State and explain how the volatility of chlorine, bromine and iodine changes down the group.
State the conditions needed for chlorine to react with hydrogen at room temperature.
When heated, iodine reacts with hydrogen reversibly. Give the equation for this reaction. Include state symbols.
In this reaction, one of the reactants acts as a Brønsted-Lowry acid. What is meant by the term Brønsted-Lowry acid?
Identify the reactant that is acting as an acid and its conjugate base. acid ............................. conjugate base .............................
Name the type of bond formed between $\text{H}^+$ and $\text{H}_2\text{O}$ to produce $\text{H}_3\text{O}^+$.
For $\text{H}_3\text{O}^+$, predict its shape and the H-O-H bond angle. shape ............................. bond angle .............................