Hydrogen burns in chlorine gas to form hydrogen chloride. Hydrogen also reacts with bromine vapour, when heated, to form hydrogen bromide.
Write the balanced equation, with state symbols, for the reaction of hydrogen with chlorine.
Hydrogen chloride dissolves in water to form hydrochloric acid, which is a strong acid. Explain, in terms of ions, what is meant by a strong acid.
The equation for the reaction of hydrogen with bromine is: H2(g)+Br2(g)→2HBr(g)\mathrm{H_{2}(g)} + \mathrm{Br_{2}(g)} \rightarrow \mathrm{2HBr(g)}H2(g)+Br2(g)→2HBr(g) Calculate the maximum mass of hydrogen bromide that can be made from 0.40 g of hydrogen. Relative atomic masses: H = 1, Br = 80
A solution of hydrogen bromide in water has a pH of 1. The solution is diluted so that the hydrogen ion concentration decreases by a factor of 10. State the new pH of the solution.
41 exam-style questions on Edexcel GCSE Chemistry 7.2 Group 7, covering 7.2.1 Physical properties of the halogens, 7.2.2 Reactions of the halogens, 7.2.3 Relative reactivity and displacement reactions of the halogens, and 7.2.4 Halogen displacement as a redox reaction. Each one has a worked solution and a mark scheme showing where the marks go.