3.2.3 Group 7(17), the halogens

Question 1

are halogens metals or non metals

Answer 1

non metals

Question 2

are halogens reactive

Answer 2

halogens are highly reactive

Question 3

what colour is fluorine

Answer 3

pale yellow

Question 4

what colour is chlorine

Answer 4

green

Question 5

what colour is bromine

Answer 5

red-brown

Question 6

what colour is iodine

Answer 6

grey

Question 7

physical state of fluorine

Answer 7

gas

Question 8

physical state of chlorine

Answer 8

gas

Question 9

physical state of bromine

Answer 9

liquid

Question 10

physical state of iodine

Answer 10

solid

Question 11

trend in boiling point for halogens:
what is the trend?

Answer 11

boiling point of halogens increases down the group

Question 12

trend in boiling point for halogens:
reasoning for the trend

Answer 12

strength of Van der Waals forces increases down the group as the size and relative mass of the molecules increases

Question 13

trend in electronegativity for halogens:
what is the trend?

Answer 13

electronegativity decreases down the group

Question 14

trend in boiling point for halogens:
reasoning for the trend

Answer 14

larger atoms attract electrons less than smaller ones as outer electrons are further from the nucleus and more shielded, as they have more inner electrons

Question 15

in general, are halogens really electronegative

Answer 15

halogens are highly electronegative elements

Question 16

what happens when halogens react

Answer 16

when the halogens react, they gain an electron

Question 17

are halogens oxidising or reducing agents

Answer 17

halogens are oxidising agents

Question 18

trend in oxidising ability for halogens
what is the trend

Answer 18

halogens become less oxidising down the group

Question 19

trend in oxidising ability for halogens
explanation for trend

Answer 19

get less reactive down the group as atoms become larger and outer shells get further from the nucleus

Question 20

when will halogens displace a halide from solution

Answer 20

a halogen will displace a halide from solution if the halide is below it in the periodic table

Question 21

Displacement reactions
reaction between chlorine water and potassium chloride solution

Answer 21

no reaction

Question 22

Displacement reactions
reaction between bromine water and potassium chloride solution

Answer 22

no reaction

Question 23

Displacement reactions
reaction between iodine solution and potassium chloride solution

Answer 23

no reaction

Question 24

Displacement reactions
reaction between chlorine water and potassium bromide solution

Answer 24

orange solution (Br2) formed

Question 25

Displacement reactions
reaction between bromine water and potassium bromide solution

Answer 25

no reaction

Question 26

Displacement reactions
reaction between iodine solution and potassium bromide solution

Answer 26

no reaction

Question 27

Displacement reactions
reaction between iodine solution and potassium iodide solution

Answer 27

no reaction

Question 28

Displacement reactions
reaction between bromine water and potassium bromide solution

Answer 28

brown solution (I2) formed

Question 29

Displacement reactions
reaction between chlorine water and potassium bromide solution

Answer 29

brown solution (I2) formed

Question 30

what colour is chlorine water

Answer 30

colourless

Question 31

what colour is bromine water

Answer 31

orange

Question 32

what colour is iodine solution

Answer 32

brown

Question 33

what colour is potassium chloride solution

Answer 33

colourless

Question 34

what colour is potassium bromide solution

Answer 34

colourless

Question 35

what colour is potassium iodide solution

Answer 35

colourless

Question 36

what can displacement reactions be used to help with?

Answer 36

displacement reactions can be used to help identify with halogen (or halide) is present in a solution

Question 37

what can displacement reactions be used to help with?
why?

Answer 37

halide ions are colourless in solution, but when the halogen is displaced it shows a distinctive colour