ES 1

Question 1

What are halogens?

Answer 1

The elements in group 7 of the periodic table

Question 2

What are halides?

Answer 2

Group 7 ions or salts

Question 3

Are all halogens diatomic?

Answer 3

Yes

Question 4

How do halogen atoms achieve stability?

Answer 4

• gaining an electron from a metal atom
• which forms a halide ion compound
  -OR
• Sharing an electron from another non-metal atom in a covalently bonded compound

Question 5

Appearance of F2 at room temp

Answer 5

Pale yellow gas

Question 6

Appearance of Cl2 at room temp

Answer 6

Green gas

Question 7

Appearance of Br2 at room temp

Answer 7

Orange liquid

Question 8

Appearance of I2 at room temp

Answer 8

shiny grey/ black solid

Question 9

What happens to reactivity down group 7?

Answer 9

Decreases

Question 10

What happens to MP/BP down group 7?

Answer 10

Increases

Question 11

Which element in group 7 is the best oxidising agent?

Answer 11

Flourine (top)

Question 12

What are spectator ions?

Answer 12

Ions that are left out of ionic equations because they are unchanged

Question 13

What gets reduced in a halogen + halide ion reaction?

Answer 13

The oxidising agent (the halogen)

Question 14

Half equation for halogen

Question 15

What is a silver halide?

Answer 15

A precipitate

Question 16

When are silver halides precipitated?

Answer 16

When a silver ion is added to a solution containing any halide

Question 17

Ag+(aq) + X-(aq) ->

Answer 17

AgX(s)

Question 18

What colour is AgCl?

Answer 18

White precipitate

Question 19

What colour is AgBr?

Answer 19

Cream precipitate

Question 20

What colour is AgI?

Answer 20

Pale yellow precipitate

Question 21

Observations when AgNO3 is added to Cl-

Answer 21

White precipitate

Question 22

Observations when AhNO3 is added to Br-

Answer 22

Cream precipitate

Question 23

Observations when AhNO3 is added to I-

Answer 23

Yellow precipitate

Question 24

What happens when you add NH3 to Cl-, Br- or I-?

Answer 24

Cl- dissolves in dilute ammonia
Br- dissolves in concentrated ammonia
I- does not dissolve

Question 25

What happens to solubility down group 7?

Answer 25

Decreases

Question 26

What is observed when a sodium halide gas is produced?

Answer 26

Steamy white fumes

Question 27

What is the trend in reducing ability of halide ions?

Answer 27

Increases down the group

Question 28

What are the Colours of the elements in vapor state down group 7?

Answer 28

Colourless Yellow Orange Purple Dark purple

Question 29

Color of aqueous Cl, Br and I

Answer 29

Chlorine - pale green Bromine - orange Iodine - Brown

Question 30

Colours of Cl, Br and I in cyclohexane

Answer 30

Cl - pale green Br - red/brown I - violet/purple

Question 31

Cl, Br, I appearance and state a RT

Answer 31

Cl - green gas Br - orange liquid I - Dark grey solid

Question 32

How to test for halide ions

Answer 32

Add AgNO3

Question 33

Ag+ (aq) + Cl-(aq) —> ?

Answer 33

AgCl