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Important Questions

Chemical Changes and Reactions — Important Questions

ICSE · Class 9 · Chemistry

43 important questions from Chemical Changes and Reactions for ICSE Class 9 Chemistry, with answers. Part of the ICSE Class 9 Chemistry syllabus.

43 questions36 flashcards9 formulas & key relations5 concepts

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An infographic illustrating various conditions required for chemical reactions to occur, such as close contact, solution, heat, light, electricity, pressure, and catalysts, with a simple example for e
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43 Questions·
multiple choicemultiple correcttrue falsetext answermatching

Important Questions from Chemical Changes and Reactions

1multiple correct

Which conditions are necessary for chemical reactions to occur?

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Mixing the substances in close contact, Supplying heat, Supplying light, Passing electricity

A chemical change can occur when reactant particles collide, and collisions happen when substances are brought into close contact or when energy is supplied. The chapter lists mixing, heat, light, electricity, pressure, and catalysts as conditions that can bring about reactions. Keeping reactants separated does not help collisions occur, so it is not a necessary condition.

2true false

Photosynthesis is an example of an endothermic reaction.

Show answer

True

Photosynthesis is an endothermic reaction because it requires energy input from sunlight to convert carbon dioxide and water into glucose and oxygen. Energy is absorbed during this process.

3text answer

Which gas is evolved when zinc reacts with dilute sulfuric acid?

4matching

Match the following reactions with their types:

+39 more questions on Chemical Changes and Reactions (ICSE Class 9 Chemistry)

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Frequently Asked Questions

What are the important topics in Chemical Changes and Reactions for ICSE Class 9 Chemistry?
Key topics in Chemical Changes and Reactions include Chemical Reaction and Its Signs, Types of Chemical Reactions, Decomposition, Reversible Reactions, and Thermal Dissociation, Catalysts, Promoters, and Activity Series. Study these first, then practise questions on each for Class 9 exams.
How many important questions are there in Chemical Changes and Reactions?
Super Tutor has 43 practice questions for Chemical Changes and Reactions, including multiple choice, multiple correct, true false, text answer, matching questions. A sample with answers is on this page.

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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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