4.2 Group 7

Question 1

What are the properties of group 7 elements?

Answer 1

diatomic
darker in colour down group
mp / bp increases down group

Question 2

What are the group 7 elements?

Answer 2

F2
Cl2
Br2
I2
At2

Question 3

What is the formula for Fluorine?

Answer 3

Fl2

Question 4

What is the formula for Chlorine?

Answer 4

Cl2

Question 5

What is the formula for Bromine?

Answer 5

Br2

Question 6

What is the formula for Iodine?

Answer 6

I2

Question 7

What is the formula for Astatine?

Answer 7

At2

Question 8

What is the colour of Fluorine?

Answer 8

pale yellow

Question 9

What is the colour of Bromine?

Answer 9

brown

Question 10

What is the colour of Chlorine?

Answer 10

pale green

Question 11

What is the colour of Iodine?

Answer 11

dark grey

Question 12

What is the colour of Astatine?

Answer 12

black

Question 13

What state is Fluorine?

Answer 13

gas

Question 14

What state is Chlorine?

Answer 14

gas

Question 15

What state is Bromine?

Answer 15

liquid

Question 16

What state is Iodine?

Answer 16

solid

Question 17

What state is Astatine?

Answer 17

solid

Question 18

What happens when group 7 elements react with metals?

Answer 18

ionic compound forms
outer shell electrons from metal transferred to halogen

Question 19

How many electrons do group 7 elements have in the outside shell?

Answer 19

7

Question 20

What happens when the group 7 atom forms an ion?

Answer 20

halogen -> halIDE

Question 21

Why is group 7 + metal a redox reaction?

Answer 21

metal loses electrons
group 7 gains electrons

Question 22

Why do halogens get less reactive down the group?

Answer 22

need full electron shell
atoms further down have more shells
further from nucleus
attraction to nucleus is weaker

Question 23

What is the chemical test for chlorine?

Answer 23

damp blue litmus paper turns white

Question 24

When does halogen displacement occur?

Answer 24

more reactive halogens displace less reactive halogens

Question 25

What colour is aqueous Chlorine?

Answer 25

colourless

Question 26

What colour is aqueous Bromine?

Answer 26

yellow

Question 27

What colour is aqueous Iodine?

Answer 27

brown

Question 28

What colour is potassium chloride?

Answer 28

colourless

Question 29

What colour is potassium bromide?

Answer 29

colourless

Question 30

What colour is potassium iodide?

Answer 30

colourless

Question 31

What is the reactivity trend in group 7?

Answer 31

clinton
brought
itchiness

Question 32

What is the order of group 7?

Answer 32

for
class
bro
i
ate

Question 33

What happens when colour change occurs in halogen displacements?

Answer 33

more reactive halogen must be present

Question 34

What happens when no colour change occurs in halogen displacement?

Answer 34

less reactive halogen must be present

Question 35

Colour change only occurs if….

Answer 35

more reactive halogen has displaced less reactive halogen

Question 36

A halogen can not displace…

Answer 36

itself or a more reactive halogen

Question 37

remember! the colour of the solution left behind is the colour of the…

Answer 37

displaced halogen NOT the more reactive halogen

Question 38

Why is the colour of the solution left behind the colour of the displaced halogen?

Answer 38

when displaced, the halogen becomes diatomic again rather and the more reactive halogen becomes a halIDE

Question 39

All halogen displacement reactions are…

Answer 39

redox reactions

Question 40

Why are all halogen displacement reactions redox reactions?

Answer 40

more reactive halogen steals an electron

Question 41

What does Bromine release?

Answer 41

releases brown fumes

Question 42

What does Iodine release?

Answer 42

releases purple fumes

Question 43

What does Bromine do?

Answer 43

volatiles

Question 44

What does Iodine do?

Answer 44

sublimes