This question is about Group 2 and Group 17.
Barium nitrate can be prepared from barium hydroxide in a neutralisation reaction.
Write the equation for this reaction. State symbols are not required.
The first ionisation energy of the Group 17 elements F−I\text{F}-\text{I}F−I decreases down the group.
Explain why.
On heating, the compound KClO3\text{KClO}_3KClO3 reacts as shown in the equation:
4KClO3(s)→3KClO4(s)+KCl(s) 4\text{KClO}_3(\text{s}) \rightarrow 3\text{KClO}_4(\text{s}) + \text{KCl}(\text{s}) 4KClO3(s)→3KClO4(s)+KCl(s)This reaction is an example of disproportionation.
State what is meant by disproportionation and use oxidation numbers to show that disproportionation has taken place in this reaction.
What is the systematic name for KClO4\text{KClO}_4KClO4?
Two changes are described below.
For each change,
The reaction of aqueous barium chloride with aqueous sodium sulfate.
The change that accompanies the standard enthalpy change of atomisation of iodine.
