Topic 6 Flashcards
1
Q
As alkalines go down the group:
A
- melting / boiling point decreases
- reactivity with water + oxygen increases
- density increases
- ram increses
2
Q
Lithium reacting with water:
A
- fizzing
- skates on top of water
- until dissolves
- releases hydrogen
3
Q
Sodium reacting with water:
A
- more vigorously than lithium
- red flame
- forms ball on water
- dissolves faster
4
Q
Potassium reacting with water:
A
- lilac flame
- violent fizzing
5
Q
why do elements further down the group more reactive?
A
- as elements go down the group there’s more shielding
- the electron in the outermost shell gets further away from the positive nucleus
- the further away it is, the weaker the forces of attraction is so it’s easily lost
6
Q
halogen properties
A
- becomes darker down the group
- non - metal
- toxic
- corrosive
- boiling / melting point increases
7
Q
florine
A
gas
pale green
8
Q
chlorine
A
gas
greenish yellow
9
Q
bromine
A
liquid
red/brown
10
Q
Iodine
A
solid
gray (sublimes to purple gas)
11
Q
At
A
solid
black (radioactive)
12
Q
halogens uses
A
disinfectants:
they can kill all microorganisms
e.g. swimming pools
13
Q
alkalines react with
A
oxygen to form metal oxides
water to form metal hydroxides
chlorine to form metal chlorides
14
Q
Nobel gases
A
are inert as they have full outer shell of electrons so doesn’t need to loose or gain any
15
Q
helium
A
used in balloons and airships
LESS DENCE than air so float
not flamable
