Some Basic Concepts of Chemistry
CBSE · Class 11 · Chemistry
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What is matter? Give the definition and provide two examples.
Answer
Matter is anything that has mass and occupies space. Examples: Books, water, air, living beings. All substances around us are composed of matter as they have mass and occupy space.
Compare the three states of matter based on particle arrangement and movement.
Answer
Solids: Particles held very close in orderly fashion, limited movement, definite volume and shape. Liquids: Particles close but can move around, definite volume but no definite shape. Gases: Particles…
What is the difference between homogeneous and heterogeneous mixtures? Give one example of each.
Answer
Homogeneous mixture: Components completely mix, uniform composition throughout. Example: Sugar solution in water. Heterogeneous mixture: Composition not uniform, different components may be visible. E…
Distinguish between elements and compounds with examples.
Answer
Elements: Contain only one type of atom. Examples: Sodium, copper, hydrogen, oxygen. Compounds: Formed when atoms of different elements combine in definite ratio. Examples: Water (H₂O), carbon dioxide…
What are the seven SI base units? Name the physical quantity, unit name, and symbol for each.
Answer
1. Length - metre (m), 2. Mass - kilogram (kg), 3. Time - second (s), 4. Electric current - ampere (A), 5. Temperature - kelvin (K), 6. Amount of substance - mole (mol), 7. Luminous intensity - candel…
What is the difference between mass and weight?
Answer
Mass: Amount of matter present in a substance, remains constant everywhere, measured in kg or g. Weight: Force exerted by gravity on an object, varies with location due to gravity changes, depends on …
Define density and write its formula. What are its SI units?
Answer
Density is the amount of mass per unit volume of a substance. Formula: Density = Mass/Volume. SI unit: kg/m³ or kg m⁻³. In chemistry, often expressed as g/cm³.
Convert 25°C to Kelvin and Fahrenheit scales.
Answer
Kelvin: K = °C + 273.15 = 25 + 273.15 = 298.15 K. Fahrenheit: °F = (9/5)(°C) + 32 = (9/5)(25) + 32 = 45 + 32 = 77°F…
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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