group 7 (the halogens) (C3)

Question 1

what happens the reactivity the further down the group you go?

Answer 1

it decreases

Question 2

what happens to melting and boiling point the further down the group you go

Answer 2

it increases

Question 3

what are the first4 elements?

Answer 3

fluoride (F), chloride (Cl), bromide (Br), iodine (I)

Question 4

what is the m.p. and b.p. of fluoride?

Answer 4

m.p.= -220 degrees C, b.p.= -188 degrees C

Question 5

what is fluoride at room temp?

Answer 5

a poisonous yellow gas

Question 6

what is the m.p. and b.p. of chloride?

Answer 6

m.p.= -101 degrees C, b.p.= -34 degrees C

Question 7

what is chloride at room temp?

Answer 7

poisonous dense green gas

Question 8

what is the m.p. and b.p. of bromide?

Answer 8

m.p.= -7 degrees C, b.p.= 58 degrees C

Question 9

what is bromide at room temp?

Answer 9

poisonous red/brown liquid

Question 10

what is the m.p. and b.p. of iodine?

Answer 10

m.p.= 114 degrees C, b.p.= 183 degrees C

Question 11

what is iodine?

Answer 11

dark grey crystalline solid or a purple vapour

Question 12

why do the elements get less reactive the further down the group you go?

Answer 12

as it becomes harder to gain an electron as the outer shell is further away from the nucleus

Question 13

how electrons in there outer shell?

Answer 13

7

Question 14

what do the halogens react with?

Answer 14

metals

Question 15

when reacted with a metal what do the form

Answer 15

ionic bonds

Question 16

when bonded with a metal what can the halogens be called?

Answer 16

halide

Question 17

what charge do halides have?

Answer 17

-1

Question 18

what can a more reactive halogen do>

Answer 18

displace a less reactive halogen from an aqueous solution of its salt

Question 19

give an example of a displacement reaction? (in symbols)

Answer 19

Cl^2 + 2KL -> I^2 + 2KCl (where ^2 means little 2)

Question 20

what kind of molecular structures do they have?

Answer 20

simple molecular

Question 21

do they have strong or week covalent bonds?

Answer 21

strong

Question 22

do they have strong or weak intermolular forces?

Answer 22

weak intermolular forces

Question 23

are they poor or good conductors of electricity?

Answer 23

poor conductors