Please list a few of the physical properties of the metal sodium, in addition to color and density

Metal: sodium, silvery-white metal, soft, low melting and boiling point, less dense than water, and can conduct electricity and heat.

Properties of carbon tetrachloride.

1.Carbon tetrachloride is a colorless, clear and easy-to-flow liquid, sometimes yellowish due to impurities, aromatic odor, and volatile. Specific gravity (20) melting point, boiling point 76 77.

2.Carbon tetrachloride vapor is about 5 times heavier than air and does not burn, and it is often used to extinguish fires, especially gasoline, oil and other oils that cannot be mixed with water, as well as electrical fires. Once carbon tetrachloride is converted into vapor, it sinks to the lower part of the air, expelling the air and extinguishing the flame.

3.Carbon tetrachloride vapor is toxic, it is less narceptive than chloroform, but it is more toxic, and should not be inhaled into the human body. Inhalation of 2 4 ml can kill a person.

4.Carbon tetrachloride has very little solubility in water and gradually decomposes into hydrochloric acid when exposed to moisture and light. Soluble in various organic solvents, can be mixed with alcohol, ether, chloroform, benzene, etc. It is an excellent solvent for fats, oils and a variety of organic compounds.

Sodium metal is highly active and has a low density, so it is often stored in which of the following substances () aWater. b.Kerosene.

c.Brown bottle.

d.Solid paraffin.

Correct answer: B

The physical properties of sodium metal are as follows:

1. Sodium is a silvery-white cube structure metal, sodium is soft and light, can be cut with a knife, the density is high, and it has corrosion resistance. Its melting point is 883. Sodium is easily oxidized in the air and turns into a dark gray color.

Sodium elemental has good ductility, soluble in mercury and liquid ammonia, and soluble in liquid ammonia to form a blue solution. Sodium has good magnetic conductivity and is a good conductor of heat and electricity.

2. Sodium is located in the 3rd period, group a in the periodic table, and is a representative of alkali metal elements. Sodium is widely distributed in the form of salt on land and in the sea, and sodium is also one of the important components in human muscle tissue and nerve tissue. The chemical properties of sodium are very active, and when heated at room temperature and heated, they are combined with oxygen, and react violently with water, and occur when the amount is large**.

Sodium can also be burned in carbon dioxide, react with low-element alcohols to produce hydrogen, and react with liquid ammonia, which has a weak ionization capacity.

The effects and uses of sodium on the human body are as follows:

1. Stabilize blood pressure: sodium is an important electrolyte in the human body, the main cation of extracellular fluid, and an important factor in maintaining the osmotic pressure and capacity of extracellular liquid crystal. When sodium is increased, blood volume can increase, and vice versa, blood volume can decrease, which is important for maintaining blood pressure stability.

2. Regulate the balance of body fluids: the buffer base in plasma is mainly sodium bicarbonate, which often rises and falls with the increase or decrease of sodium amount, so sodium ions also have a certain role in regulating the acid-base balance of body fluids.

3. Other functions: maintain neuromuscular excitability, constitute a sodium pump, maintain the balance of sodium and potassium ions inside and outside the cell, pure fiber, etc.

When the body is deficient in sodium, the patient can have apathy, weakness, nausea, vomiting, blood pressure drop, muscle cramps and other manifestations, and when the sodium level is too high, the patient can have hallucinations, delirium, thirst, oliguria and other symptoms.

4. Sodium metal is used as a reducing agent to prepare metals such as titanium, zirconium and tantalum. In the foundry industry, it is used as an aluminum-silicon alloy deterioration agent, so that the silicon in the alloy crystal becomes a fine fiber structure to improve the strength and plasticity of the alloy. In the chemical industry, it is used to prepare chemical products such as indigo dye, trimethylphenyl phosphate, fatty alcohol, sodium borohydride, sodium azide, sodium methoxide, sodium ethanol, sodium peroxide, sodium hydride and sodium amino.

Knife cut: physical properties, low hardness.

Floats on water: physical properties, less dense than water.

Water reacts violently: chemical properties, can react with water.

Swim rapidly on the surface of the water: chemical properties, react with water to produce gas that melts into a silvery-white ball: physical properties, silvery-white, low melting point, chemical properties, react with water to exothermic.

