14 Questions
What is the primary factor that determines the heat change of a reaction, according to Hess's Law?
The initial and final states of the reaction
What is the purpose of isomerisation in improving the octane number of heptane?
To form a more branched isomer
What is the products of the steam reforming process?
CO₂ + H₂
What is the name of the process that involves breaking down large molecules into smaller ones with higher octane numbers?
Catalytic cracking
What is the purpose of dehydrocyclisation in refining petroleum?
To convert straight compounds to ring compounds
What is the primary product of the electrolysis of water?
Hydrogen and oxygen
What is the name of the gas that is produced by steam reforming of methane?
Domestic gas
What is the term for a reaction in which heat is given out?
Exothermic
What is the unit of measurement for the bond energy of a molecule?
Kilojoules
What is the significance of the octane number of a fuel?
It measures the tendency of a fuel to resist auto-ignition
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
What is the Law of Conservation of Energy?
Energy cannot be created or destroyed, but can change from one form to another
What is the term for the heat of reaction of a chemical reaction?
Heat of reaction
What is the significance of 2,2,4-trimethylpentane in the octane scale?
It is the standard for octane number 100
Quiz about thermochemistry, focusing on exothermic and endothermic reactions, heat of reaction, and octane number in car engines.
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