Roz ki Zindagi mein Elements, Compounds aur Mixtures
Rasoi se pul tak, dawai se mobile tak: har jagah yahi teen dost chhupe hain! 🏠🌉📱
🧭 Is Post Mein
📖 Kahani: Rasoi ki Mez par Science Class
Ravivaar ki subah Golu ko homework mila: “Ghar ki 10 cheezein dhoondho aur batao ki woh element hain, compound hain ya mixture.” Golu notebook le kar seedha rasoi pahunch gaya.
Mez par tha: steel ka pressure cooker, tambe ka lota, peetal ka glass, ek katori namak, ek glass nimbu paani aur aluminium foil ka roll.
Tabhi Priya aur Rohan bhi aa gaye. Rohan ne jhat se kaha: “Aasaan hai! Cooker steel ka hai, steel ek metal hai, toh element!”
Priya ne sir hilaya: “Ruko. Mummy kehti hain steel mein loha ke saath aur cheezein bhi milayi jaati hain. Phir toh woh mixture hua na?”
Golu soch mein pad gaya: “Aur namak? Usme sodium hai, jo pani mein daalo toh aag pakad leta hai! Phir hum use khaate kaise hain?”
Aaj hum yahi dekhenge: ghar, sheher, hospital aur khet mein elements, compounds aur mixtures kahan-kahan hain, aur hum unhe kyun chunte hain. 🔍
🎯 Is Post Mein Kya Seekhenge
- Rasoi ki cheezon ko element, compound aur mixture mein pehchaanna
- Hawa aur paani: ek mixture, ek compound, aur dono hamari zindagi ke liye zaroori
- Ghar aur pul banane mein loha, aluminium, steel aur concrete ka kaam
- Dawai, khaad (fertiliser), mobile phone aur naye materials mein chemistry ka role
- Alloys (jaise stainless steel, peetal, kansa) kyun banate hain, aur “22 carat sona” ka asli matlab
🧱 Basics: Pehle Yeh Aana Chahiye
1. Element: sabse saral pure padarth, jise chemical tareeke se aur saral padarthon mein toda nahi ja sakta, jaise tamba (Cu), oxygen (O). (Post 4: Elements)
2. Compound: do ya zyada elements ka fixed anupaat mein chemical jod, jaise paani (H₂O), namak (NaCl). (Post 5: Compounds)
3. Mixture: do ya zyada padarth jo bina chemical jod ke, kisi bhi anupaat mein mile hain, jaise nimbu paani. (Post 1: Mixture Kya Hai?)
4. Pehchaan ka sawaal: “jude hain ya bas mile hain?” Is farq ko detail mein padhna ho toh dekho Post 6: Mixture vs Compound.
💡 Concept: Teen Dost, Har Jagah
1️⃣ Pehle ek aasaan niyam
Isi liye roz ki zindagi mein mixtures sabse zyada milte hain, compounds usse kam, aur bilkul shuddh elements sabse kam.
2️⃣ Hawa aur paani: zindagi ke do sahaare
- Hawa ek mixture hai. Isme lagbhag 78% nitrogen, 21% oxygen, kareeb 1% argon, thodi si carbon dioxide aur kuch paani ki bhaap hoti hai. Har gas apne gun rakhti hai: oxygen se hum saans lete hain, carbon dioxide se paudhe khaana banate hain.
- Paani ek compound hai (H₂O): hydrogen aur oxygen chemically jude hain. Hydrogen jalne wali gas hai aur oxygen jalne mein madad karti hai, par dono se bana paani aag bujhata hai. Naye gun!
3️⃣ Rasoi mein
- Elements: tambe ka lota (copper), aluminium foil aur kadhai (aluminium). Inme lagbhag ek hi tarah ke atom hain.
- Compounds: namak (sodium chloride, NaCl), cheeni (carbon, hydrogen, oxygen ka compound), baking soda (sodium hydrogen carbonate), paani.
