High One Chemistry is related to Na.

This question was taught more than 10 times, 1 time for each student.

This question is easier to test the ratio of the quantity of matter.

Sodium reacts with water to produce hydrogen, and sodium peroxide reacts with water to produce oxygen.

The gas mixture is energized and discharged, and it happens to be completely reacted.

It is proved that the mass ratio of hydrogen and oxygen meets the requirements of 4:32, and the reverse formula is 2h2+o2=2h2o, so there is hydrogen, oxygen.

Hydrogen is needed if you have it.

2na+2h2o=h2+2naoh

To have oxygen, sodium peroxide is required.

2na2o2+2h2o=o2+2naoh

Sodium oxide remains.

Pick D. Korean teacher student.

The resulting gas is hydrogen and oxygen, which reacts completely and has a total mass, then mh2:mo2=1:8, so mh2=, mo2=, nh2=, no2=.

2na+2h2o==2naoh+h2，nna=，mna=

2na2o2+2h2o==4naoh+o2,nna2o2=,mna2o2=,mna:mna2o2=23:39=46:78, choose d.

d happens to react completely then h2:o2=2:1

The molar mass of oxygen can be set to be x, then 4x+32x= x=hydrogen is mo, sodium is mosa; Oxygen is mo, and sodium peroxide is mo.

D is then calculated

Suppose the amount of hydrogen and oxygen produced is x y, respectively

2na--h2

2x x 2na2o2---o2

2y y due to the ratio of the amount of substances that hydrogen reacts with oxygen exactly 2:1x=2y2x+32y=

x= y =

The quality of sodium metal.

The quality of sodium peroxide.

The quality of sodium oxide is d

Categories: Education, Science, >> Learning Aid.

Problem description: About NA.

Analysis: Sodium and water interaction:

2na+2h2o===2naoh+h2↑

Sodium oxidizes slowly in air:

4na+o2===2na2o

Sodium ignited in an air gauge hood:

2na+o2===na2o2 (ignition).

Sodium and chlorvul gas:

2Na+Cl2===2NaCl (ignition).

Sodium and sulfur action:

2na+s===na2s (grinding).

Sodium oxide is soluble in water:

na2o+h2o===2naoh

Sodium peroxide reacts with water:

2Na2O2+2H2O===4NaOH+O2 Sodium peroxide and carbon dioxide (oxygen production from submarines):

2Na2O2+2CO2===2Na2CO3+O2 Sodium bicarbonate decomposes by heat:

2NaHCO3===Na2CO3+H2O+CO2 Sodium carbonate reacts with water and carbon dioxide:

Na2CO3 + H2O + CO2 ===2 NaHCO3 sodium and copper sulfate solution reaction:

Na+CuSO4+2H2O===Na2SO4+Cu(OH)2+H2 This is only a part, but it basically includes the chemical equation of the high alkali metal chapter Ling Tangerine Sodium

Oxidized to Na2O:

4na + o2 = 2na2o

Ignite to form Na2O2

2na + o2 == na2o2

2na+cl2 == 2nacl

It can be reacted at room temperature

2na + s = na2s

React violently with cold water at room temperature:

2na+2h2o=2naoh+h2↑

2na+2hcl=2nacl+h2↑

with copper sulfate solution:

2Na+2H2O+CuSO4=Cu(OH)2+Na2SO4+H2 with ferric chloride solution:

6na+6h2o+2fecl3=2fe(oh)3↓+6nacl+3h2↑

na2o+h2o=2naoh

Na2O+2HCl=2NaCl+H2O (solution colorless) Na2O+CO2=Na2CO3

2NaOH + CO2 = Na2CO3 + H2ONAoh + CO2 (excess) = NaHCO3

Na2CO3+H2O+CO2 = 2NaHCO32NaHCO3 == Na2CO3+H2O+CO2 in solution: Na2CO3+Ca(OH)2 = 2NaOH+CaCO3 in solution: NaHCO3+Ca(OH)2 = NaOH+CaCO3 +H2O

2na+2h2o=2naoh+h2o

2na+o2=na2o2

4na+o2=na2o

na2+s=na2s

Na+KCl = high temperature = NaCl + K gas.

