☰ Contents · Chemistry

Mineral fertilizers

Lessons 46–47 · 2 lessons · I.R. Asqarov, K. G‘opirov, N.X. To‘xtaboyev. Chemistry Grade 8, revised 4th edition. “Yangiyul Poligraph Service”, Tashkent, 2019
Answers are for parents and teachers.
1
How many kg of HNO₃ are needed to make 800 kg NH₄NO₃ (63 : 80)?
2
The mass of P₂O₅ in 468 kg Ca(H₂PO₄)₂ (234 → 142)?
3
How many kg of N are in a 40 kg bag labelled “20-10-10”?
4
Why is it wrong to apply ammonium sulfate mixed with lime?
5
Write three rules for storing mineral fertilizers safely at home.