GROUP 7

Question 1

FLOURINE

Answer 1

REACTIVE yellow GAS

Question 2

CHLORINE

Answer 2

Fairly reactive GREEN GAS - POISONOUS

Question 3

BROMINE

Answer 3

RED / BROWN - liquid - gives of ORANGE vapour

! POISONOUS

Question 4

IODINE

Answer 4

BLACK crystalline SOLID - gives off PURPLE VAPOUR

! Antiseptic - good !

Question 5

GROUP 7 properties

Answer 5

• DIATOMIC MOLECULES
  —> form COVALENT bond

DOWN the group :

• M + B point INCRAEASES
• reactivity DECREASES
  —> outermost shell gets FURTHER from NUCLEUS ( atomic radius increases)
  —> FORCES of ATTRACTION that are needed to pull ELECTRON from another atom gets WEAKER

Question 6

HALIDES

Answer 6

• when they gain e- to form -1 ION called HALIDE

Eg. FLOURIDE - CHLORIDE - BROMIDE etc.

! Happened when they react with METALS to form IONIC BOND

Question 7

DISPLACEMENT REACTIONS - REDOX

Answer 7

! MORE reactive halogens displace LESS reactive ones

Eg Cl 2 + KBr —> Br 2 + 2KCl - NEUTRAL CHARGE

displacement reactions = redox reaction - OIL + RIG - BOTH

Half equations

OX :
2Br- —> Br2 + 2e-

RED:

Cl 2 + 2e- —> 2Cl-

Question 8

Reactivity Series

Answer 8

Potatoes , Sizzle , Like crispy munchies , all CARBS zoom in , HEY copper, Silver , Gold Plates

Question 9

REDOX REACTIONS

Answer 9

In IONIC equations - only show particles that CHANGE

! Spectator ions can be ignored

Ca + FeSO4 —> Ca SO4 + Fe - :(
Can get rid of SO4

Ca + Fe2+ —> Ca2+ + Fe - :)