Physics: Soft in substance, less dense than water, lower in melting point.

Chemistry: It can react with water and produce gas.

Physical properties: silvery-white, low hardness, less density than water, low melting point, easy heat transfer, electrical conductivity.

Chemical properties: Reacts with oxygen, water, acids (such as hydrochloric acid), salts (such as copper sulfate solution), certain organic substances (such as ethanol).

(1) Some physical properties of sodium metal: silvery-white metal, soft, low melting point, good conductor!

2) Chemical Properties:

2na+ 2h2o == 2naoh + h22na + 2hci == 2naci + h24na + o2 == 2na2o

4na + 2o2 == 2na2o2

6na + 2feci3 + 6 h2o == 6naci + 2fe(oh)3 +3 h2

Chemical properties of sodium.

The outermost shell of the sodium atom has only 1 electron and is easily lost. Therefore, sodium is a reactive metal element, chemically very reactive, and able to react with a variety of substances. The main manifestation of sodium elemental is reductive. Manifested in:

1.Reaction of sodium with oxygen.

at room temperature.

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1) Knowledge list of sodium metal 1 Physical properties of sodium (1) White: silvery-white. (2) Light:

The density is small, p(n. )=0．97 g／cm3。(less dense than water).

3) Low: low melting point and boiling point, melting point 97, boiling point 882. (4) Small:

The hardness is small, and the metal sodium can be cut with a knife. (5) Conduction: Sodium is a good conductor of heat and electricity.

2 Structural characteristics of sodium (1) Schematic diagram of atomic structure: the outermost shell has only one electron, which is easy to lose. It exhibits strong reducing properties and is a chemically reactive metal.

2) Valency: There are two kinds of valence: 0 valence and +i valence, so the valency of elemental sodium can only be increased, that is, it only has reductiveness. 3 Chemical properties of sodium: (i) sodium and O2 region (2) sodium reaction with other non-metals (3) reaction between sodium and water (4) reaction between sodium and acid (5) reaction between sodium and alkali and salt solution 4 important uses of sodium (1) important compounds for the preparation of sodium, such as Na202.

2) Sodium potassium alloy is used as a thermal conductive agent for atomic reactors. (3) As a reducing agent for smelting certain rare metals. Such as smelting titanium, niobium, zirconium, etc.

4) It is used in electric light sources where yellow light is generated. 5 The existence of sodium does not have free sodium, but only exists in a chemical state, and it is widely distributed, mainly in the form of NaCl, and there is also Na2SO4. (Miscanthus).

NA2C03 (in saline lands and some salt lakes) and NAN03 (saltpeter). 6 The electronic ability to prepare and preserve Na+** sodium is very weak, and the change to be achieved is usually electrolytic. For example, the preservation of sodium is mainly to achieve "two preventions", one of which is 02 and the other is H20.

Therefore, a large amount of sodium is tightly sealed, and a small amount of sodium is kept in kerosene.

It is mainly manifested in chemical and physical properties.

Sodium is a silvery-white cube-shaped metal, soft and light, which can be cut with a knife, and its density is smaller than that of water, is, melting point, boiling point:. The new section has a silvery-white luster, which is oxidized in the air and turns into a dark gray, which is corrosion-resistant. The sodium carrier source is a good conductor of heat and electricity, with good magnetic conductivity, and the potassium-sodium alloy (liquid) is the thermal conductive agent of nuclear reactors.

Sodium element also has good ductility and low hardness, and can be soluble in mercury and liquid ammonia, and soluble in liquid ammonia to form a blue solution. Hardens at -20.

The chemical properties of sodium are very active, and it is imperative to normal temperature and heating.

Properties of sodium metal.

When it is combined with oxygen, it reacts violently with water, and when the amount is large, it reacts with low alcohols to produce hydrogen, and it can also react with liquid ammonia, which has a very weak ionization ability.

4Na + O2 = 2Na2O (room temperature).

2Na+O2= Na2O2 (heated or ignited).

2Na+2H2O=2NaOH+H2, 2Na+H2O==High temperature==Na2O+H2

2Na+2RoH=2rona+H2 (RoH stands for low elemental alcohol).

2na + 2nh3（l） =2nanh2 +

H2 ("2NH3(L)" in this reaction denotes liquid ammonia).