- Mixtures: chai, doodh, nimbu paani, sirka (vinegar: paani mein thoda acetic acid), LPG gas (mainly propane aur butane gas), steel ke bartan, peetal ka glass.
4️⃣ Ghar, pul aur gaadiyan
- Loha aur aluminium pul, imaarat aur gaadiyon mein lagte hain. Loha zyadatar steel ke roop mein lagta hai: loha + thoda carbon, yaani ek alloy (mixture), jo shuddh lohe se zyada mazboot hai.
- Stainless steel mein loha ke saath chromium aur nickel milaate hain, taaki jung na lage. Isliye bartan aur hospital ke auzaar isi ke bante hain.
- Aluminium halka hai aur ispar jung nahi lagti, isliye khidki ke frame aur cooker mein kaam aata hai; aluminium ke alloys hawai jahaz mein lagte hain.
- Concrete = cement + ret + rodi (gitti) + paani ka mixture. Lakdi bhi kai padarthon ka kudrati mixture hai.
- Bijli ke taar tambe (element) ke, kyunki tamba bijli bahut achhe se chalata hai.
5️⃣ Sehat aur kheti
- Dawaiyan: chemists (rasayan vaigyanik) aise compounds khojte aur banate hain jo beemari se ladte hain. Vaccine banane mein bhi chemistry ki badi madad lagti hai.
- ORS: paani + namak + cheeni ka mixture. Teeno ke apne-apne kaam hain, isliye mixture hi chahiye.
- Khaad (fertiliser): jaise urea, ek compound jo paudhon ko nitrogen deta hai, aur fasal achhi hoti hai.
6️⃣ Gadgets aur naye materials
- Ek mobile phone mein 45 se zyada elements lagte hain: chip mein silicon, battery mein lithium, taaron mein tamba, kuch jodon mein thoda sona, aur screen mein kaanch.
- Graphene aerogel: carbon se bana ek bahut halka, chhedon se bhara (porous) naya material. Yeh tel ko sponge ki tarah soakh sakta hai, isliye samudra mein tel phailne (oil spill) ki safaai mein madad kar sakta hai.
Toh kahani ka jawab: tamba lota element, namak compound, aur cooker, peetal glass, nimbu paani mixture. Steel element nahi, ek alloy (mixture) hai!
🖼️ Diagrams: Picture se Samjho
🔐 Deep Concept: Ek Hi Element, Alag-Alag Roop
1. Khatarnak + khatarnak = khaane layak! Sodium ek chamakdaar metal hai jo paani ko chhoote hi tez reaction karta hai. Chlorine ek zehreeli, peeli-hari gas hai. Par jab dono chemically judte hain, toh namak (sodium chloride) banta hai, jo hum roz thodi matra mein khaate hain. Kyun? Compound ke gun uske elements se bilkul alag hote hain.
2. Oxygen ke do roop. Hawa mein oxygen ek element (O₂ gas) ke roop mein hai, jisse hum saans lete hain. Paani mein bhi oxygen hai, par woh hydrogen se judi hai, isliye machhli ko gill se paani mein ghuli hui oxygen gas leni padti hai, paani ke andar wali judi oxygen nahi.
3. Loha ke do roop. Railing mein loha (steel ke roop mein) mazboot aur chamakdaar hai. Wahi loha hawa aur nami se jud kar jung (rust) ban jaata hai, jo ek compound hai: bhoora, bhurbhura aur kamzor. Isi liye railing par paint karte hain ya stainless steel use karte hain.
4. “Shuddh” sona aur carat ka hisaab. 24 carat sona lagbhag shuddh (element) hai, par bahut naram hota hai, gehne mud jaate. Isliye usme thoda tamba ya chaandi milate hain.
18 carat = 18 ÷ 24 = 75% sona.
Toh 22 carat ka gehna ek mixture (alloy) hai, element nahi!
