Some Basic Concepts of Chemistry — Flashcards
Maharashtra Board · Class 11 · Chemistry
25 flashcards for Some Basic Concepts of Chemistry (Maharashtra Board Class 11 Chemistry) to test yourself on key terms and facts.
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What is chemistry and why is it called a central science?
Answer
Chemistry is the study of matter, its physical and chemical properties, and the physical and chemical changes it undergoes under different conditions. It is called a central science because its knowle…
Differentiate between pure substances and mixtures with examples.
Answer
Pure substances: Have definite chemical composition and same properties regardless of origin. Examples: Pure metals, distilled water. Mixtures: Have no definite chemical composition and no definite pr…
Classify elements as metals, non-metals, and metalloids with their characteristic properties.
Answer
Metals: Have lustre, conduct heat and electricity, ductile, malleable. Examples: Gold, silver, copper, iron. Non-metals: No lustre (except diamond, iodine), poor conductors (except graphite), brittle.
What are homogeneous and heterogeneous mixtures? Give examples.
Answer
Homogeneous mixtures: Molecules of constituents are uniformly mixed throughout the bulk. Examples: Solutions (salt water, sugar water). Heterogeneous mixtures: Molecules of constituents are not unifor…
Define physical and chemical properties with examples.
Answer
Physical properties: Can be measured without changing chemical composition. Examples: Color, odour, melting point, boiling point, density. Chemical properties: Substances undergo chemical change with …
What are SI base units? List the seven fundamental quantities with their units.
Answer
SI has seven base units for fundamental quantities: 1. Length (l) - metre (m) 2. Mass (m) - kilogram (kg) 3. Time (t) - second (s) 4. Electric current (I) - ampere (A) 5. Temperature (T) - Kelvin (K) …
Convert between temperature scales: °C, °F, and K
Answer
Conversion formulas: °F = (9/5)(°C) + 32 K = °C + 273.15 Example: 25°C to °F and K: °F = (9/5)(25) + 32 = 45 + 32 = 77°F K = 25 + 273.15 = 298.15 K…
State the Law of Conservation of Mass with an example.
Answer
Law: 'Mass can neither be created nor destroyed in a chemical reaction.' Total mass of reactants = Total mass of products Example: When hydrogen burns with oxygen to form water: 2H₂ + O₂ → 2H₂O 4g + …
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