☰ Contents · Chemistry

Review of Grade 7: atoms, moles and classes of compounds

Lessons 1–2 · 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
Calculate the molar mass of Ca(OH)₂.
2
What is the mass of 3 mol of SO₂? (M = 64 g/mol)
3
Write the formula of phosphorus(V) oxide by valency.
4
Write the equations for the series Na → Na₂O → NaOH → Na₂SO₄.
5
Why are CO and NO called “neutral” oxides?