Chapter 5: Hamare Aas-paas Badlaav: Bhautik aur Rasaayanik
Kaagaz modna, barf pighalna, dahi jamna, lohe par jung, mombatti jalna, chattaan bikharna: badlaav har jagah. Is chapter mein bhautik aur rasaayanik badlaav pehchaanna, choone ke paani se carbon dioxide jaanchna, fire triangle samajhna, badlaavon ko ulte-na-ulte aur vaanchhit-avaanchhit mein baantna, aur prakriti ko chattaanein dheere-dheere badalte dekhna seekhenge.
Is chapter mein tum
- bhautik aur rasaayanik badlaav mein fark karna
- choone ke paani se carbon dioxide jaanchna
- jung, dahan aur fire triangle samjhaana
- badlaav ko ulte/na-ulte, vaanchhit/avaanchhit mein baantna
Topics
- Bhautik aur Rasaayanik Badlaav NCERT 5.1–5.2
Bhautik badlaav: sirf aakaar, maap ya avastha; naya padaarth nahi.
- Jung aur Dahan NCERT 5.3
Jung se iron oxide; magnesium jalne se magnesium oxide: dono rasaayanik.
- Ulte Hone Wale, Sthaayi aur Vaanchhit Badlaav NCERT 5.4–5.6
Ulte hone wale badlaav waapas ho sakte; ulte na hone wale nahi, bhautik ho ya rasaayanik.
- Dheeme Praakritik Badlaav NCERT 5.7
Apakshay chattaan todta, bhautik (garmi, barf, jadein) ya rasaayanik (basalt par iron oxide).
Key words
- Physical change
- sirf aakaar, maap ya avastha; naya padaarth nahi
- Chemical change
- jismein naye padaarth bante
- Combustion
- oxygen mein jalkar garmi aur roshni
- Ignition temperature
- sabse kam taapmaan jis par aag pakde
- Rust
- nam hawa mein lohe par bana iron oxide
- Weathering
- chattaanon ka dheere tootna
- Erosion
- tooti chattaan aur mitti ka bah jaana
Summary
- Bhautik badlaav aakaar, maap ya avastha badalte; rasaayanik naye padaarth banaate.
- Carbon dioxide choone ka paani doodhiya; jung aur jalna rasaayanik.
- Dahan ko eendhan, oxygen aur prajvalan taapmaan tak garmi chahiye.
- Badlaav ulte ya na-ulte, vaanchhit ya avaanchhit; apakshay aur kataav dheeme praakritik badlaav.