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22 Thermochemistry: MCQ3

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Questions and Answers

What is the fundamental principle of Hess's Law?

The heat change of a reaction depends only on the initial and final states of a reaction (correct)
The heat change of a reaction depends on the catalyst used
The heat change of a reaction depends on the route by which the reaction occurs
The heat change of a reaction depends on the pressure of the system

What is the process of converting straight chain compounds to ring compounds?

Catalytic cracking
Dehydrocyclisation (correct)
Electrolysis
Isomerisation

What is the by-product of the electrolysis of water?

Carbon dioxide and hydrogen
Oxygen and hydrogen (correct)
Hydrogen and methane
Methane and oxygen

What is the purpose of improving the octane number of a fuel?

To improve the fuel's combustion efficiency (D) Signup and view all the answers

What is the primary goal of catalytic cracking?

To produce smaller molecules with higher octane numbers (B) Signup and view all the answers

What is the main reactant in the steam reforming process?

Methane (D) Signup and view all the answers

What is the product of the reaction CO + H₂O →?

CO₂ + H₂ (C) Signup and view all the answers

What is the sign of ∆H for an exothermic reaction?

Negative (C) Signup and view all the answers

What is the octane number a measure of?

The tendency of a fuel to resist auto-ignition (A) Signup and view all the answers

What is the unit of bond energy?

Kilojoules per mole (A) 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 (B) Signup and view all the answers

What is the heat of combustion of a substance?

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

What is the kilogram calorific value of a fuel?

The heat energy produced per kilogram of fuel (B) Signup and view all the answers

What is the heat of formation of a substance?

The heat change when one mole of the substance is formed from its elements in their standard states (D) Signup and view all the answers