5. Dawai ki goli. Goli mein asli dawai (ek compound) bahut thodi hoti hai; baaki mein aise padarth milaye jaate hain jo goli ko aakaar dete hain aur todne-nigalne mein aasaan banate hain. Toh goli ek mixture hai, jiske andar dawai ek compound hai.
✏️ Examples: Roz ki Cheez, Asli Pehchaan
| Cheez | Kya hai? | Kyun? |
|---|---|---|
| Tambe ka lota / bijli ka taar | Element | Lagbhag sirf copper (Cu) atom |
| Aluminium foil | Element | Lagbhag sirf aluminium (Al) |
| Namak | Compound | Sodium + chlorine, fixed anupaat (NaCl) |
| Cheeni | Compound | Carbon, hydrogen, oxygen ka fixed jod; garam karne par kaala carbon bachta hai |
| Baking soda | Compound | Sodium hydrogen carbonate, ek tay formula |
| Urea (khaad) | Compound | Carbon, hydrogen, nitrogen, oxygen ka fixed jod |
| Hawa | Mixture | Kai gas bina jod ke; anupaat jagah-jagah thoda badalta hai (jaise nami) |
| Steel / stainless steel | Mixture (alloy) | Loha + carbon / chromium / nickel, anupaat badal sakta hai |
| Peetal (brass), kansa (bronze) | Mixture (alloy) | Tamba + zinc / tamba + tin |
| Concrete | Mixture | Cement, ret, rodi, paani; mistri anupaat apne hisaab se rakhta hai |
| LPG | Mixture | Mainly propane aur butane gas |
| ORS | Mixture | Paani + namak + cheeni, sab apne gun rakhte hain |
⚖️ Difference Table: Roz ki Zindagi mein Teeno
| Baat | Element | Compound | Mixture |
|---|---|---|---|
| Ghar ke udaharan | Tamba lota, aluminium foil | Namak, cheeni, paani | Chai, steel, hawa, concrete |
| Hum kyun chunte hain | Us ek element ka khaas gun (tamba: bijli chalana) | Compound ka naya gun (namak: swaad) | Kai gun ek saath (steel: mazboot + jung kam) |
| Anupaat badal sakte hain? | Sawaal hi nahi, ek hi tarah ke atom | Nahi, fixed | Haan, zaroorat ke hisaab se |
| Pehchaan | Symbol: Cu, Al, O | Formula: NaCl, H₂O | Koi ek formula nahi |
| Roz kitna milta hai? | Sabse kam (shuddh roop mein) | Beech mein | Sabse zyada |
🚫 Misconceptions: Log aisa sochte hain… lekin
✅ Steel ek alloy hai: loha + carbon (aur stainless steel mein chromium, nickel bhi). Yeh mixture hai.
✅ 22 carat mein lagbhag 91.7% hi sona hai, baaki tamba ya chaandi. Yeh alloy (mixture) hai.
✅ Compound ke gun naye hote hain. Namak thodi matra mein khaane layak hai.
✅ Hawa mein sabse zyada nitrogen (lagbhag 78%) hai; oxygen lagbhag 21%.
✅ Woh oxygen hydrogen se judi hai. Machhli paani mein ghuli hui oxygen gas leti hai.
✅ Rozmarra mein ‘pure’ ka matlab hai milawat nahi. Science mein pure ka matlab ek hi tarah ke kan. Shuddh doodh bhi science mein mixture hai.
🔤 Key Terms (Exam mein English shabd hi likhna)
❓ FAQs
Roz ki zindagi mein sabse zyada mixtures hi kyun milte hain?
Kyunki aksar humein ek se zyada gun ek saath chahiye. Mixture mein har hissa apna gun rakhta hai, aur anupaat badal kar hum gun “set” kar sakte hain, jaise steel mein carbon thoda badha kar use zyada sakht banana.
Kya aluminium foil sach mein element hai?
Haan, lagbhag. Foil zyadatar aluminium ka hi hota hai (kabhi bahut thodi matra mein doosre metal bhi), isliye school level par use element maana jaata hai.
