Some Basic Concepts of Chemistry — Flashcards
ICSE · Class 11 · Chemistry
49 flashcards for Some Basic Concepts of Chemistry (ICSE Class 11 Chemistry) to test yourself on key terms and facts.
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What is matter, and how is it classified physically?
Answer
Matter is anything that has mass and occupies volume. Physical classification of matter is based on state: solids, liquids, and gases. Solids have definite shape and volume, liquids have definite volu…
What are elements, compounds, and mixtures?
Answer
An element is a pure substance that cannot be broken into simpler substances by ordinary physical or chemical methods. A compound is a pure substance formed by chemical combination of two or more diff…
How are homogeneous and heterogeneous mixtures different?
Answer
In a homogeneous mixture, the components are uniformly distributed throughout the sample. In a heterogeneous mixture, the components are not uniformly distributed and different parts may have differen…
Why is water a compound and air a mixture?
Answer
Water is a compound because hydrogen and oxygen are chemically combined in a fixed mass ratio of 1:8 and can be separated only by chemical means. Air is a mixture because its gases are physically mixe…
What is the difference between physical and chemical properties?
Answer
Physical properties can be measured without changing the identity of the substance. Examples include colour, odour, density, melting point, boiling point, and specific heat. Chemical properties involv…
State the Law of Conservation of Mass with the balanced reaction for its laboratory verification.
Answer
During any physical or chemical change, the total mass of products is always equal to the total mass of reactants. It is verified in a special H-shaped Landolt's tube using the reaction: AgNO3(aq) + N…
What happens when calcium carbonate is heated?
Answer
CaCO3(s) → CaO(s) + CO2(g) This is a decomposition reaction. The reaction shows conservation of mass because the total mass of products equals the mass of the reactant.
What is the Law of Constant Composition?
Answer
A chemical compound, no matter from which source it is obtained, always contains the same elements combined together in the same definite proportion by mass. For example, water always contains hydroge…
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