4.2 - Group 7

Question 1

Colour, State and formula of Fluorine

Answer 1

Very pale yellow, gas, F2

Question 2

Colour, State and formula of Chlorine

Answer 2

Pale green, gas, Cl2

Question 3

Colour, State and formula of Bromine

Answer 3

Brown, liquid, Br2

Question 4

Colour, State and formula of Iodine

Answer 4

Dark Grey, Solid, I2

Question 5

Colour, State and formula of Astatine

Answer 5

Black, solid, At2

Question 6

What do halogens form when they react with metals

Answer 6

Ionic compounds

Question 7

Define ionic bonding

Answer 7

The strong electrostatic attraction between a positive and negative ion

Question 8

Define covalent bonding

Answer 8

The strong electrostatic attraction between a pair of shared electrons and the positive nuclei

Question 9

What kind of reaction is a reaction between a metal and a halogen

Answer 9

Redox reaction
(Metal loses electrons)
(Halogen gains electrons)

Question 10

In a reaction with a metal what does the halogens name change to

Answer 10

Halogen -> Halide

Question 11

Fill the Gap
Halogens get …. Reactive down the group

Answer 11

Less

Question 12

Fill the Gap
Colours get …. Down the group

Answer 12

Darker

Question 13

Fill the Gap
Boiling/melting point …. Down the group

Answer 13

Increases

Question 14

Fill the Gap
All halogen atoms need to …. An electron to fill their ….

Answer 14

Gain, outer shell

Question 15

Why is it more difficult for a halogen to gain an electron as you go down the group

Answer 15

Atoms have more electron shells
The extra electron is further away from the nucleus
So its attraction to the nucleus is weaker

Question 16

Why is it easier for a metal to lose an electron as you go down the group

Answer 16

Atoms have more electron shells
The extra electron is further away from the nucleus
So its attraction to the nucleus is weaker and can be lost easier

Question 17

What does the group show on the periodic table

Answer 17

Number of electrons in outer shell
(The electrons GROUP together)

Question 18

What does the period show on the periodic table

Answer 18

The number of electron shells

Question 19

What does the period show on the periodic table

Answer 19

The number of electron shells

Question 20

Test for chlorine

Answer 20

Damp blue litmus paper in gas turns white
Because chlorine acts as a bleaching agent so it removes the colour from the paper

Question 21

Fill the Gap
…reactive halogens can displace … reactive halogens from their compounds

Answer 21

More, less

Question 22

What colour is aqueous (aq) Chlorine and what is it

Answer 22

Colourless
Halogen

Question 23

What colour is aqueous (aq) Bromine and what is it

Answer 23

Yellow
Halogen

Question 24

What colour is aqueous (aq) Bromine and what is it

Answer 24

Yellow
Halogen

Question 25

What colour is aqueous (aq) Iodine and what is it

Answer 25

Brown Halogen

Question 26

What colour is aqueous (aq) KCl (Potassium Chloride) and what is it

Answer 26

Colourless Salt

Question 27

What colour is aqueous (aq) KBr (Potassium bromide) and what is it

Answer 27

Colourless Salt

Question 28

What colour is aqueous (aq) KI (Potassium Iodide) and what is it

Answer 28

Colourless Salt

Question 29

KCl + Cl2

Answer 29

No change Stays colourless

Question 30

KCl + Br2

Answer 30

No change Bromine cannot displace chlorine Stays yellow

Question 31

KCl + I2

Answer 31

No change Iodine cannot displace chlorine Stays brown

Question 32

KBr + Cl2

Answer 32

Cl2 + 2KBr —> Br2 + 2KCl Chlorine displaces bromine Colourless -> Yellow

Question 33

KBr + Br2

Answer 33

No change Stays yellow

Question 34

KBr + I2

Answer 34

No change Stays brown

Question 35

KI + Cl2

Answer 35

Cl2 + 2KI —> I2 + 2KCl Chlorine displaces iodine Colourless -> brown

Question 36

KI + Br2

Answer 36

Br2 + 2KI —> I2 + 2KBr Bromine displaces iodine Yellow -> brown

Question 37

KI + I2

Answer 37

No change Stays brown

Question 38

Fill the gap Displacement occurs in the three cells becuase the halogen added is …. Reactive than the halogen present in the …

Answer 38

More, salt

Question 39

True/False The reactivity trend in halogen is Chlorine > Bromine > Iodine > etc

Answer 39

True