Question

a) Si---->SiO2---->Na2SiO3---->H2SiO3----> SiO2---->Siб) SiO2-->Si-->Ca2Si-->SiH4-->SiO2-->SiРассмотрите процессы окисления- восстановления

Answer 1

a)
Si + O2 ---> SiO2
SiO2 + Na2O ---> Na2SiO3
Na2SiO3 + H2SO4 ---> H2SiO3 + Na2SO4
H2SiO3 ---> SiO2 + H2O
SiO2 ----> Si + O2

 

Answer 2

si+o2=sio2; sio3+Na= Nasio3+o2; nasio3+H2=H2sio3; H2sio3+Na= sio2+NaOH; sio2=si+O2. я конечно не особо уверена, что это правильно, но где то примерно так. вторая цепочка по аналогии.

Answer 3

Processes of Oxidation and Reduction

The given chemical processes involve the oxidation and reduction of silicon (Si) and silicon dioxide (SiO2) into various compounds. Let's break down the processes and discuss the oxidation and reduction reactions involved.

a) SiO2 -> Si -> Na2SiO3 -> H2SiO3 -> SiO2 -> Si b) SiO2 -> Si -> Ca2Si -> SiH4 -> SiO2 -> Si

The processes involve the transformation of silicon and silicon dioxide into different compounds through a series of oxidation and reduction reactions.

The oxidation-reduction reactions involved in these processes can be summarized as follows:

1. Oxidation of Silicon (Si): - Silicon (Si) undergoes oxidation to form silicon dioxide (SiO2) through the reaction: Si + O2 ---> SiO2.

2. Formation of Sodium Metasilicate (Na2SiO3) and Silicic Acid (H2SiO3): - Silicon dioxide (SiO2) reacts with sodium hydroxide (NaOH) to form sodium metasilicate (Na2SiO3) and water (H2O): SiO2 + 2 NaOH ---> Na2SiO3 + H2O [[9]](https://otvet.mail.ru/question/12912026). - Sodium metasilicate (Na2SiO3) reacts with hydrochloric acid (HCl) to form silicic acid (H2SiO3) and sodium chloride (NaCl): Na2SiO3 + 2 HCl ---> H2SiO3 + 2 NaCl. - Silicic acid (H2SiO3) decomposes into silicon dioxide (SiO2) and water (H2O): H2SiO3 ----> SiO2 + H2O [[9]](https://otvet.mail.ru/question/12912026).

3. Reduction of Silicon Dioxide (SiO2) to Silicon (Si): - Silicon dioxide (SiO2) undergoes reduction to form silicon (Si) through the reaction: SiO2 -> Si [[1]](https://gomolog.ru/reshebniki/9-klass/gabrielyan-2014/35/4.html).

4. Formation of Calcium Disilicide (Ca2Si) and Silane (SiH4): - Silicon (Si) reacts with calcium hydroxide (Ca(OH)2) to form calcium disilicide (Ca2Si) and water (H2O): SiO2+Ca(OH)2 = 2 CaSiO3 + H2O. - Silicon (Si) reacts with magnesium silicide (Mg2Si) and hydrochloric acid (HCl) to form silane (SiH4), silicon (Si), magnesium chloride (MgCl2), and hydrogen gas (H2): 2 Mg2Si + 8 HCl = 4 MgCl2 + Si + 2 H2 + SiH4 [[10]](https://uchi.ru/otvety/questions/zakonchit-uravneniya-sleduyuschih-protsessov-sio2-ca-oh-2-na2sio3-hno3-h2sio3-caco3-sio2).

These reactions involve a combination of oxidation and reduction processes, leading to the formation of various silicon and silicon-containing compounds.

Overall, the given chemical processes involve a series of oxidation and reduction reactions that result in the transformation of silicon and silicon dioxide into different compounds, including sodium metasilicate, silicic acid, calcium disilicide, and silane.