Toshkent viloyati quyi chirchiq tumani maktabining 7 – “ ” sinf o`quvchisi

3- Nazorat ishi.
Mavzu:

Molekula. Nisbiy molekulyar massa

Oddiy va murakkab moddalar

Modda miqdori. Avogadro doimiysi. Moddaning molyar м

Kimyoviy reaksiyalarning tenglamalarini tuzish

Nazorat shakli: masalalar yechish.
1-masala: 87,75g osh tuzini hosil qilish uchun qancha massa natriy metali kerak.
2-masala: tarkibida 63,22 % Mn va 36,78 % O bo’lgan moddaning formulasini aniqlang.
3-masala: 10g H2 ning normal sharoyitdagi hajmini va undagi molekulalar sonini toping.
4-masala: 41g natriy fosfatning modda miqdorini hisoblang.
5-masala: Quyidagi reaksiyalarni tugallang va koeffitsiyentlarni qo’ying.
Al + Cl2 → P + O2 →
N2 + H2→ Ag+Br→
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Sana Ball Imzo