Periodicity

Question 1

What is oxidising ability

Answer 1

Halogen willl oxidise another element if they are oxidising another element they are reduced

Question 2

OILRIG

Answer 2

Oxidation
Is
Loss
Reduction
Is
Gain

Question 3

How does reactivity trend change in the halogens

Answer 3

Creases since there is more shielding and decrease in affective nuclear charge making it harder to gain an electron

Question 4

How does melting and boiling point change down th halogens

Answer 4

INcreases due more subatomic particles and more van der waals to break

Question 5

What is disproportionation

Answer 5

Both oxidised and reduced in an equation

Question 6

Why is chlorine added to water

Answer 6

Kills bacteria like cholera
Prevents algae growth
Removes bad tastes

Question 7

Disadvantage of adding chlorine to water

Answer 7

Carcinogenic compounds form

Question 8

Carcinogenic

Answer 8

Causes cancer

Question 9

Hydroxide ions

Answer 9

Sodium hydroxide with red litmus paper goes blue

Question 10

Carbonate ions

Answer 10

Lime water in testube
Sodium carbonate and equal HCL with a bung

Limewater goes cloudy

Question 11

Chloride ions

Answer 11

Potassium chloride in test tube
Drops of sulfuric acid
Damp uBlue litmus paper goes pink

Question 12

Halide ions

Answer 12

Potassium chloride
Drops of sulfuric acid
Filter paper dipped in potassium dichromate does yellow