Kimyo fanidan

Sana__________
6-Nazorat ishi.
Mavzu: Suv–eng yaxshi erituvchi. Eruvchanlik. Eritmalar va ularning konsentratsiyalari. Metallar va metallmaslar. Oksidlar. Asoslar.
Nazorat shakli:Masala yechish
I-variant.
1.300gr 10%li eritmadagi erituvchi va eruvchi moddalarning massalarini toping.
2.500ml 0,2m eritma tayorlash uchun necha gr natriy karbonat Na₂CO₃kerak?
3.50gr natriy xlorid NaCl tuziga 150gr suv qo’shildi. Hosil bo’lgan eritmaning massa ulushini (%)da hisoblang.
Kompetentlikni aniqlash uchun materiallar:
4.Qanday eritmalar tayyorlay olasiz?
5.Hayotingizda ko’rgan metallaringizni sanab bering?
II-variant
1.200gr 10%li osh tuzinig eritmasiga 100gr suv qo’shildi.Hosil bo’lgan eritmaning (%)konsentratsiyasini hisoblang.
2.4l o’yuvchi natriy NaOH eritmasida 80gr NaOH bor.Shu eritmaning molyar konsentratsiyasini toping.
3.Tuzning 25⁰c da to’yingan 220gr eritmasida 20gr tuz bo’lsa,shu tuzning eruvchanlik koeffitsiyentini aniqlang.
Kompetentlikni aniqlash uchun materiallar:
4.Ayollarimiz ishlatadigan tilla buyumlar eritmaning qanday turiga misol bo’la oladi?
5.Suv havzalarini tozaligini saqlash uchun qanday takliflar bera olasiz?
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Baho__________