group 7 (the halogens) (C3) Flashcards Preview

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Flashcards in group 7 (the halogens) (C3) Deck (23):
1

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

it decreases

2

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

it increases

3

what are the first4 elements?

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

4

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

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

5

what is fluoride at room temp?

a poisonous yellow gas

6

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

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

7

what is chloride at room temp?

poisonous dense green gas

8

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

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

9

what is bromide at room temp?

poisonous red/brown liquid

10

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

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

11

what is iodine?

dark grey crystalline solid or a purple vapour

12

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

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

13

how electrons in there outer shell?

7

14

what do the halogens react with?

metals

15

when reacted with a metal what do the form

ionic bonds

16

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

halide

17

what charge do halides have?

-1

18

what can a more reactive halogen do>

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

19

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

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

20

what kind of molecular structures do they have?

simple molecular

21

do they have strong or week covalent bonds?

strong

22

do they have strong or weak intermolular forces?

weak intermolular forces

23

are they poor or good conductors of electricity?

poor conductors