Chemical Reaction Engineering
A space time of 3 hours for a flow reactor means that

Conversion is cent per cent after three hours
Three reactor volumes of feed can be processed every hour
It takes three hours to dump the entire volume of the reactor with feed
The time required to process one reactor volume of feed (measured at specified conditions) is 3 hours

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Chemical Reaction Engineering
A Catalyst

Changes the equilibrium constant of the reaction
Increases the equilibrium concentration of the product
Shortens the time to reach the equilibrium
None of these

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Chemical Reaction Engineering
The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the

Reaction is elementary but the molecularity may not be 2
Reaction is elementary with a molecularity of 2
Reaction may be elementary with molecularity of 2
Molecularity of the reaction is 2, but the reaction may not be elementary

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