L4Contact Process

Define what a Catalyst is?

Catalyst- a substance that increases rate of a reaction by lowering activation energy needed, but stays chemically unchanged.

Define a Oxidation state?

Is the charge given to an atom when bonding electrons are assigned by electronegativity rules.

What is redox catalysis?

When one oxidation state reacts with a reactant, and a later reaction restores the original oxidation state.

How does a catalyst increase rate of reaction?

Creates a alternative pathway, with a lower activation energy.

What happens in 1st stage of the contact process?

Sulfur is burned in oxygen S+O2➡SO2

What happens in the 2nd stage of the contact process?

Purified sulfur dioxide is mixed with air and passed over V2O5

Reaction: 2SO2(g)+O2⬅➡2SO3 is reversible and exothermic.

What happens in 3rd stage of the contact process?

In 3rd stage sulfur trioxide is converted into sulfuric acid. SO3 is absorbed in concentrated sulfuric acid to form oleum, it is then diluted.

H2S2O7+ H2SO4+SO3➡2H2SO4