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Study of the First Element - Hydrogen — Flashcards

ICSE · Class 9 · Chemistry

40 flashcards for Study of the First Element - Hydrogen (ICSE Class 9 Chemistry) to test yourself on key terms and facts.

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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40 Flashcards·
Position of hydrogenBasic propertiesHydrogen from water
Card 1Position of hydrogen

Why is hydrogen placed at the top of the periodic table and why is its position controversial?

Answer

Hydrogen has atomic number 1, one electron in its valence shell, and valency 1. It is placed in the 1st Period and Group 1A. Its position is controversial because it resembles alkali metals in some wa…

Card 2Basic properties

What is the electronic configuration, symbol, molecular formula, and valency of hydrogen?

Answer

Symbol: H. Molecular formula: H2. Electronic configuration: 1 in the K shell. Valency: 1. Hydrogen is the first element of the periodic table and has atomic number 1.

Card 3Hydrogen from water

State the balanced equation for potassium reacting with cold water.

Answer

Balanced equation: 2K(s) + 2H2O(l) → 2KOH(aq) + H2(g). The reaction is highly exothermic and vigorous. Potassium floats, melts, and burns with a lilac flame.

Card 4Hydrogen from water

State the balanced equation for sodium reacting with cold water.

Answer

Balanced equation: 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g). Sodium floats on water, melts into a silvery globule, and the reaction is less vigorous than potassium.

Card 5Hydrogen from water

State the balanced equation for calcium reacting with cold water and give the observation.

Answer

Balanced equation: Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g). Calcium sinks in water and forms a milky, turbid alkaline solution because calcium hydroxide is formed.

Card 6Hydrogen from water

State the balanced equation for magnesium reacting with boiling water.

Answer

Balanced equation: Mg(s) + 2H2O(l) → Mg(OH)2(aq) + H2(g). Magnesium reacts slowly with boiling water and liberates hydrogen.

Card 7Hydrogen from water

State the balanced equation for magnesium reacting with steam.

Answer

Balanced equation: Mg(s) + H2O(g) → MgO(s) + H2(g). Magnesium burns in steam with intense white light and forms magnesium oxide.

Card 8Hydrogen from water

State the balanced equation for aluminium reacting with steam at high temperature.

Answer

Balanced equation: 2Al(s) + 3H2O(g) →(800°C) Al2O3(s) + 3H2(g). Aluminium forms a protective oxide coating, but at high temperature the coating breaks and the reaction continues.

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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 many flashcards are available for Study of the First Element - Hydrogen?
There are 40 flashcards for Study of the First Element - Hydrogen covering key definitions, facts and ideas. A few sample cards are shown on this page.
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.

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