Polycyclic Aromatic Hydrocarbons

Duration: 2 min

This video lesson is available to enrolled students.

Return to /learn/CTET-PAPER-1/environmental-studies-legacy/air-pollution/pollutant-categories-primary-secondary-organic-pollutants/asset-polycyclic-aromatic-hydrocarbons after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. Child Development and Pedagogy: Concept of Pedagogy, Psychology, Child Development, Theories, Personality Development, Individual Differences, Learning and Motivation, Understanding Diverse Learners, Inclusive Education, Mental Health & Life Skills, Teaching-Learning Process, Teaching Methods & Strategies, Experiential Pedagogy, Assessment & Evaluation, National Education Policy (NEP) 2020, Curriculum Framework & Reforms, Miscellaneous Topics, Learners & Learning Process, Factors Affecting Teaching, Methods of Teaching, Classroom Management & Communication, Teaching-Learning Aids & ICT Integration, Curriculum & School Environment, Evaluation, Assessment & Measurement, Inclusive Education & Special Needs
  2. Mathematics: Number System & Place Value, Whole Numbers & Four Operations, Factors, Multiples, Divisibility, HCF & LCM, Fractions & Decimals, Patterns, Ratio, Proportion & Percentage, Measurement — Length, Mass, Capacity, Time, Money, Geometry — Shapes, Lines & Angles, Symmetry, Spatial Understanding, Mensuration — Perimeter, Area, Surface Area, Volume, Data Handling, Graphs & Probability, Mathematics Pedagogy
  3. Environmental Studies: Family & Friends, Relationships, Community, Food & Nutrition, Health & Hygiene, Shelter & Houses, Water (sources, conservation), Travel, Transport & Communication, Things We Make & Do (materials, occupations, crafts), Plants (types, parts, uses), Animals (habitats, features, care), Our Body & Senses, Air, Weather, Sky & Seasons, Maps, Directions & Local Environment, Festivals, Culture & Heritage (India), Environment Conservation, Waste & Pollution, Natural Disasters & Safety, EVS Pedagogy
  4. Language I/II — Hindi: वर्ण-विचार (भाषा, लिपि और वर्णमाला), वर्तनी और वर्ण-विन्यास, शब्द, पद और शब्द-भेद, संज्ञा और सर्वनाम, विशेषण और क्रिया, लिंग, वचन, पुरुष और कारक, काल, वाच्य, वाक्य और वाक्य-भेद, संधि, समास, विलोम शब्द, शब्द-भंडार, सामान्य अशुद्धियाँ (Samanya Ashuddhiyaan), अनेक शब्दों के लिए एक शब्द, मुहावरे और लोकोक्तियाँ, अपठित गद्यांश और अपठित पद्यांश, Multi-Topic Content (Cross-Concept Material), वर्णमाला (Varnmala), वाक्य-शुद्धि, अशुद्धि शोधन और विराम चिह्न, उपसर्ग और प्रत्यय, तत्सम, तद्भव, देशज और विदेशी शब्द, अनेकार्थी और शब्द-युग्म, अलंकार, रस और छंद, शब्दोत्पत्ति एवं भाषा-बोलियाँ, वाक्य-पूर्ति और अनुच्छेद-रचना
  5. Language I/II — English: Noun, Pronoun, Determiner, Articles, Adjectives, Verb, Adverb, Preposition, Conjunction, Interjection, Sentence Structure, Phrases & Clauses, Tenses, Subject Verb Agreement (Verb Noun Agreement), Modals, Active Passive Voice (Voice), Direct and Indirect Speech, Vocabulary, Sentence Construction, Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing)
  6. Language I/II — Sanskrit: वर्ण, उच्चारण, सन्धि, शब्दरूप, धातुरूप, कारक-विभक्ति, समास, प्रत्यय, उपसर्ग, वाच्य, सङ्ख्या, अव्यय, अपठित अवबोधन
  7. Language I/II — Urdu: Spelling & Diacritics, Vocabulary, Grammar (اسم, فعل, صفت, ضمیر), Idioms & Proverbs, Comprehension
  8. Language I/II — Bengali: Grammar, Vocabulary, Idioms & Expressions, Writing & Composition, Comprehension
  9. Language Pedagogy (Language I and II): Language Pedagogy (Hindi/English/Sanskrit/Urdu learning & teaching)
  10. Mathematics (Video Lessons & Notes): Number System, Arithmetic, Divisibility Rules, HCF LCM, Speed Mathematics and Basic Mathematics, Mensuration and Geometry, Statistics, Mental Ability
  11. Environmental Studies (Video Lessons & Notes): Environment, Ecosystem, Biomes & Environmental Issues, Air Pollution, Water Pollution, Soil, Noise Pollution and Waste Management, Natural Resources, Energy & Disaster Management, Global Environmental Conventions – COP, Protocols & ISA, MDG & SDG
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The video presents a lecture on Polycyclic Aromatic Hydrocarbons (PAHs), defining them as a class of organic compounds containing two or more fused aromatic rings, primarily benzene rings. The instructor explains that PAHs are ubiquitous environmental pollutants found in air, water, and soil, originating from both natural processes like forest fires and volcanic activity, and human activities such as burning fossil fuels. The lecture highlights their persistence in the environment and their known toxicity and carcinogenicity. The instructor then lists several examples of PAHs, including naphthalene, acenaphthylene, fluorene, phenanthrene, anthracene, fluoranthene, and pyrene, which are shown on the screen. The presentation is delivered in front of a whiteboard with text and diagrams, and the instructor uses a marker to point to key information.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video begins with a clear definition of Polycyclic Aromatic Hydrocarbons (PAHs) as a class of organic compounds containing two or more fused aromatic rings, primarily benzene rings. The on-screen text explicitly states that PAHs are ubiquitous environmental pollutants found in air, water, and soil. The instructor explains their sources, which include natural processes like forest fires and volcanoes, as well as human activities such as burning fossil fuels. The text also notes that PAHs are known for their toxicity, carcinogenicity, and persistence in the environment. The instructor then introduces a second paragraph explaining that PAHs occur naturally in coal, crude oil, and gasoline, and are generated when these materials are burned, including in cigarette smoke. The video displays a list of examples of PAHs, including naphthalene, acenaphthylene, fluorene, phenanthrene, anthracene, fluoranthene, and pyrene. The instructor uses a green marker to point to different sections of the text, emphasizing key points like the sources and the list of examples.

  2. 2:00 – 2:19 02:00-02:19

    In this segment, the instructor continues to discuss the sources of PAHs, pointing to the text that states they are produced when coal, oil, gas, wood, garbage, and tobacco are burned. The on-screen text also mentions that PAHs can bind to or form small particles in the air. The instructor gestures towards the list of examples, which includes naphthalene, acenaphthylene, fluorene, phenanthrene, anthracene, fluoranthene, and pyrene. The instructor's hand is visible, holding a green marker, and she appears to be explaining the significance of these compounds. The video maintains a focus on the whiteboard, which contains the detailed information about PAHs, their properties, and their sources.

The lecture provides a comprehensive overview of Polycyclic Aromatic Hydrocarbons (PAHs), starting with their chemical definition as fused aromatic ring systems. It then systematically covers their environmental presence, sources (both natural and anthropogenic), and their significant health risks, including toxicity and carcinogenicity. The presentation concludes by listing specific examples of PAHs, reinforcing the concept with concrete chemical names. The flow of information is logical, moving from general definition to specific examples, and is supported by clear visual aids on the whiteboard.

Loading lesson…