The teaching design of The Protagonist of Inorganic Non metallic Materials: Silicon , a compulsory

Silicon is a non-metallic element, located in the fourth main group of the third period, and since its outermost shell has a number of electrons of 4, it is neither easy to make electrons, nor is it easy to make electrons. Mainly tetravalent compounds are formed. At the same time, silicon is the basic element that makes up rocks and many minerals.

Silicon is an oxygen-friendly element that always interacts with oxygen in nature. Silicon is mainly found in the form of oxides and silicates with high melting points. The main component of sand is silica, which accounts for about 12% of the mass of the earth's crust, and silicon is the most abundant non-metallic element in the earth's crust.

Monocrystalline silicon has a similar structure to diamond, is a gray-black solid with metallic luster, a melting point of 1410 degrees Celsius, hardness and brittleness, and chemical inactivity at room temperature.

Due to the transition position between metallic and non-metallic elements in the periodic table, the conductivity of monocrystalline silicon is between conductors and insulators, and it is a good semiconductor material. The composition of computer chips is silicon, in addition, Gaochun monocrystalline silicon can also be used in photovoltaic cells, artificial satellites, solar electric vehicles and other fields.

Reaction regarding silicon: Si + 4HF = SiF4 (gas) + 2H2 (gas).

h2o+si+2naoh=na2sio3=2h2

Si + O2 = high temperature = SiO2

Silica A silica crystal is an atomic crystal with silicon in the center and oxygen at the four apex angles, and the angle between oxygen is 109 degrees 28 minutes. The main ingredient of crystal and agate is silica, and the quartz in life is it. Due to its network-like structure, silica is used in the manufacture of modern optical and optical fiber products.

Great, simple substances are used to make semiconductors, silicon, silica is used as optical fibers. Silica is soluble in hydrofluoric acid and the resulting silicon tetrafluoride is gaseous, there is silica, with sodium hydroxide sodium silicate (sodium hydroxide, sodium silicate commonly known as) common viscosity, glass composition in the reaction, in order to install a strong alkali without glass stopper, with a rubber stopper.

There are too many, the element is used to make semiconductors, silicon chips, and silicon dioxide is used as optical fibers. Silica is only soluble in hydrofluoric acid and the silicon tetrafluoride generated is gaseous, and there is silica in the glass composition, which can react with sodium hydroxide to form sodium silicate (commonly known as sodium silicate, bubble alkali) has adhesion, so the strong alkali does not use a glass stopper, and a rubber stopper should be used to ......

There are very few test centers for this part of the test. Sodium silicate is water glass, which is used as a binder and is fireproof; Silica is commonly known as crystal, and it is often composed of optical fibers; Silicon is often used in electronic devices; Glass, cement, and ceramics contain silicate components.

The properties of silicon should be in the book.

Solution: Due to.

So when the reaction is over, there is gas in the mixture.

When O2 is completely consumed during the reaction, the percentage of CO2 in the mixed gas is at the end of the reaction.

The amount will reach the maximum value, so only the destruction of the finch needs to calculate its maximum volume fraction, i.e. the family can be.

Assuming that O2 is consumed, according to the ratio of O2 to N2, it can be seen that the mixture contains N2 after the reaction, and the maximum percentage of CO2 is 46%.

Taken together, the answer is ab

(1) At high temperature, silicon and carbon monoxide are generated by reducing silica with carbon, and the reaction equation is SiO2 +2C high temperature

Si + 2Co, so the answer is: SiO2 +2C high temperature

si+2co↑；

2) HCl is soluble in water, and SiHCL3 reacts strongly with H2O, so the method of purifying SiHCL3 can only be carried out by fractional distillation by using their different boiling points under anhydrous conditions, so the answer is: distillation;

3) It is known that the reaction SiHCL3 +H2 occurs

High temperaturesSi+3HCl, the reaction is a reaction between a single substance and a compound to form another element and another compound, which belongs to the displacement reaction, so the answer is: displacement reaction;

4) Iron reacts with hydrochloric acid to produce Fe2+, and its test method is often to oxidize Fe2+ to Fe3+ and then add KSCN solution to see if it turns red to test, so choose: AC

1) Silicon and carbon monoxide are generated by reducing silica with carbon at high temperature, and the reaction equation is SiO22C high temperature Si+2Co, so the answer is: SiO22C high temperature Si+2Co;

2) HCl is easily soluble in water, while SiHCl3

It reacts strongly with H2O, so SiHCL3 is purified

The method can only use their different boiling points under anhydrous conditions, and the method of fractional distillation is adopted, so the answer is: distillation;

3) It can be seen that the reaction SiHCL3H2 high temperature Si+3HCl, which is a reaction between a single substance and a compound to form another element and another compound, belongs to the silver-smiling and empty-to-empty exchange reaction, so the answer is: displacement front blind reaction;

4) Iron reacts with hydrochloric acid to produce Fe2+

The test method is often Fe2+

Oxidized to Fe3+

Then add KSCN solution to see if it turns red to test, and rise stupid.

Therefore, we choose: ac

.In the SiC+2Co reaction, there is no change before and after the valency reaction of Si elements, when 3molc participates in the reaction, 1molSiC is generated, indicating that 1molC plays the role of oxidant, and 2molCO is generated, indicating that 2molc plays the role of reducing agent, then the ratio of the amount of oxidant to the reducing agent is 1:2, and the mass ratio is 1:

2；So the answer is: 1:2