Question

Oxides are complex substances, consisting of two elements, one of which is ____ (oxygen / hydrogen).
2) Differentiate the oxides FeO, NO, Cu₂O, ZnO, N₂O₅ BeO, CO, SO₂ into 4 groups:
Basic
Acidic
Amphoteric
Neutral




Remember amphoteric oxides: Al₂O₃, Cr₂O₃, ZnO, SnO, PbO, BeO
Remember neutral oxides: NO, N₂O, CO.
3) Complete and balance the reactions of oxides:
a) CaO +H₂O→Ca(OH)₂ B) P₂O₅ + H₂O→…….. C) CO₂ + KOH→………. D) SO₃ + MgO→…….. e) Na₂O + H₂O→…..
4) Complete the decomposition reaction in which oxides are formed:
a) H₂CO₃→CO₂↑ + H₂O b) H₂SO₃→………… c) H₂SiO₃→………… d) Cu(OH)₂→………… e) MgCO₃→…………
5) Problem. Calculate the volume of oxygen gas (L, STP) that reacts with calcium and 14g of calcium oxide is formed.
6) Write the formulas of corresponding acids
a) SO₃→H₂SO₄ b) P₂O₅→……. c) SiO₂→……. D) B₂O₃→…….
7) Complete the transformations:
a) H₂O→O₂→ SO₂→ H₂SO₃
b) H₂O₂→O₂→ K₂O→ KOH
8) Problem. 7,1g of P₂O₅ reacts with water to form Phosphoric acid. Calculate the mass of Phosphoric acid formed.
9) Acids. Differentiate the acids into 3 groups: HCl, H₂SO₄, H₃PO₄, H₃BO₃, H₂CO₃,HBr,
Monoprotic ( одноосновные)
Diprotic (двухосновные)
Triprotic (трехосновные)



10) Write dissociation reactions (распад на ионы) Поставить заряды!!!
a) H₂SO₃↔ 2H⁺ + SO₃²¯ b) HNO₃↔……… c) H₃PO₄,↔…….. d) H₃BO₃↔………
11) Changing colour of indicators:

litmus
Methyl orange
Phenol phthalein
Acids
?
?
colourless
12) Choose the neutralization reaction:
a) Zn + H₂SO₄ → ZnSO₄ + H₂ b) S + O₂→SO₂ c) SO₃ + H₂O→ H₂SO₄ d) Ca(OH)₂ + H₂SO₄ → CaSO₄ +H₂
13) Choose strong acids: : HCl, H₂SO₄, H₃PO₄, H₂SiO₃, H₂CO₃,HBr, CH₃COOH, HNO₃, H₂SO₃, HNO₂ .
14) Choose diprotic acids ( двухосновные) : HCl, H₂SO₄, H₃PO₄, H₂SiO₃, H₂CO₃,HBr, CH₃COOH, HNO₃, H₂SO₃, HNO₂ .
15) Complete the sentence: Acids are complex substances, consisting of hydrogen atoms and _____ ______.
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Answer 1

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