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Study of the First Element - Hydrogen — Chapter Summary

ICSE · Class 9 · Chemistry

Summary of Study of the First Element - Hydrogen for ICSE Class 9 Chemistry. Part of the ICSE Class 9 Chemistry syllabus.

44 questions40 flashcards9 formulas & key relations5 concepts

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An infographic illustrating hydrogen's similarities to both Group 1 (alkali metals) and Group 17 (halogens) elements, explaining why its position is unique and debated.
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Overview

Hydrogen is the first element of the periodic table. It has atomic number 1, symbol H, molecular formula H2, valency 1, and electronic configuration 1 in the K shell. It is a non-metal, yet it is placed in Group 1A and included in the activity series because it can form a positive ion. Hydrogen show

Key Concepts

Hydrogen has atomic number 1

Hydrogen has atomic number 1, one valence electron, and electronic configuration 1. It is placed in the 1st period and Group 1A. Its position is contr

Hydrogen resembles alkali metals because it

Hydrogen resembles alkali metals because it has one valence electron, valency 1, forms H+, and acts as a reducing agent. It also resembles halogens be

Henry Cavendish prepared hydrogen from iron

Henry Cavendish prepared hydrogen from iron and dilute acids in 1766 and showed that water is formed when it burns in air. He called it inflammable ai

Hydrogen is found in traces

Hydrogen is found in traces in the earth's crust, atmosphere, volcanic gases, and in the atmospheres of the Sun and stars. In combined state, it occur

Very reactive metals like potassium

Very reactive metals like potassium, sodium, and calcium react with cold water to form hydroxides and hydrogen. Magnesium reacts slowly with boiling w

Learning Objectives

  • Understand the position of hydrogen in the periodic table and its dual nature.
  • Recall the discovery of hydrogen and the origin of its name.
  • Describe the occurrence of hydrogen in free and combined states.
  • Explain how hydrogen is prepared from water, dilute acids, and alkalis.
  • Apply the activity series to hydrogen preparation and displacement reactions.

Frequently Asked Questions

What are the important topics in Study of the First Element - Hydrogen for ICSE Class 9 Chemistry?
Key topics in Study of the First Element - Hydrogen include Position, nature, and discovery of hydrogen, Hydrogen from water, acids, and alkalis, Laboratory preparation, purification, and collection of hydrogen, Industrial preparation, properties, and uses of hydrogen. Study these first, then practise questions on each for Class 9 exams.
How should I revise Study of the First Element - Hydrogen for Class 9 exams?
Learn the core ideas first, then work through the 44 practice questions on Study of the First Element - Hydrogen. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

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

More resources for Study of the First Element - Hydrogen

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