Tambe ka lota kuch din mein kaala ya hara kyun pad jaata hai?
Tamba hawa ki oxygen, carbon dioxide aur nami se dheere-dheere react karke upar ek patli compound ki parat bana leta hai. Nimbu aur namak se ragadne par yeh parat hat jaati hai.
Doodh ko log “pure” kehte hain, phir bhi mixture kyun?
Doodh mein paani, fat, protein, cheeni (lactose) aur minerals sab mile hain. Milawat na ho toh woh “shuddh doodh” hai, par science ki nazar mein mixture hi hai.
Mobile phone mein itne saare elements kyun lagte hain?
Har hisse ko alag gun chahiye: chip ke liye silicon, battery ke liye lithium, taaron ke liye tamba, aur jodon par jung na lage isliye kahin-kahin thoda sona. Isliye purane phone recycle karna zaroori hai, taaki yeh keemti elements wapas mil sakein.
🧪 Activity: Ghar ki Cheezon ka Sorting Challenge
NCERT book ke is hisse mein (elements, compounds aur mixtures ka upyog) koi alag numbered activity nahi hai. Par chapter baar-baar kehta hai ki aas-paas ki cheezon ko pehchaano aur unhe sahi dabbe mein rakho. Isliye hum wahi soch ek ghar ki activity bana kar, apne shabdon mein, step-by-step karenge.
Saamaan: ek notebook, pen, teen kaagaz ki parchiyan (ELEMENT, COMPOUND, MIXTURE likh kar), aur ghar ki cheezein (sirf dekhni hain, chakhni ya kholni nahi).
👀 Aksar kya nateeja aata hai aur kyun? (Click karo)
| Dabba | Aam cheezein | Matlab |
|---|---|---|
| Element | Tambe ka bartan, aluminium foil | Sabse kam cheezein; shuddh element roz kam milte hain |
| Compound | Namak, cheeni, paani, baking soda | Fixed formula wale padarth |
| Mixture | Chai patti, doodh, sabun, steel chammach, peetal ghanti, mitti | Sabse zyada cheezein; roz ki zindagi mixtures se bhari hai |
Is activity se kya seekha? Hum cheezein unke gun ki wajah se chunte hain, aur zyadatar kaam ki cheezein mixtures hoti hain, kyunki unme kai gun ek saath milte hain.
Yeh activity NCERT ki Class 8 Science book Curiosity (Chapter 8) par aadharit hai, aur yahan apne shabdon mein samjhayi gayi hai.
🏠 Mini Experiments (Ghar pe)
Result: keel chipakti hai, aluminium aur tamba nahi. Mazedaar baat: kuch steel ke chammach chipakte hain, kuch nahi! Kyunki alag-alag stainless steel mein metals ka anupaat alag hota hai (jaise nickel kam ya zyada), aur mixture ke gun anupaat ke saath badal jaate hain.
Result: anupaat badla par padarth wahi raha, kyunki yeh mixture hai. Paani (compound) mein aisa nahi ho sakta: H aur O ka anupaat hamesha 2 : 1.
Result: jhaag aur bulbule! Ek nayi gas (carbon dioxide) bani, yaani chemical reaction hua. Baking soda ek compound hai jo nimbu ke acid se react karta hai. Isi gun ki wajah se ise dhokla aur cake fulaane mein use karte hain.
⚠️ Safety Notes
🧠 Think Like a Scientist
🌍 Real Life Mein Teen Dost
- Rasoi: LPG (mixture) jalti hai, cooker (stainless steel alloy) mein daal pakti hai, namak (compound) swaad deta hai.
- Ghar banana: saria (steel ki chhad) aur concrete (dono mixture) se chhat, tambe (element) ke taar se bijli.
- Hospital: dawaiyan (compounds se bani), ORS (mixture), stainless steel ke auzaar, oxygen cylinder (element).
- Khet: urea jaisi khaad (compound) se fasal badhti hai.
