Halogens

Question 1

Explain the trend in reactivity down the halogen group

Answer 1

Down the group it become harder to gain electron because larger atoms the increase amount of shielding making it harder for elections to be attracted and gained

Question 2

What is the equation for bronide ion and chlorine

Answer 2

Cl2 +Br- = 2cl- + Br2

Question 3

chlorine at room temp

Answer 3

green gas

Question 4

bromine at room temp

Answer 4

red-brown liquid

Question 5

iodine at room temp

Answer 5

grey solid

Question 6

chlorine appearance in water solution

Answer 6

colourless solution

Question 7

bromines appearance in water solution

Answer 7

orange solution

Question 8

iodine’s appearance in water solution

Answer 8

brown solution

Question 9

chlorine colour in hydrocarbon solvent

Answer 9

colourless solution

Question 10

colour of bromine in a hydrocarbon solvent

Answer 10

orange solution

Question 11

colour of iodine in hydrocarbon solvent

Answer 11

pink solution

Question 12

what happens to electronegativity down the halogens and why

Answer 12

decreases as the atomic radius increases causing outmost electrons to be further away from the nucleus and weaker forces due to increased shielding, decreasing the attraction of electrons to the atom

Question 13

the equation of the production of HBr with sulfuric acid and physical observation

Answer 13

NaBr + H2SO4 = NaHSO4 + HBr

steamy fumes

Question 14

the equation of the production of brown fumes through the oxidation of Br- using H2SO4

Answer 14

2HBr + H2SO4 = Br2 + SO2 + 2H2O

Question 15

Production of SO2 from Br- reducing H2SO4 and physical observation

Answer 15

2HBr + H2SO4 = Br2 + SO2 + 2H2O

Question 16

pneumonic for the reducing power of I-

Answer 16

Silly-steamy fumes
People- purple fumes
Can’t- colourless gas
Sell- Solid (yellow)
Guns-gas (bad egg smell)

Question 17

what product of I- as a reducing agent creates the bad egg smell

Answer 17

H2S

Question 18

what product of I- as a reducing agent creates purple fumes

Answer 18

I2 (iodine)

Question 19

what product of I- as a reducing agent creates steamy fumes

Answer 19

HI

Question 20

equation of production of SO2

Answer 20

2I- + H2SO4 + 2H+ = I2 + SO2 + 2H2O

Question 21

what happens to reducing power down the halogens

Answer 21

As you go down the group, halide ions get bigger, the larger the atomic radius the easier it is to loose electrons therefor reducing power increases.

Question 21

what is the test for halide ions

Answer 21

. add nitric acid (removes any ions that could give a precipitate)
.add silver nitrate ( produces a precipitate for halide ions)
.add ammonia conc and dilute (to see if precipitate redissolves to help distinguish ions)

Question 22

what is the chemical equation for Chloride ions hot

Question 22

acid rain equation halide

Question 22

bad egg smell halide equation

Question 23

HI halide equation

Question 24

I2 halide equation