16. Read the examples of chemical compounds and reactions

NaCl	N A C L Sodium chlorine Sodium chloride
Fe4N	F E four N Iron four nitrogen Iron nitride
Al2O3	A L two O three Aluminum two oxygen three Aluminum oxide
Fe2(SO4)3	Iron two sulfur oxygen four Ferric sulfate or Iron (III) sulfate
2H2+O2 → 2H2O	Two molecules of H two plus one molecule of O two yields two molecules of H two O. Two molecules of hydrogen plus oxygen yields two molecules of water.
Cu+2H2SO4 → CuSO4+2H2O+SO2	One molecule of copper plus two molecules of sulfuric acid forms one molecule of copper sulfate plus two molecules of water plus one molecule of sulfur oxide.
Pb(OH)2 → PbO+H2O	Heating of lead hydroxide leads to the formation of lead oxide and water.
ZnCO3+2HNO3 → Zn(NO3)2+CO2+H2O	The reaction between zinc carbonate and two molecules of nitric acid results in the formation of zinc nitrite, carbon dioxide and water.

Read the following chemical compounds and reactions using the examples above

1. AlF₆Li₃

2. AuCN

3. Ba(CHO₂)₂

4. Bi₂S₃

5. CH₃COCH₃

6. Ca(NO₂)₂

7. Co(NO₃)₃

8. FeCl₃

9. H₂SiO₃

10. Li₂TiO₃

11. C+O₂ → CO₂

12. 2Mg+CO₂ → 2MgO+C

13. Ca(OH)₂+CO₂ → CaCO₃+H₂O

14. KOH+CO₂ → KHCO₃

15. 2NH₃+H₂SO₄ → (NH₄)₂SO₄

16. Zn+2N₂O₄ → Zn(NO₃)₂+2NO

17. Pb(NO₃)₂ + 2 KI → PbI₂ + 2 KNO₃

18. C₁₀H₈ + 12 O₂ → 10 CO₂ + 4 H₂O

19. SnO₂ + H₂ → Sn + H₂O

20. Fe₂O₃+3H₂SO₄ → Fe2(SO₄)₃+3H₂O

17. Read the following text and retell it in Russian

The reaction of two or more elements together results in the formation of a chemical bond between atoms and the formation of a chemical compound.

Oxidation, reduction, dissociation, acid-base neutralization and molecular rearrangement are some of the commonly used kinds of chemical reactions.

A combustion reaction is when oxygen combines with another compound to form water and carbon dioxide. An example of this kind of reaction is the burning of napthalene:

C₁₀H₈ + 12O₂ → 10CO₂ + 4H₂O

A synthesis reaction is when two or more simple compounds combine to form a more complicated one. One example of a synthesis reaction is the combination of iron and sulfur to form iron (II) sulfide:

8Fe + S₈ → 8FeS

A decomposition reaction is the opposite of a synthesis reaction - a complex molecule breaks down to make simpler ones. One example of a decomposition reaction is the electrolysis of water to make oxygen and hydrogen gas:

2H₂O → 2H₂ + O₂

Single displacement: This is when one element trades places with another element in a compound. One example of a single displacement reaction is when magnesium replaces hydrogen in water to make magnesium hydroxide and hydrogen gas:

Mg + 2H₂O → Mg(OH)₂ + H₂

Double displacement: This is when the anions and cations of two different molecules switch places, forming two entirely different compounds. One example of a double displacement reaction is the reaction of lead (II) nitrate with potassium iodide to form lead (II) iodide and potassium nitrate:

Pb(NO₃)₂ + 2KI → PbI₂ + 2KNO₃

Acid-base: This is a special kind of double displacement reaction that takes place when an acid and base react with each other. The H+ ion in the acid reacts with the OH- ion in the base, causing the formation of water. One example of an acid-base reaction is the reaction of hydrobromic acid (HBr) with sodium hydroxide:

HBr + NaOH → NaBr + H₂O

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