The above are all reflecting the reducing properties of sodium element, mainly to grasp the reaction of sodium and H2O to release hydrogen and generate sodium hydroxide, not only the amount of the product but also the specific phenomenon of the reaction, that is"Floating melt swims red", which is the focus of the investigation. In addition, Na2O2 is also tested a lot, mainly for the analysis of reaction products.

c reaction to generate NaOH

2al + 2naoh + 2h2o *****=2naalo2 + 3h2

This will also emit h2

So choose C

Sodium first reacts with water to form hydrogen and sodium hydroxide, and sodium hydroxide reacts with aluminum to form part of hydrogen, so c

2Na +O2 = (room temperature) 2NaO

2Na +O2 = (heat) Na2O2

2Na +2H2O==2NaOH + H2 (gas symbol) 2Na CO2 (heating) 2NaO C

2Na 2HCl NaCl H2 (gas symbol) 2Na H2SO4 Na2SO4 + H2 (gas symbol) 2Na+2Hno3==2nano3+H2 (gas symbol).

Let Na be completely oxidized to Na2O Let Na be completely oxidized to Na2O2, 2Na Na2O 2Na2O2

46g 62g 46g 78g

m(na2o) m(na2o2)

i.e.: m(na2o)= i.e.: m(na2o2)=

Therefore, the oxidation product should be a mixture of two Na2O and Na2O2. c

Thrown into the water: Phenomenon: Floats on the surface of the water, melts into small balls, swims around, and makes a hissing sound (abbreviation:

floating, sphering, swimming, singing) properties: floating: proving that sodium is denser than water pellets:

Proof that the melting point of sodium is low: It proves that all the gas is released, and the ball is pushed around: it is the sound reaction of the gas emptying:

2na+2h2o=2naoh+h22.The sodium combustion flame is pale blue and produces a pale yellow solid: Na2O23

The change of sodium input into CuSO4 solution: there is gas released, and the blue precipitate equation is generated as follows: 2Na + 2H2O + CuSO4 = Na2SO4 + Cu(OH)2 + H24

Industrial sodium metal: 2NaCl=2Na+Cl2 (electrolytic molten sodium chloride) 5The same amount reacts with a sufficient amount of hydrochloric acid, and the most H2 is produced

If it is the amount of equal substance: the most hydrogen gas produced is: al if it is equal mass:

The most hydrogen produced is also the nature of Al-6 sodium.

Sodium belongs to the third period group I element and has a charge number of one, so it is more reactive. Sodium is a metallic element that is silvery-white before oxidation, but can be oxidized to black after only a short exposure to air. I still remember that when the teacher gave us an experiment, he used a knife to cut a small piece of each of us, and we couldn't cut the general metal with a knife, which can show that the texture of sodium is relatively soft, of course, it is also solid, otherwise how to cut it.

Sodium also has a flame color reaction, which is generally yellowish in color.

The chemical properties of sodium are mainly due to the fact that the number of electrons outside the nucleus is one, which is determined in the third period, it is more active than lithium of the same family, but compared with potassium, rubidium and cesium of the same family, it is not rubidium They are active, sodium is easy to react with oxygen and be oxidized; Sodium is also very useful in reacting with water, making a sizzling sound and bubbling on the surface of the water, because it reacts with water to release a lot of heat and produces hydrogen. Due to these two properties, sodium is often preserved in kerosene and only temporarily removed from kerosene when used.

Sodium is the first major element of the third period, the atomic number is 11, the relative atomic mass is 23, sodium is an extremely reactive metal, in the air can react with oxygen to obtain sodium oxide, cauterization to obtain yellow sodium peroxide. Sodium can also react with carbon dioxide and water to give sodium carbonate and sodium hydroxide (+ hydrogen), respectively. Sodium can also replace hydrogen on the hydroxyl group of alcohol.