Question

Расставьте коэффициенты в уравнениях реакций: 1) NO + O2 → NO2; 2) PCl3 + Cl2 → PCl5; 3) Fe + H2O → Fe3O4 + H2; 4) CaCl2+Na2CO3 → CaCO3 + NaCl; 5) NaBr + Cl2 → NaCl + Br2; 6) Ca + HCl → CaCl2 + H2↑; 7) Mg + O2 → MgO; 8) H2S + O2 → H2O + SO2; 9) Fe2O3 + H2 → Fe + H2O

Answer 1

Решение:

1) 2NO + O2 = 2NO2;

2) PCl3 + Cl2 = PCl5;

3) 3Fe + 4H2O = Fe3O4 + 4H2;

4) CaCl2+Na2CO3 = CaCO3 + 2NaCl;

5) 2NaBr + Cl2 = 2NaCl + Br2;

6) Ca + 2HCl = CaCl2 + H2↑;

7) 2Mg + O2 = 2MgO;

8) 2H2S + 3O2 = 2H2O + 2SO2;

9) Fe2O3 + 3H2 = 2Fe + 3H2O

Answer 2

1) NO + O2 → NO2 In this reaction, nitrogen monoxide (NO) reacts with oxygen gas (O2) to form nitrogen dioxide (NO2).

The balanced equation for this reaction is: 2NO + O2 → 2NO2

2) PCl3 + Cl2 → PCl5 In this reaction, phosphorus trichloride (PCl3) reacts with chlorine gas (Cl2) to form phosphorus pentachloride (PCl5).

The balanced equation for this reaction is: PCl3 + Cl2 → PCl5

3) Fe + H2O → Fe3O4 + H2 In this reaction, iron (Fe) reacts with water (H2O) to form iron(II,III) oxide (Fe3O4) and hydrogen gas (H2).

The balanced equation for this reaction is: 3Fe + 4H2O → Fe3O4 + 4H2

4) CaCl2 + Na2CO3 → CaCO3 + NaCl In this reaction, calcium chloride (CaCl2) reacts with sodium carbonate (Na2CO3) to form calcium carbonate (CaCO3) and sodium chloride (NaCl).

The balanced equation for this reaction is: CaCl2 + Na2CO3 → CaCO3 + 2NaCl

5) NaBr + Cl2 → NaCl + Br2 In this reaction, sodium bromide (NaBr) reacts with chlorine gas (Cl2) to form sodium chloride (NaCl) and elemental bromine (Br2).

The balanced equation for this reaction is: 2NaBr + Cl2 → 2NaCl + Br2

6) Ca + HCl → CaCl2 + H2↑ In this reaction, calcium (Ca) reacts with hydrochloric acid (HCl) to form calcium chloride (CaCl2) and hydrogen gas (H2) is produced.

The balanced equation for this reaction is: Ca + 2HCl → CaCl2 + H2↑

7) Mg + O2 → MgO In this reaction, magnesium (Mg) reacts with oxygen gas (O2) to form magnesium oxide (MgO).

The balanced equation for this reaction is: 2Mg + O2 → 2MgO

8) H2S + O2 → H2O + SO2 In this reaction, hydrogen sulfide (H2S) reacts with oxygen gas (O2) to form water (H2O) and sulfur dioxide (SO2).

The balanced equation for this reaction is: 2H2S + 3O2 → 2H2O + 2SO2

9) Fe2O3 + H2 → Fe + H2O In this reaction, iron(III) oxide (Fe2O3) reacts with hydrogen gas (H2) to form iron (Fe) and water (H2O).

The balanced equation for this reaction is: Fe2O3 + 3H2 → 2Fe + 3H2O