ICSE Class 9 Chemistry — Flashcards for Quick Revision

A: A symbol is the short form that stands for the atom of a specific element or the abbreviation used for the names of elements. Examples: H for Hydrogen, O for Oxygen, Ca for Calcium. The first letter i

A: Some symbols are based on Latin names of elements. Examples: Gold (Au) from Aurum, Silver (Ag) from Argentum, Sodium (Na) from Natrium, Iron (Fe) from Ferrum, Copper (Cu) from Cuprum.

A: Valency is the combining capacity of an atom or radical. Modern Definition: The number of electrons that an atom can lose, gain, or share during a chemical reaction is called its valency. It determine

A: A chemical reaction is the process of breaking the chemical bonds of the reacting substances (reactants) and making new bonds to form new substances (products). During this process, the chemical compo

A: A chemical bond is the force that holds the atoms of a molecule together, as in a compound. It is responsible for keeping atoms connected to form molecules and compounds.

A: 1. Mixing (close contact) - substances in solid state 2. Solution - substances in molten or aqueous state 3. Heat - energy supplied through heating 4. Light - photochemical reactions 5. Electricity -

A: Formula: H₂O Chemical name: Dihydrogen oxide Molecular mass: 2 × 1 + 16 × 1 = 18 amu Water has a bent structure with covalent bonding between hydrogen and oxygen atoms.

A: Water is called the universal solvent because: 1. It dissolves many substances forming aqueous solutions 2. It has a high dielectric constant 3. It reduces electrostatic forces between ions 4. It diss

A: Anomalous expansion: Water contracts when cooled from 100°C to 4°C, but below 4°C it starts expanding until it freezes at 0°C. Importance: 1. Water has maximum density at 4°C (1 g/cm³) 2. Ice floats