Question

Установите соответствие а) СaO + 2HCl → СaCl2 + H2O б) CaCl2+ Na2CO3→ Ca CO3↓ + 2NaCl в) Na2SO3+ 2HCl → 2NaCl + SO2↑ + H2O 1) СaO + 2H+→ Сa2++ H2O 2) Сa2++ CO32- → Cа CO3 ↓ 3) 2H+ + SO32- → SO2↑ + H2O Выручайте)

Answer 1

Chemical Equations and Reactions

Chemical equations represent the reactions that occur between different substances. In these equations, the reactants are written on the left side of the arrow, and the products are written on the right side. The coefficients in front of the substances indicate the relative amounts of each substance involved in the reaction.

Let's match the given chemical equations with their corresponding reactions:

a) CaO + 2HCl → CaCl2 + H2O This equation represents the reaction between calcium oxide (CaO) and hydrochloric acid (HCl) to form calcium chloride (CaCl2) and water (H2O).

b) CaCl2 + Na2CO3 → CaCO3↓ + 2NaCl This equation represents the reaction between calcium chloride (CaCl2) and sodium carbonate (Na2CO3) to form calcium carbonate (CaCO3) and sodium chloride (NaCl). The downward arrow (↓) indicates the formation of a precipitate.

c) Na2SO3 + 2HCl → 2NaCl + SO2↑ + H2O This equation represents the reaction between sodium sulfite (Na2SO3) and hydrochloric acid (HCl) to form sodium chloride (NaCl), sulfur dioxide (SO2), and water (H2O). The upward arrow (↑) indicates the release of a gas.

Now, let's discuss each reaction in more detail.

Reaction a: CaO + 2HCl → CaCl2 + H2O

This is a neutralization reaction between an oxide and an acid. Calcium oxide (CaO) reacts with hydrochloric acid (HCl) to form calcium chloride (CaCl2) and water (H2O). The reaction can be represented as follows:

CaO + 2HCl → CaCl2 + H2O

Reaction b: CaCl2 + Na2CO3 → CaCO3↓ + 2NaCl

This is a double displacement reaction between two ionic compounds. Calcium chloride (CaCl2) reacts with sodium carbonate (Na2CO3) to form calcium carbonate (CaCO3) and sodium chloride (NaCl). The reaction can be represented as follows:

CaCl2 + Na2CO3 → CaCO3↓ + 2NaCl

The downward arrow (↓) indicates the formation of a precipitate, which in this case is calcium carbonate.

Reaction c: Na2SO3 + 2HCl → 2NaCl + SO2↑ + H2O

This is a redox reaction between a sulfite and an acid. Sodium sulfite (Na2SO3) reacts with hydrochloric acid (HCl) to form sodium chloride (NaCl), sulfur dioxide (SO2), and water (H2O). The reaction can be represented as follows:

Na2SO3 + 2HCl → 2NaCl + SO2↑ + H2O

The upward arrow (↑) indicates the release of a gas, which in this case is sulfur dioxide.

I hope this explanation helps! Let me know if you have any further questions.