An environmental safety officer is investigating a chemical neutralisation reaction inside a sealed containment chamber to ensure that no hazardous chlorine gas escapes into the atmosphere.
They measure the total mass of the chamber and its contents before and after the reaction. The measurements are shown in Table 1.
Table 1
| Before reaction | After reaction | |
|---|---|---|
| Total mass of chamber and contents / kg | 142.75 | 142.75 |
State how the measurements in Table 1 confirm that no hazardous gas escaped from the chamber during the reaction.
230 exam-style questions on Edexcel GCSE Chemistry 1.1 Formulae, equations and hazards, covering 1.1.1 Formulae, word and balanced equations, 1.1.2 Balanced ionic equations, and 1.1.3 Hazard symbols and risk in practical work. Each one has a worked solution and a mark scheme showing where the marks go.