P2 2b group 7 (halogens) chlorine bromine and iodine

Question 1

what are the elements in group 7?

Answer 1

fluorine, chlorine, bromine, iodine and astatine

Question 2

why do they all have similar reactions?

Answer 2

they all have seven electrons in the outermost shell

Question 3

what is special about halogens?

Answer 3

they are diatomic

Question 4

what is the state and appearance of fluorine?

Answer 4

yellow gas

Question 5

what is the state and appearance of chlorine?

Answer 5

pale yellow - green gas

Question 6

what is the state and appearance of bromine?

Answer 6

red-brown liquid

Question 7

what is the state and appearance of iodine?

Answer 7

purple - black solid

Question 8

what are the characteristics of fluorine?

Answer 8

very reactive, poisonous gas

Question 9

what are the characteristics of chlorine?

Answer 9

reactive, poisonous and dense gas

Question 10

what are the characteristics of bromine?

Answer 10

dense red brown volatile liquid

Question 11

what are the characteristics of iodine?

Answer 11

shimmery, crystalline, soils, sublimes to form a purple vapour

Question 12

what is the colour of chlorine in a solution?

Answer 12

pale green

Question 13

what is the colour of bromine in a solution?

Answer 13

orange

Question 14

what is the colour of iodine in a solution?

Answer 14

dark brown

Question 15

what happens to the boiling points of halogens?

Answer 15

they increase as they go down the group

Question 16

why do the melting and boiling points increase as you go down group 7?

Answer 16

increasing intermolecular forces as the atoms become larger, so more energy is required to overcome these forces

Question 17

what is the reactivity like in group 7?

Answer 17

the reactivity decreases as you go down the group