reversable reactions

Question 1

first stage of the contact process symbol and word equation

Answer 1

sulfur + oxygen → sulfur dioxide
S + O2 → SO2
sulfur is burned in the air to make sulfur dioxide

Question 2

Second stage of the concept process

Answer 2

sulfer dioxide is oxidised to make sulfur trioxide (reversible reaction )
sulfur dioxide + oxygen —> sulfur trioxide
SO2 + O2 —> SO3

Question 3

third stage of the contact process

Answer 3

Oleum is then made by dissolving sulfur trioxide in concentrated sulfuric acid.
The oleum is then converted to sulfuric acid by adding water.
SO3 + H2SO4 —> H2S2O7
H2S2O7 + H2O —> 2H2SO4

Question 4

why is sulfer trioxide dissolved in concentrated sulphur dioxide instead of water?

Answer 4

As less heat is produced so it is safer and easier to manage

Question 5

what are the three compromises of conditions to make sulfuric acid

Answer 5

fairly high temps , low pressure and vanadium pentoxide catalyst

Question 6

what is the temp compromise for contact process

Answer 6

Low temperatures favour the forward reaction so more sulfer trioxide is produced and a compromise temp of 450 used however reducing the temperature can slow down a reaction so catalyst is used

Question 7

pressure compromise for the contact process equation

Answer 7

higher pressure favour the forward reaction however increasing the pressure is expensive and the conditions already favour the forward reaction so it is usually carried out at just above atmospheric pressure

Question 8

ammonium sulfate is a _________ made from _______ and ________
_____ and is used in agriculture to improve _____ yields and to make p____ , p________, d___ , d____________, f_______

Answer 8

fertiliser, ammonia, sulphuric acid, crop, paints, plastics, dyes, detergents, fibres

Question 9

what does water of crystallisation mean

Answer 9

when there’s water in a lattice

Question 10

what does a hydrated/anhydrous salt have

Answer 10

water crystallisation or not

Question 11

what acid is good at removing water of crystallisation from hydrated salts such as ______ _________

Answer 11

concentrated sulfuric acid
copper (II) sulfate

Question 12

What is the process of dehydration of hydrated copper sulphate?

Answer 12

when sulfiric acid is added to copper sulfate, it removes the crystallisation of water and turns the copper sulphate crystals into a anhydrous copper sulphate white powder which is very exothermic so lots of heat has given off

Question 13

process of dehydration of sugars

Answer 13

When concentrated sulphuric acid is mixed in with sugar, it turns yellow then brown. It removes hydrogen and oxygen from the sugar forming water and solid carbon is left behind turning the solution black the water which is formed.
dilute the sulphuric acid and generates a lot of heat which causes the water producing steam which causes the carbon to rise out the beaker.

Question 14

symbol equation for ammonia

Answer 14

NH3

Question 15

symbol equation for sulfuric acid

Answer 15

H2SO4