- Mandir aur ghar ki parampara: peetal ki ghanti aur kansa (bronze) ki thali, dono alloys, sadiyon se use ho rahe hain.
- Paryavaran: graphene aerogel jaise naye materials tel ke phailaav ki safaai mein madad kar sakte hain.
🔁 Recap: Poora Post Ek Nazar Mein
- Hum padarth unke gun dekh kar chunte hain; zyadatar kaam ki cheezein mixtures hain.
- Hawa mixture hai (lagbhag 78% nitrogen, 21% oxygen, 1% baaki); paani compound hai (H₂O).
- Rasoi: tamba, aluminium = elements; namak, cheeni, baking soda = compounds; chai, doodh, LPG, steel = mixtures.
- Loha zyadatar steel (alloy) ke roop mein; stainless steel = loha + chromium + nickel; peetal = tamba + zinc; kansa = tamba + tin.
- Concrete aur lakdi mixtures hain; bijli ke taar tambe ke.
- Dawai, vaccine aur khaad (urea) mein chemistry ka bada haath; mobile mein 45 se zyada elements.
- 22 carat sona ≈ 91.7% sona, yaani alloy; compound ke gun elements se alag (namak safe, sodium-chlorine khatarnak).
✍️ Fill in the Blanks
1. Hawa mein sabse zyada matra mein ______ gas hoti hai.
nitrogen (lagbhag 78%)
2. Stainless steel mein loha ke saath ______ aur nickel milaye jaate hain.
chromium
3. Peetal (brass) tamba aur ______ ka alloy hai.
zinc
4. Concrete cement, ret, rodi aur ______ ka mixture hai.
paani
5. Bijli ke taar zyadatar ______ element ke bante hain.
tamba (copper)
6. Ek mobile phone mein ______ se zyada elements lagte hain.
45
✅ True / False
1. Steel ka cooker ek element se bana hai.
False: steel ek alloy (mixture) hai; loha ke saath carbon aur stainless steel mein chromium, nickel bhi.
2. Namak khaane layak hai, jabki sodium aur chlorine alag-alag khatarnak hain.
True: compound ke gun uske elements se alag hote hain.
3. Hawa ek compound hai kyunki woh poori jagah ek jaisi dikhti hai.
False: hawa homogeneous mixture hai; gas bina jod ke mili hain.
4. 22 carat sone mein lagbhag 91.7% sona hota hai.
True: 22 ÷ 24 × 100 ≈ 91.7%.
5. Urea ek compound hai jo khaad ke roop mein use hota hai.
True: urea carbon, hydrogen, nitrogen, oxygen ka fixed jod hai aur paudhon ko nitrogen deta hai.
6. Machhli paani ke molecule (H₂O) mein judi oxygen se saans leti hai.
False: machhli paani mein ghuli hui oxygen gas leti hai; H₂O ki oxygen hydrogen se judi hai.
🔘 MCQs
Q1. Rasoi ki inme se kaun si cheez element hai? (a) Namak (b) Aluminium foil (c) Chai (d) Baking soda
✅ (b) Aluminium foil: lagbhag sirf aluminium atom.
(a) namak compound hai (NaCl).
(c) chai mixture hai.
(d) baking soda compound hai (sodium hydrogen carbonate).
Q2. Stainless steel kya hai? (a) Element (b) Compound (c) Mixture (alloy) (d) Gas
✅ (c) Mixture (alloy): loha, chromium, nickel bina fixed anupaat ke mile hain.
(a) element nahi, kyunki kai metals hain.
(b) compound nahi, kyunki koi fixed formula nahi.
(d) woh thos hai, gas nahi.
Q3. Concrete kisse banta hai? (a) Sirf cement se (b) Cement, ret, rodi aur paani se (c) Ek hi compound se (d) Ek hi element se
✅ (b): yeh kai padarthon ka mixture hai.
(a) sirf cement se concrete nahi banta.
