Group 7

Question 1

Explain the trend in boiling point of the halogens as you go down the group.

Answer 1

Boiling Point increases
• there more electrons
• More london forces
• More energy to required to break intermolecular forces

Question 2

Explain the Trend in reactivity aa you go down the group.

Answer 2

Reactivity Decreases
• Increased atomic readius 
• Increased sheilding 
• Less realtive nucleur attraction
• Harder to gain electron
• Lower reactivity down the group

Question 3

What is chlorine used for?

Answer 3

To clean drinking water

Question 4

Give 1 adavtage and 1 disadvantage if usinv chlorine in water treatment.

Answer 4

Advantage - Chlorine kills harmful bacteria

Disadvantage - chlorinated hyrdocarbons can cause cancer

Question 5

What reacts with chlorine to make bleach?

Answer 5

cold, dilute aqueous sodium hydroxide