Recent Lessons

Show all results for ""

Feature Overview

Ace your exams with our all-in-one platform for creating and sharing quizzes and tests.

Quizzes

Create quizzes and tests automatically from your content using AI.

Flashcards

Automatically turn your notes into digital flashcards.

Share, Export & Embed

Share with classmates or export to Excel and your learning management system.

Stats & Reporting

Auto-grading quizzes and tests with detailed stats and reports.

Mobile Apps

The smarter way to study – wherever you are.

Pricing

Search...

11 Questions

0 Views

22 Thermochemistry:MCQ1

Choose a study mode

Play Quiz

Study Flashcards

Spaced Repetition

Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

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. 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. 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 Signup and view all the answers

What type of reaction is characterized by heat being given out?

Exothermic Signup and view all the answers

What does the octane number measure?

The tendency of a fuel to resist auto-ignition 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 heat of formation of a substance?

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

What is the kilogram calorific value of a substance?

The amount of heat energy produced per kg of fuel Signup and view all the answers