(c) aur (d) galat, concrete pure substance nahi hai.
Q4. Inme se kaun sa compound sirf non-metals se bana hai? (a) Namak (NaCl) (b) Carbon dioxide (CO₂) (c) Peetal (d) Tamba
✅ (b) Carbon dioxide: carbon aur oxygen dono non-metals.
(a) namak mein sodium ek metal hai.
(c) peetal mixture hai, compound nahi.
(d) tamba element hai.
Q5. Hawa mein sabse zyada kaun si gas hai? (a) Oxygen (b) Carbon dioxide (c) Nitrogen (d) Argon
✅ (c) Nitrogen: lagbhag 78%.
(a) oxygen lagbhag 21%.
(b) CO₂ bahut thodi.
(d) argon lagbhag 1%.
Q6. 22 carat sone ka gehna kya hai? (a) Shuddh element (b) Compound (c) Mixture (alloy) (d) Gas ka mixture
✅ (c) Mixture (alloy): sone ke saath tamba ya chaandi mila hai.
(a) shuddh hone ke liye 24 carat (lagbhag 100%) chahiye.
(b) sona aur tamba chemically jude nahi hain.
(d) gehna thos hai.
Q7. Ek mobile phone mein lagbhag kitne elements lagte hain? (a) 2–3 (b) 10 se kam (c) 45 se zyada (d) Sirf silicon
✅ (c) 45 se zyada.
(a) aur (b) bahut kam hain; har hisse ko alag gun wala element chahiye.
(d) silicon sirf chip mein hai; battery, taar, screen mein alag elements.
Q8. Baking soda par nimbu ras daalne se bulbule kyun bante hain? (a) Physical badlaav hai (b) Chemical reaction se nayi gas (CO₂) bani (c) Mixture ke hisse alag hue (d) Paani ubal gaya
✅ (b): naya padarth (carbon dioxide) bana.
(a) physical badlaav mein naya padarth nahi banta.
(c) koi hissa alag nahi hua, naya bana.
(d) koi garmi nahi di, paani nahi ubla.
🔗 Assertion–Reason
Options: (a) A aur R dono sahi, aur R, A ko samjhata hai · (b) A aur R dono sahi, par R, A ko nahi samjhata · (c) A sahi, R galat · (d) A galat, R sahi
1. A: Bartan aksar stainless steel ke banate hain, sirf lohe ke nahi. R: Chromium milane se steel par jung bahut kam lagti hai.
✅ (a): jung se bachaav hi stainless steel chunne ki wajah hai. R seedha A ko samjhata hai.
2. A: Hawa ek mixture hai. R: Hawa mein nitrogen sabse zyada hai.
✅ (b): dono sahi, par nitrogen zyada hone se hawa mixture nahi banti. Mixture isliye hai ki gas bina jod ke, badalne wale anupaat mein mili hain.
3. A: Dawai ki goli ek compound hai. R: Goli mein dawai ke saath aur padarth bhi milaye jaate hain.
✅ (d): A galat, goli mixture hai. R sahi hai, aur yahi batata hai ki goli compound kyun nahi.
📝 Very Short Answer (1 mark)
1. Rasoi ki do aisi cheezein batao jo element hain.
Tambe ka lota, aluminium foil.
2. Kansa (bronze) kin do metals ka alloy hai?
Tamba aur tin.
3. Baking soda ka chemical naam likho.
Sodium hydrogen carbonate.
4. LPG mixture hai ya compound?
Mixture (mainly propane aur butane).
5. Graphene aerogel kis element se bana hai?
Carbon.
🧾 Short Answer (2–3 marks)
1. Bijli ke taar tambe ke aur khidki ke frame aluminium ke kyun bante hain?
Tamba bijli bahut achhe se chalata hai aur aasani se taar mein khinch jaata hai. Aluminium halka hai, mazboot hai aur ispar jung nahi lagti, isliye frame ke liye theek hai. Dono ko unke gun ki wajah se chuna gaya.
