Reaction of Group 7 Non-metals

Question 1

What is the colour of the alkane (organic) layer if chloride is present?

Answer 1

Pale Green`

Question 2

What is the colour of the alkane (organic) layer if bromide is present?

Answer 2

Yellow/Brown

Question 3

What is the colour of the alkane (organic) layer if iodide is present?

Answer 3

Pink/Purple

Question 4

What is the colour of Chlorine?

Answer 4

yellow/green

Question 5

What colour is Bromine?

Answer 5

red/brown

Question 6

What colour is Iodine?

Answer 6

Violet liquid
Orange/brown solution
grey solid

Question 7

What is displacement?

Answer 7

When a more reactive group 7 element replaces less reactive group 7 metal

Question 8

What do we call an element that oxidises another element?

Answer 8

The stronger oxidising angent

Question 9

What is the equation for purifying water?

Answer 9

Cl2 + H2O –> HCl + HClO
Cl: 0 in Cl2 -> -1 in HCl . Cl gains 1e- . Reduced
Cl: 0 in Cl2 -> +1 in HClO . Cl loses 1e- . Oxidised

Question 10

What are the Advantages and Disadvantages of purifying water?

Answer 10

A - kills bacteria

D - kills you (toxic), produces chlorinated hydrocarbons (causes cancer)

Question 11

What is the equation for making bleach?

Answer 11

Cl2 + 2NaOH –> NaCl + NaOCl + H2O
Cl: 0 in Cl2 -> -1 in NaCl . Cl gains 1e- . Reduced
Cl: 0 in Cl2 -> +1 in NaOCl . Cl loses 1e- . Oxidised