Andijon viloyati Baliqchi tumani 35-umumta’lim maktabining 9-“ ”sinf o‘quvchisi

Sana_____________

3-nazorat ishi

Mavzu: Metallarni davriy sistemada o’mi, tabiatda tarqalishi, ishlatilishi. Elektrokimyoviy kuchlanish qatori. Qotishmalar

Nazorat shakli: masalalar yechish.

1. Tarkibida 16 gr mis(II) sulfat bo’lgan eritmaga 4.8 gr temir qipig’i solindi. Bunda qancha mis ajralib chiqdi.

2.0,5 mol natriy peroksididagi kislorod atomlari sonini toping.

3. 120 gr mis va ruxdan iborat qotishmaning 60% ini mis tashkil etadi. Cu₃Zn₅ tarkibli qotishmani tayyorlash uchun necha gr rux qo’shish kerak?

4. CaH₂ ning necha grammi suvda eritilsa 5.61 (n.sh)da vodorod hosil bo’ladi?

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Ball_____________________ O’qituvchining imzosi