Reversible Reactions

Manufacture of Sulfuric Acid

• Know and describe the stages in the contact process for the manufacture of sulfuric acid

• Know that vanadium (V) oxide is used a catalyst

I wonder what conditions would affect these reactions?

H2O (s)

Bread

Solid Wax

Water

I can’t quite guess what that symbol

means!

H2O (L)

Toast

Ice

Liquid Wax

Show instructionsHide instructions

Click on the reactants

Click on the detective twice

Click on the thinking cloud to highlight the

equilibrium sign

• Sulfuric acid has many uses in industry.

• The amount of sulfuric acid which a country uses in one yearcan be a measure of that country's economic development(how modern or wealthy it is).

mmm.. My new task is in this

letter. Well lets open it up and

start on the first clue....

Show instructionsHide instructions

Click on the detective

Click on the letter twice

Well without Watson even I

know my task is to find out about the manufacture of sulfuric acid ...

Detective...

Watson..

I have the following raw materials for you

to identify..

Show instructionsHide instructions

Click the slide anywhere until the

speech (I have...)appears

Click the speech (I have the following) – click

twice

Click on the air balloon and then on the piece

of sulfur

I have the Raw materials for you

detective

Sulfur + oxygen

Great, well don’t wait for me lets see what

happens...

sulfur dioxide

Success!

Not yet. We still have to balance the

equation..

S(s) + O2(g) SO2(g)

Can you describe this detective

When sulfur in fossil fuels is burned it produces sulfur dioxide gas.

1. Sulfur found in Fossil Fuels...

Write a Balanced Equation

Write a sentence

to describe

the reaction

Can you finish the reaction..

2. Sulfur Ores

lead sulfide + oxygen

2PbO(s) + 2SO2(g)

Is there another way to make sulfur

dioxide?

Yes,....

... Sulfide ores are heated in airto produce the metal oxide and sulfur

dioxide gas, for example..

2PbS(s) + 3O2(g

lead oxide + sulfur dioxide.

Can you balance

the reaction..

Sulfur is oxidised in the previous reactions

to become sulfur dioxide.

Both reactions are exothermic.

But a)what is Exothermic

b) How is the sulfur dioxide used

2SO3(g)

sulfur dioxide + oxygen sulfur trioxide.

2SO2(g) + O2(g)

The sulfur dioxide gas produced from both of the above

methodsis used to make sulfur trioxide

Write a balanced equation for the

reaction..

There are conditions for this reaction...

And don’t forget that a catalyst is used called.... Vanadium (V) oxide

What does that sign mean! Does it effect

the reaction

WATSON! Stop daydreaming, I am about to explain the sign at

the centre of our investigation... I mean reaction!

This is the sign for a reversible reaction. Pressure and

temperature will have a big impact on the product yield, so in a reversible reaction it is very

important to get it right!

Vanadium (V) oxide

In many industrial processes a compromise temperature is used . To reduce the problem one must look for a way of increasing the rate of a reaction without decreasing the yield i.e. with a catalyst.

An increase in temperature is used to speed up chemical reactions but it can have an undesired effect when the reaction is reversible and exothermic.

A brief summary of the Contact ProcessThe Contact Process:

makes s....

converts the sulphur dioxide into...

converts the sulphur trioxide into....

...ulfur dioxide

... sulphur trioxide (the reversible reaction at the heart of the process);

....concentrated sulphuric acid.

Show instructionsHide instructions

Pupils must join up the correct start to the sentence with the

correct end

To make this more difficult you could just

show the starter sentence

To Summarize

vanadium (V)

oxide is used a

catalyst

Sulfur found in

fossil fuels is

used to make

Sulfur Dioxide

The sulfur dioxide gas produced from both of the above methodsis used to make

sulfur trioxide

Chemistry really is a lot of fun!!

Sulfide ores are heated in airto produce the metal oxide and

sulfur dioxide gas