The elements in Group 7 of the Periodic Table are known as the halogens.
Write a balanced chemical equation to show the formation of the salt sodium bromide from a metal and a halogen.
Hydrogen bromide, HBr\text{HBr}HBr, can behave differently depending on the solvent.
When hydrogen bromide is dissolved in the non-polar solvent hexane, and a piece of magnesium ribbon is added, no reaction is observed. However, when water is added to this mixture and it is shaken, a reaction occurs.
Explain this observation, identifying the gas produced and why the reaction only proceeds after adding water.
Hydrogen bromide and hydrobromic acid can both be represented by the formula HBr\text{HBr}HBr. State the physical state symbol at room temperature for each:
Chlorine gas can displace bromine from an aqueous solution of sodium bromide. The ionic half-equations for this reaction are:
Cl2+2e−→2Cl− \text{Cl}_2 + 2\text{e}^- \rightarrow 2\text{Cl}^- Cl2+2e−→2Cl− 2Br−→Br2+2e− 2\text{Br}^- \rightarrow \text{Br}_2 + 2\text{e}^- 2Br−→Br2+2e−Write the overall balanced ionic equation for this displacement reaction.
Explain, with reference to the appropriate species and to electrons, why this reaction is described as a redox reaction.
