Mole Concept and Stoichiometry
ICSE · Class 10 · Chemistry
Flashcards for Mole Concept and Stoichiometry — ICSE Class 10 Chemistry. Quick Q&A cards covering key concepts, definitions, and formulas.
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Get startedState Gay Lussac's Law of Combining Volumes.
Answer
When two or more gases react together, their volumes bear simple whole number ratio with one another and to the volume of products, if they are also gaseous, provided all volumes are measured under id…
What is Avogadro's Law?
Answer
Under identical conditions of temperature and pressure, equal volumes of all gases contain equal number of molecules. This means 1 litre of any gas at STP contains the same number of molecules (2.687 …
Define atomicity and give examples of diatomic molecules.
Answer
Atomicity is the number of atoms present in one molecule of a substance. Diatomic molecules contain 2 atoms per molecule. Examples: H₂, O₂, N₂, Cl₂, Br₂, HCl, NO. These can be determined using Avogadr…
What is vapour density and how is it related to molecular mass?
Answer
Vapour density is the ratio of mass of a certain volume of gas to the mass of same volume of hydrogen at same temperature and pressure. Relationship: Molecular mass = 2 × Vapour density. This relation…
What are the standard conditions STP and SATP?
Answer
STP (Standard Temperature and Pressure): 0°C (273 K) and 1 atm (760 mmHg). Volume of 1 mole gas = 22.4 L. SATP (Standard Ambient Temperature and Pressure): 25°C (298 K) and 1 bar pressure. Volume of 1…
Define relative atomic mass and the current standard used.
Answer
Relative atomic mass is the average relative mass of an atom compared to 1/12 the mass of an atom of C¹². Current standard: C¹² isotope is assigned exactly 12.000 amu. 1 amu = 1/12 × mass of C¹² atom …
Why do some elements have fractional atomic masses? Give an example.
Answer
Elements have fractional atomic masses due to isotopes. The atomic mass is the weighted average of masses of all isotopes based on their natural abundance. Example: Chlorine has Cl³⁵ and Cl³⁷ in 3:1 r…
What is Avogadro's number and what does it represent?
Answer
Avogadro's number (Nₐ) = 6.023 × 10²³. It represents: • Number of atoms in 12 g of C¹² • Number of atoms in 1 gram atom of any element • Number of molecules in 1 gram molecule of any substance • Numbe…
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