The outermost shell of the sodium atom has only 1 electron and is easily lost, so it is strongly reducible. Therefore, the chemical properties of sodium are very active, and can react with a large number of inorganic substances, most of the non-metallic elements and most of the organic substances, and when the redox reaction with other substances, it is used as a reducing agent, which is from 0 valence to +1 valence (due to NS1 electron pairs), usually combined in the form of ionic bonds and covalent bonds. The metallicity is strong, and its ionic oxidation is weak.

The relative atomic mass of sodium is.

High school chemistry believes that sodium salts are soluble in water, but in fact, sodium uranyl zinc acetate, sodium uranyl magnesium acetate, sodium uranyl nickel acetate [5], sodium bismuth, sodium antimonate, and sodium titanate are insoluble in water.

Sodium is darkened in the air: 4Na + O2 = 2Na2O (white) Sodium combustion: 2Na + O2Na2O2 (light yellow) The reaction conditions are different, and the products are different.

Sodium in water: 2Na + 2H2O = 2NaOH + H2 2Na + 2H2O = 2Na+ +2OH + H2 Phenomenon: floating, melting, swimming, ringing, red).

Sodium and hydrochloric acid (acid first and then water): 2Na+ 2HCl===2NaCl+H2 2Na+2H+===2Na+ +H2

Sodium and copper sulfate solution (water first and then salt): 2Na+2H2O+CuSO4=Na2So4+Cu(OH)2 +H2 (total).

2na+2h2o=2naoh+h2↑

2naoh+cuso4=cu(oh)2↓+na2so4

Sodium metal is basically only reducible.

Can react with non-metallic elements:

Slow oxidation in air: 4Na + O2 ===2Na2O combustion in oxygen: 2Na + O2== ignition ==Na2O2 and halogens etc reaction: 2Na + Cl2 ====2NaCl (exothermic to produce white smoke).

Reaction with hydrogen: 2NaH2 high temperature 2NaH

It can react with water to displace hydrogen from the water, or it can react with acid

2Na + 2H2O ====2NaOH + H2 (gas) 2NaNa + 2HCl ====2NaCl + H2 (gas) reacts with the salt solution, first with water in the salt solution, then with NaOH and further with the salt (if possible).

Add sodium elemental to the copper sulfate solution:

2Na + 2H2O ====2NaOH + H2 (gas) 2NaOH + CuSO4 ====Cu(OH)2 (precipitate) + Na2SO4

and salt reaction in the molten state:

Na + KCL== High temperature ==K + NaCl can react with some organic matter.

2na + 2c2h5oh --c2h5ona + h2 (gas) is about that

I wish you good luck in your studies

Knife: physical properties, low hardness.

Floating on water: physical properties, less dense than water.

Water reacts violently: chemical properties, can react with water quickly on the surface of the water.

Chemical properties, reacts with water to produce gas.

Melt into a silvery-white ball: physical properties, chemical properties, silvery-white, low melting point, chemical properties, exothermic reaction with water.

Sodium is a third-period A element, the outermost electron is 1 electron, which is easily lost, so sodium is a very reactive metallic element, with +1 valence in all compounds. The main properties are: 1. Reaction with non-metallic elements

Reaction with O2 (sodium oxide obtained without heating, sodium peroxide obtained by heating), chlorine, sulfur and other 2Na+Cl2 2NaCl 2Na+S Na2S 2, and compounds: (1) React violently with water and sodium to generate sodium hydroxide and hydrogen.

2Na + 2H2O 2NaOH + H2 (Phenomenon: floating, melting, swimming, ringing, red) (2) and salt solution Reaction with salt solutions such as copper sulfate 2Na + 2H2O + CuSO4 = Cu (OH) 2 (precipitation) + Na2SO4 + H2 (gas) (3) With ethanol 2Na + 2C2H5OH --C2H5ONA + H2 (not as violently as it reacts with water) It can also react with organic compounds containing hydroxyl groups such as phenol and carboxylic acids. 3. Sodium has strong reducing property and can replace metal from some molten metal halides.

In addition, sodium also reacts with liquid ammonia, which is not required to be mastered, and can be consulted if you want to expand. 4. Sodium only exists in the form of chemical compounds in nature, usually in kerosene. Schedule:

Conversion of sodium compounds.