Soluble aur insoluble substances
Short mein jawab
Koi padaarth paani mein soluble hai agar milaakar hilaane par poori tarah gaayab ho jaaye, jaise cheeni aur namak; wo ghul jaata hai. Padaarth insoluble hai agar der tak hilaane par bhi gaayab na ho, jaise ret, chalk powder aur buraada. Kuch liquids, jaise sirka aur shahad, paani mein mil jaate hain, jabki tel alag parat banaata hai.
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Gaayab hoti cheeni
Ghulan khelkar thaka aur pyaasa ghar aaya, to uski maa ne use shikanji banaakar di: ek gilaas paani mein ek chammach cheeni, chutki bhar namak aur thoda neembu ka ras. Hilaate hi cheeni aur namak gaayab ho gaye. Wo kahan gaye?
Paani mein materials ki jaanch
Chapter ki activity mein paanch gilaas do-tihaai paani se bhare jaate hain, aur har ek mein ek chammach cheeni, namak, chalk powder, ret aur buraada daalkar hilaaya jaata hai. Kuch minute baad:
| Material | Kya hota hai |
|---|---|
| Cheeni | Gaayab: soluble |
| Namak | Gaayab: soluble |
| Chalk powder | Paani doodhiya, phir neeche baith jaata hai: insoluble |
| Ret | Tale mein baith jaati hai: insoluble |
| Buraada | Upar tairta hai: insoluble |
Jo materials paani mein poori tarah gaayab ho jaayein, wo ghulte hain, yaani paani mein soluble hain. Jo materials paani mein nahi milte aur der tak hilaane par bhi gaayab nahi hote, wo insoluble hain. Ghuli cheeni khatm nahi hoti: wo poore paani mein phail jaati hai, isiliye shikanji meethi lagti hai.
Paani mein liquids aur gases
- Liquids: kuch paani mein poori tarah mil jaate hain, jaise sirka aur shahad. Doosre, jaise tel, nahi milte aur chhod dene par alag parat banaate hain.
- Gases: kuch paani mein ghulti hain aur kuch nahi. Oxygen paani mein ghulti hai, aur machhliyan aur paani ke paudhe zinda rehne ke liye us par nirbhar hain.
Ye kyun maayne rakhta hai
Paani bahut saare materials ghol leta hai, isiliye hamare sharir mein iski itni zaroori bhoomika hai. ORS bhi isi tarah kaam karta hai: Oral Rehydration Solution dast ya doosri bimaariyon se hui paani ki kami (dehydration) mein diya jaata hai. Bana-banaaya packet ek litre paani mein ghola jaata hai; ghar par ORS ek litre ubaale aur thande paani mein chhah chammach cheeni aur aadha chammach namak milaakar ban sakta hai. Ghuli cheeni aur namak sharir ko khoya hua paani aur namak waapas lene mein madad karte hain, isliye ORS ko peene se pehle saaf paani mein poori tarah gholna chahiye.
Roz ki zindagi mein ghol
Roz ki kai cheezein ghulne par nirbhar hain. Chai aur coffee meethi lagti hai kyunki cheeni unme ghul jaati hai, pakaate samay namak daal aur sabzi mein ghul jaata hai, aur neembu paani mein chutki bhar namak aur cheeni se shikanji banti hai. Kapde dhone ke liye detergent powder paani mein mil jaata hai. Insoluble materials ka bhi kaam hai: ret aur kankad nahi ghulte, isliye taalaab ke tale mein baith jaate hain, aur buraada tairta hai, isliye upar se nikaala ja sakta hai.
Jaldi kaise ghulaayein (Extra)
Cheeni jaldi ghulti hai agar hilaao, paani garam ho, aur cheeni bade dhele ki jagah baareek daanon mein ho. Ek gilaas mein cheeni ka cube aur doosre mein utni hi pisi cheeni daalkar dekho ki pehle kaun gaayab hota hai.
Yaad rakhne waale jode
Sirka, shahad, sarson ka tel, paani, glucose aur aate mein se:
- Soluble jode: paani mein shahad, paani mein glucose, aur paani mein sirka.
- Insoluble jode: sarson ka tel aur paani, aur aata aur paani.
Materials ki doosri properties ke liye padho materials ki properties. Textbook ke sawaalon ke liye dekho Chapter 6 ke NCERT solutions; poore chapter ke liye Chapter 6 ke notes.
Practice karo
-
Inme se paani mein soluble kya hai?
Jawab dekho
Jawab: (c) Cheeni
-
Paani mein sarson ka tel daalkar chhod do, to wo:
Jawab dekho
Jawab: (b) alag parat banaata hai
-
Paani mein ghuli kaunsi gas machhliyon aur paani ke paudhon ko zinda rakhti hai?
Jawab dekho
Jawab: (a) Oxygen
-
Sirka, shahad, sarson ka tel, paani, glucose aur aate se do jode banao jahan ek doosre mein soluble ho.
Jawab dekho
Jawab: Paani mein shahad, aur paani mein glucose. (Sirka bhi paani mein poori tarah mil jaata hai.)
-
Do jode banao jahan ek doosre mein insoluble rahe.
Jawab dekho
Jawab: Sarson ka tel aur paani, jo do parat banaate hain, aur aata aur paani, jahan aata nahi ghulta aur neeche baith jaata hai.
Students ke sawal
Soluble substances kya hote hain?
Wo padaarth jo paani mein milaakar hilaane par poori tarah gaayab ho jaate hain, jaise cheeni aur namak. Hum kehte hain ki wo paani mein ghul gaye.
Insoluble substances kya hote hain?
Wo padaarth jo der tak hilaane par bhi paani mein gaayab nahi hote, jaise ret, chalk powder aur buraada. Wo neeche baith jaate hain, tairte hain ya alag tukdon mein rehte hain.
Ghar par ORS kaise banaate hain?
Ek litre ubaale aur thande paani mein chhah chammach cheeni aur aadha chammach namak milaao. ORS dast ya doosri bimaariyon se hui paani ki kami (dehydration) mein diya jaata hai; bane-banaaye packet bhi milte hain.
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