2. Hawa ko mixture aur paani ko compound kyun kehte hain?
Hawa mein nitrogen, oxygen, argon, CO₂ jaisi gas bina jod ke mili hain aur har gas apne gun rakhti hai; anupaat bhi thoda badalta hai. Paani mein hydrogen aur oxygen hamesha 2 : 1 mein chemically jude hain, aur paani ke gun (aag bujhana) dono gas se alag hain.
3. Shuddh sone se gehne kyun nahi banate? Carat ka matlab bhi batao.
24 carat (lagbhag shuddh) sona bahut naram hota hai, gehne mud ya ghis jaate. Isliye tamba/chaandi milate hain. Carat batata hai ki 24 hisson mein se kitne hisse sona hain: 22 carat ≈ 91.7%, 18 carat = 75%.
4. Kheti aur sehat mein compounds ki do-do upyogita likho.
Kheti: urea jaisi khaad paudhon ko nitrogen deti hai; kuch compounds keedon se fasal bachate hain. Sehat: dawaiyan compounds se banti hain; vaccine banane mein bhi chemistry ka bada role hai. (ORS bhi madad karta hai, par woh mixture hai.)
📜 Long Answer (5 marks)
1. Ghar banane mein lagne wale padarthon ko element, compound aur mixture mein baanto, aur har ek ko chunne ka kaaran likho.
Mixtures: concrete (cement + ret + rodi + paani; sukh kar patthar jaisa sakht), steel ki saria (loha + carbon; mazboot aur thodi lachkeeli), lakdi (kudrati mixture; darwaze-khidki), stainless steel ki railing (jung kam), paint.
Elements: tambe ke bijli ke taar (bijli achhi chalti hai), aluminium ke frame (halka, jung nahi).
Compounds: paani (concrete banane aur pakka karne mein).
Nishkarsh: ghar mein sabse zyada mixtures lagte hain, kyunki unme kai gun ek saath milte hain aur anupaat zaroorat ke hisaab se rakha ja sakta hai.
2. “Compound ke gun uske elements se alag hote hain.” Roz ki zindagi ke do udaharan se samjhao, aur yeh bhi batao ki ek hi element alag roop mein kaise milta hai.
Udaharan 1, namak: sodium (paani mein tez reaction karne wala metal) + chlorine (zehreeli gas) = sodium chloride, jo thodi matra mein khaane layak hai.
Udaharan 2, paani: hydrogen jalne wali gas, oxygen jalne mein madad karti hai, par paani aag bujhata hai.
Ek element, alag roop: oxygen hawa mein element (O₂) ke roop mein saans ke liye, aur paani mein compound ke andar judi hui. Isi tarah loha railing mein (steel ke roop mein) mazboot, par jung (compound) ban kar bhurbhura ho jaata hai.
Nishkarsh: jab elements chemically judte hain, toh bilkul naya padarth banta hai, isliye kisi compound ke gun uske elements ke naam se andaza nahi lagaye ja sakte.
📰 Case-Based Question
Priya ke chacha naya ghar bana rahe the. Site par cement ki boriyan, ret ka dher, rodi, paani ki tanki, steel ki saria, aluminium ki khidkiyaan aur tambe ke taaron ke bandal pade the. Mistri ne bataya ki chhat ke liye “1 hissa cement, 2 hisse ret, 4 hisse rodi” ka masala banega, aur deewar ke plaster ke liye alag anupaat. Priya ne socha: “Anupaat badal sakte hain? Toh yeh masala mixture hi hoga!”
Q1. Mistri ka masala (concrete) mixture hai ya compound? Priya ki soch sahi kyun hai?
Mixture. Anupaat kaam ke hisaab se badla ja raha hai, aur compound mein anupaat hamesha fixed hota hai.
Q2. Saria loha ki hai, toh kya woh ek element hai?
