Describe the colours of the Group 17 elements from chlorine to iodine at room temperature.
Describe how the reactivity of chlorine to iodine changes as oxidising agents.
State the observation when chlorine reacts with hydrogen.
Explain why the thermal stability of the hydrogen halides falls down the group.
The halogenoalkane $\text{CH}_3\text{CH}_2\text{Cl}$ is formed when chlorine reacts with $\text{C}_2\text{H}_6$ by a free-radical substitution mechanism. Define free radical.
State the essential condition for chlorine to react with $\text{C}_2\text{H}_6$ at room temperature.
Write two equations that show the propagation steps in this reaction.
Another halogenoalkane is $\text{CHCl}_3$. $\text{CHCl}_3$ is formed when propanone reacts with $\text{NaClO}$. $\text{NaClO}$ is prepared from chlorine in a disproportionation reaction. Identify a reagent and conditions that can be used to convert chlorine to $\text{NaClO}$.
Define disproportionation.
Write numbers in the boxes so that the equation for the reaction of propanone with $\text{NaClO}$ is balanced. $\text{CH}_3\text{COCH}_3 + \boxed{}\,\text{NaClO} \rightarrow \boxed{}\,\text{CHCl}_3 + \boxed{}\,\text{CH}_3\text{COONa} + \boxed{}\,\text{NaOH}$
Aqueous $\text{AgNO}_3$, dissolved in ethanol, is added to an aqueous solution of $\text{CHCl}_3$. State the observation in this reaction. Explain your answer.
Write numbers in the boxes to balance the equation for the reaction of propanone with $\text{NaClO}$. $\text{CH}_3\text{COCH}_3 + \square\,\text{NaClO} \rightarrow \square\,\text{CHCl}_3 + \square\,\text{CH}_3\text{COONa} + \square\,\text{NaOH}$
Aqueous $\text{AgNO}_3$, dissolved in ethanol, is added to an aqueous solution of $\text{CHCl}_3$. State the observation in this reaction. Explain your answer.