Halogens

Question 1

What group are Halogens?

Answer 1

7

Question 2

What charge do Halogen ions have?

Answer 2

-1

Question 3

Are halogens more reactive if you go up or down the group?

Answer 3

More reactive as you go up the group

Question 4

Trends in melting and boiling point.

Answer 4

Melting point and boiling point decrease as you go up the group.

Question 5

What can chlorine be used for?

Answer 5

To kill bacteria - used in water treatment (Chlorination)

Question 6

Halogen hazards

Answer 6

Toxic, corrosive

Question 7

Which two halogens are gases?

Answer 7

Fluorine (pale yellow gas) and chlorine (pale green gas)

Question 8

Halogens react with alkali metals to form?

Answer 8

Salts e.g. sodium chloride

Question 9

What state is iodine in under standard conditions?

Answer 9

Grey solid crystals

Question 10

What state is bromine in under standard conditions?

Answer 10

Brown liquid

Question 11

What colour is the vapour of iodine?

Answer 11

Purple

Question 12

Halogens can be placed in order of reactivity what does this tell you about how they will react with each other.

Answer 12

A more reactive halogen will displace a less reactive halogen

Question 13

What do we mean by the term diatomic?

Answer 13

Diatomic molecules are molecules composed of only two atoms, of the same or different chemical elements

Some elements are found as diatomic molecules

e.g. H₂, N₂, O₂

Note All Halogens are diatomic - Cl₂, I₂, F₂, Br₂

Question 14

How would you reduce the risk from hazards such as corrosive?

Answer 14

• Wear a lab coat, gloves and goggles
• Do not drink/eat in the laboratory
• Place chemicals away from the edge
• Always put the top back on the container