22 Thermochemistry:MCQ1

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Questions and Answers

What is the main principle of Hess's Law?

The heat change of a reaction depends on the temperature of the reaction.
The heat change of a reaction depends on the speed of the reaction.
The heat change of a reaction depends only on the initial and final states of the reaction. (correct)
The heat change of a reaction depends on the catalyst used.

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

To make the fuel more suitable for high compression engines. (correct)
To increase the energy density of the fuel.
To decrease the efficiency of the engine.
To reduce the volatility of the fuel.

What is the main product of electrolysis of water?

Oxygen and hydrogen peroxide.
Water and heat.
Hydrogen and oxygen. (correct)
Carbon dioxide and methane.

What is the purpose of dehydrocyclisation in fuel refining?

To convert straight compounds into ring compounds. (D) Signup and view all the answers

What is the main purpose of catalytic cracking in fuel refining?

To break down large molecules into smaller ones with higher octane numbers. (D) Signup and view all the answers

What is the heat of reaction (H) of a chemical reaction?

The heat change in kilojoules when the number of moles of reactants indicated in the balanced equation describing the reaction react completely (A) Signup and view all the answers