C5.3.3 - Choosing Reaction Conditions Flashcards

1
Q

How is methanol made?

A

Reacting carbon monoxide with hydrogen

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2
Q

What is the equilibrium yield?

A

The amount of desired product present in a reaction at equilibrium

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3
Q

What factors do the equilibrium yield depend upon?

A

Pressure, temperature and concentration of reactants

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4
Q

What is Le Chatelier’s principle?

A

When a change is made to a reaction at equilibrium, the position of equilibrium moves to oppose the change

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5
Q

What are the negatives of using high pressures to obtain high equilibrium yields?

A

They need a lot of energy to run

They can be hazardous

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6
Q

Why do chemical engineers have to choose a compromise pressure for equilibrium yields?

A

If the pressure is too low they will not get enough equilibrium yield, and if it is will take a lot of energy and can be hazardous

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7
Q

What are the negatives of using low temperatures to obtain high equilibrium yields?

A

It can result in a lower equilibrium yield

Slower rate of reaction

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8
Q

Why do chemical engineers have to choose a compromise temperature for equilibrium yields?

A

If the forward reaction is endothermic, the temperature needs to be low so the equilibrium yield will be high, but the rate of reaction will be low

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