles are weighed before and after separate experiments. Calcium carbonate is heated strongly in crucible P. Magnesium is burned in air in crucible Q. The crucibles are cooled before the final balance readings are recorded.
Which statement describes the changes in the balance readings?
The reading for P rises and the reading for Q also rises.
The reading for P stays the same and the reading for Q rises.
The reading for P falls and the reading for Q rises.
The reading for P rises and the reading for Q falls.
95 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.