Nahi. Saria steel ki hai, jo loha + thoda carbon ka alloy (mixture) hai; yeh shuddh lohe se zyada mazboot hoti hai.
Q3. Site par pade padarthon mein se ek element aur ek compound batao.
Element: tambe ke taar (ya aluminium). Compound: paani.
Q4. Khidkiyon ke liye aluminium kyun chuna gaya?
Aluminium halka hai, mazboot hai aur ispar jung nahi lagti, isliye baarish aur dhoop mein bhi khidki lambe samay tak theek rehti hai.
🚀 HOTS (Socho, Phir Jawab Do)
1. Agar duniya mein koi mixture banana mana ho jaaye (sirf shuddh elements aur compounds use kar sakein), toh roz ki zindagi mein kya-kya mushkil hogi?
Steel, stainless steel, peetal jaise alloys nahi bante, toh pul, gaadiyaan aur bartan kamzor ya jung wale hote. Concrete nahi, toh pakki imaaratein mushkil. Chai, ORS, dawai ki goli, sabun bhi nahi. Mixtures se hi hum kai gun ek saath pa sakte hain.
2. ORS mein namak aur cheeni ko compound bana kar dena behtar hoga ya mixture rakhna? Kyun?
Mixture rakhna behtar hai. Mixture mein namak aur cheeni dono apne gun rakhte hain, jinki shareer ko zaroorat hai. Agar woh jud kar naya compound ban jaate, toh uske gun alag hote aur woh shareer ke kaam ka na hota. Saath hi mixture mein anupaat zaroorat ke hisaab se rakha ja sakta hai.
3. Graphene aerogel bahut halka aur chhedon se bhara hai. Yeh dono gun tel ki safaai mein kaise madad karte hain?
Halka hone se yeh paani par tair sakta hai aur aasani se uthaya ja sakta hai. Chhedon (pores) ki wajah se iske andar bahut jagah hoti hai, jisme tel sponge ki tarah bhar jaata hai. Phir ise nikaal kar tel alag kiya ja sakta hai.
🏆 Olympiad Corner
1. Ek 22 carat sone ki chain ka wazan 10 g hai. Usme lagbhag kitna shuddh sona hai?
Sona = 10 × 22 ÷ 24 = 9.17 g (lagbhag). Baaki lagbhag 0.83 g tamba ya chaandi.
2. Ek stainless steel ke patile ka wazan 500 g hai aur usme 18% chromium hai. Chromium kitna hai?
Chromium = 500 × 18 ÷ 100 = 90 g.
3. Ek kamre mein 5 litre hawa li gayi. Usme lagbhag kitni oxygen hogi? Aur kya yeh oxygen hawa se “physical” tareeke se alag ho sakti hai?
Oxygen ≈ 5 × 21 ÷ 100 = 1.05 litre. Haan, kyunki hawa mixture hai; factory mein hawa ko bahut thanda karke tarl (liquid) banaya jaata hai aur alag-alag gas alag kar li jaati hain. Yahi oxygen hospital ke cylinder mein jaati hai.
📚 Aur Padho (External Reference)
- NCERT Class 8 Science Curiosity, Chapter 8 (official PDF): elements, compounds aur mixtures ke upyog wala hissa dekho
- DIKSHA: Sarkar ka free learning platform, NCERT ke videos ke liye
💖 CharuMam Motivation
Aaj aapne dekha ki sabse kaam ki cheezein aksar mixtures hoti hain: steel mein loha akela nahi, chromium aur nickel uska saath dete hain, tab jaakar woh jung se bachta hai.
Zindagi bhi aisi hi hai, beta. Akele mein aap achhe ho, par jab aap dosto, parivaar aur teachers ke saath milte ho, sabke gun mil kar aapko aur mazboot banate hain. Aur haan, apni pehchaan mat khona: mixture mein har hissa apna gun rakhta hai! Aaj ghar ki ek cheez uthao aur socho, “yeh kis dabbe ki hai?” Bas! 🌱
— CharuMam
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