Question

В каких парах между веществами при определённых условиях возможно химическое взаимодействие? 1)Гидроксид калия и оксид кремния (IV) 2)хлорид железа (II) и гидроксид натрия 3)хлорид калия и гидроксид бария 4)гидроксид кальция и оксид углерода (IV) Помогите пожалуйста

Answer 1

Ответ :
Возможно химическое взаимодействие в вариантах 1, 2 и 4.
Объяснение :
1) Гидроксид калия + оксид кремния (Ⅳ) ⇒ силикат калия + вода.
$\sf 2KOH+SiO_2 \to K_2SiO_3 + H_2O.$
Это типичная реакция взаимодействия щёлочи (KOH) с кислотным оксидом (SiO₂).
2) Хлорид железа (Ⅱ) + гидроксид натрия ⇒ гидроксид железа (Ⅱ) + хлорид натрия.
$\sf FeCl_2 + 2NaOH \to Fe(OH)_2\downarrow + 2NaCl.$
Это реакция ионного обмена с выпадением осадка (Fe(OH)₂↓).
3) Хлорид калия + гидроксид бария ⇏
$\sf KCl + Ba(OH)_2 \not\to$
Данная реакция ионного обмена не протекает, так как в ходе реакции не выделяется газа, осадка или малодиссоциирующего вещества.
4) Гидроксид кальция + оксид углерода (Ⅳ) ⇒ карбонат кальция + вода.
$\sf Ca(OH)_2 + CO_2 \to CaCO_3\downarrow + H_2O.$
Это типичная реакция взаимодействия щёлочи (Ca(OH)₂) с кислотным оксидом (CO₂).

Answer 2

Chemical Reactions Between Substances

When considering the possibility of chemical reactions between substances, it's important to evaluate the potential for ionic or covalent bonding under specific conditions. Let's examine the provided pairs of substances and their potential for chemical interaction.

1) Hydroxide of potassium and silicon (IV) oxide: - The hydroxide of potassium (KOH) and silicon (IV) oxide (SiO2) can undergo a chemical reaction to form potassium silicate and water. - The reaction can be represented as: ``` 2KOH + SiO2 → K2SiO3 + H2O ``` - This reaction involves the formation of ionic bonds between potassium and silicate ions, as well as covalent bonds within the silicon dioxide molecule.

2) Iron (II) chloride and sodium hydroxide: - Iron (II) chloride (FeCl2) and sodium hydroxide (NaOH) can react to form iron (II) hydroxide and sodium chloride. - The balanced chemical equation for this reaction is: ``` FeCl2 + 2NaOH → Fe(OH)2 + 2NaCl ``` - This reaction involves the exchange of ions, leading to the formation of a precipitate (iron (II) hydroxide) and a soluble salt (sodium chloride).

3) Potassium chloride and barium hydroxide: - Potassium chloride (KCl) and barium hydroxide (Ba(OH)2) can undergo a double displacement reaction to form barium chloride and potassium hydroxide. - The balanced chemical equation for this reaction is: ``` KCl + Ba(OH)2 → BaCl2 + 2KOH ``` - This reaction involves the exchange of ions between the two compounds, resulting in the formation of two new compounds.

4) Calcium hydroxide and carbon (IV) oxide: - Calcium hydroxide (Ca(OH)2) and carbon dioxide (CO2) can react to form calcium carbonate and water. - The chemical equation for this reaction is: ``` Ca(OH)2 + CO2 → CaCO3 + H2O ``` - This reaction involves the formation of a carbonate salt and water through the reaction of an alkali earth metal hydroxide with carbon dioxide.

In conclusion, under specific conditions, the mentioned pairs of substances can undergo chemical reactions leading to the formation of new compounds. These reactions involve the exchange of ions or the formation of covalent bonds, depending on the nature of the substances involved and the specific reaction conditions.