OCR GCSE C4 Part 2

What is chlorine (Cl2) used for?

Water treatment to stop diseases

Making plastics, e.g. PVC

CFCs

What is Bromine (Br2) used for?

Drugs

Pesticides

What is Iondine (I2) used for?

Preventing thyroid disease (through diet)

The starting materials for the manafacture of:

medicines

photographic chemicals

dyes

Describe the reaction of between sodium (Na) and chlorine (Cl2)

Hot sodium burns with a bright yellow flame. It priduces clouds of white sodium chloride crystals (NaCl). It’s a vigorous reaction

What does the name halo-gen mean?

Salt-former

What two things can the halogens do?
Bleach things and kill bacteria
ALL alkali metals react with chlorine to give what product?

MCl

Where M = alkali metal and Cl = chlorine

What does (s) stand for?
Solid
What does (l) stand for?
Liquid
What does (aq) stand for?
Aqueous – dissolved in water
What does (g) stand for?
Gas
What is the balanced equation for alkali metals and water?

2M(s) + 2H2O(l) —–> 2MOH(aq) + H2 (g)

 

Where M = alkali metal

What is the balanced equation for alkali metals and halogens?

2M(s) + Ha2 (l) —–> 2MHa(s)

 

Where m= alkali metal and Ha = halogen

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