Question

ХИМИЯ 30 БАЛЛОВ Закончить уравнения реакций, расставить коэффициенты, назвать продукты, указать тип реакций: 1) K + H2S 2) HNO3 + CaO 3) H3PO4 + MgCl2

Answer 1

2 K + H2S → K2S + H2
Это окислительно-восстановительная (редокс) реакция
H2S является окислителем, K является восстановителем.

2 HNO3 + CaO → H2O + Ca(NO3)2
Это кислотно-щелочная реакция (нейтрализа́ция): HNO3 представляет собой кислоту, CaO является щелочным.

2 H3PO4 + 3 MgCl2 → 6 HCl + Mg3(PO4)2

Answer 2

1) K + H2S

To balance the equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation.

The balanced equation for the reaction between potassium (K) and hydrogen sulfide (H2S) is:

2K + H2S -> K2S + H2

In this reaction, potassium (K) reacts with hydrogen sulfide (H2S) to form potassium sulfide (K2S) and hydrogen gas (H2). This is a combination reaction.

2) HNO3 + CaO

To balance the equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation.

The balanced equation for the reaction between nitric acid (HNO3) and calcium oxide (CaO) is:

2HNO3 + CaO -> Ca(NO3)2 + H2O

In this reaction, nitric acid (HNO3) reacts with calcium oxide (CaO) to form calcium nitrate (Ca(NO3)2) and water (H2O). This is a double displacement reaction.

3) H3PO4 + MgCl2

To balance the equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation.

The balanced equation for the reaction between phosphoric acid (H3PO4) and magnesium chloride (MgCl2) is:

2H3PO4 + 3MgCl2 -> Mg3(PO4)2 + 6HCl

In this reaction, phosphoric acid (H3PO4) reacts with magnesium chloride (MgCl2) to form magnesium phosphate (Mg3(PO4)2) and hydrochloric acid (HCl). This is a double displacement reaction.

Please note that the coefficients in the balanced equations represent the relative number of molecules or moles of each substance involved in the reaction.