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22 Thermochemistry:MCQ2

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Questions and Answers

What is the primary factor that determines the heat change of a reaction, according to Hess's Law?

The route by which the reaction occurs

The catalyst used in the reaction

The temperature at which the reaction takes place

The initial and final states of the reaction (correct)

What is the purpose of isomerisation in improving the octane number of heptane?

To convert straight compounds to ring compounds

To break down large molecules into smaller ones

To form a more branched isomer (correct)

To produce hydrogen through electrolysis of water

What is the products of the steam reforming process?

CH₄ + H₂O

CO₂ + H₂O

CO₂ + H₂ (correct)

CO + 3H₂

What is the name of the process that involves breaking down large molecules into smaller ones with higher octane numbers?

Catalytic cracking Signup and view all the answers

What is the purpose of dehydrocyclisation in refining petroleum?

To convert straight compounds to ring compounds Signup and view all the answers

What is the primary product of the electrolysis of water?

Hydrogen and oxygen Signup and view all the answers

What is the name of the gas that is produced by steam reforming of methane?

Hydrogen Signup and view all the answers

What is the term for a reaction in which heat is given out?

Exothermic Signup and view all the answers

What is the unit of measurement for the bond energy of a molecule?

Kilojoules Signup and view all the answers

What is the significance of the octane number of a fuel?

It measures the tendency of a fuel to resist auto-ignition Signup and view all the answers

What is the heat of combustion of a substance?

The heat change in kilojoules when one mole of a substance is completely burned in excess oxygen Signup and view all the answers

What is the Law of Conservation of Energy?

Energy cannot be created or destroyed, but can change from one form to another Signup and view all the answers

What is the term for the heat of reaction of a chemical reaction?

Heat of reaction Signup and view all the answers

What is the significance of 2,2,4-trimethylpentane in the octane scale?

It is the standard for octane number 100 Signup and view all the answers