Oxygen hydrogen fuel cells convert thermal energy directly into electricity

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C test question analysis: hydrogen and oxygen fuel cells can directly convert chemical energy into electrical energy, not thermal energy, so A is wrong; It is impossible for any battery to achieve 100% energy conversion, so b is wrong; When the hydrogen and oxygen fuel cell is working, the hydrogen is oxidized at the negative electrode, because the hydrogen is converted into water, the valency increases, so the hydrogen is introduced and the negative electrode, so c is correct; D error, hydrogen-oxygen fuel cell with KOH solution as the electrolyte solution, the positive electrode reaction is O

2ho4e4oh is a positive electrode, not a negative electrode.

Comments: This question examines the basic knowledge of fuel cells, which is a hot spot in the college entrance examination, and this question is relatively easy.

No, it is the conversion of chemical energy into electrical energy.

In dye batteries, hydrogen and oxygen are not directly reactant. During operation, fuel (hydrogen) is supplied to the negative electrode and an oxidant (air, oxygen is the component that acts) to the positive electrode. Hydrogen decomposes at the negative electrode into positive ions H+ and electrons E-.

Hydrogen ions enter the electrolyte, while electrons move along the external circuit towards the positive electrode. The load of electricity is connected to the external circuit. At the positive electrode, oxygen in the air is absorbed by hydrogen ions from the electrolyte to form water as electrons reaching the positive electrode.

This is precisely the inverse process of the electrolysis reaction of water.

Fuel cells convert the chemical shield of fuel oxidation directly into electrical energy. (Buried Concessions).

a.That's right. b.Mistake.

Correct Answer: a

The reaction electrode is a loose and porous carbon rod.

Chemical energy is converted into electrical energy.

Hydrogen mill Zheng Qi oxygen turns into water, and chemical energy is reduced.

in acid solution.

The negative electrode reaction formula is: 2H -4E ==4H

The positive electrode reaction formula is: o +4h+ +4e = 2h o;

If it is in alkaline solution, there can be no H+, and in the acid blind burial solution, oh is also not possible

If the electrolyte solution is a alkali or salt solution.

The negative electrode reaction formula is: 2h +4oh -4e = 4h 0 positive electrode: o +2h o + 4e = 4oh if the electrolyte solution is an acid solution.

The negative electrode reaction formula is: 2H -4E = 4H + (positive ion), and the positive electrode: O +4E +4H+=2HO

The first is the galvanic cell, which, according to the "cation oxygen" (invented myself), undergoes an oxidation reaction at the yangda slip return electrode.

That is to say a reducing agent, that is to say an increase in price, that is to say the loss of electrons. In other words, the anode is the ** of the electron, that is, the negative electrode. So (1) the negative electrode is through hydrogen, and the positive electrode is through oxygen.

The positive electrode reaction is O2+4E-+2H20==4OH-, and the negative electrode reaction is H2-2E-+2OH-==2H20 (2) Since it is acidic, it should not be OH- but H+, so the positive reaction is O2+4E-+4H+==2H2O, and the negative reaction is H2-2E-==2H+ (3) Since the total reaction is 2H2+O2==2H2O, the pH does not change. (4) Hydrogen to methane.

Methane is still a reducing agent (it is conceivable that the carbon of methane is -4 valence, so the positive electrode reaction is still O2+4E-+2H20==4OH-, and the negative electrode is CH4+8E-+8OH-==CO2+6H2O The fourth question, (1) is actually the redox reaction of ferric ions and copper.

That is, 2Fe3+ +Cu==2Fe2+ +Cu2+ (2) The galvanic battery is still based on the "cation" anode = oxidation reaction = reducing agent = loss of electrons = negative electrode, so it should be copper as the anode, so copper is the negative electrode, and the positive electrode can be used as a graphite rod or platinum, etc., and the solution is of course ferric chloride.

Solution. Negative: Cu-2E-==Cu2+ Positive: Fe3+ +E-==Fe2+ It's over, but you have to learn how I do it. "Positive oxygen" is very useful, galvanic cell electrolytic cell.

Both apply. I won't draw the picture.

Chemical energy is converted into electrical energy.

Hydrogen oxygen turns into water, and chemical energy decreases.

There is an electric current in the external circuit that passes through the electrical appliance and converts it into electrical energy.

As for what electrical energy is converted into by electrical appliances, another story is said.

Answer: The reaction electrode is a loose and porous carbon rod.

Chemical energy is converted into electrical energy.

Hydrogen oxygen turns into water, and chemical energy decreases.

in acid solution.

The negative electrode reaction formula is: 2H -4E ==4H

The positive electrode reaction formula is: o +4h+ +4e = 2h o;

In the case of alkaline solution, there can be no H+, and in acid solution, OH is also not possible.

If the electrolyte solution is a alkali or salt solution.

The negative electrode reaction formula is: 2h +4oh -4e = 4h 0 positive electrode: o +2h o + 4e = 4oh if the electrolyte solution is an acid solution.

The negative electrode reaction formula is: 2H -4E = 4H+ (cation), and the positive electrode: O +4E +4H+=2HO

Hydrogen-oxygen fuel cells convert chemical energy into electrical energy.

What about other fuel cells? For example: natural gas – oxygen. Are there fuel cells with liquids and liquids or liquids and gases? 60%-70% ,

The principle of a fuel cell is an electrochemical device, the composition of which is the same as that of a general battery. The cell consists of two electrodes, positive and negative electrodes (the negative electrode is the fuel electrode and the positive electrode is the oxidant electrode) and an electrolyte.

The hydrogen-oxygen fuel cell reaction principle is the inverse process of electrolysis of water. The electrode should be: Negative:

H2+ 2OH-==2H2O +2E- Cathode: 1 2O2 +H2O +2E-==2OH- Cell reaction: H2 +1 2O2==H2O electrons:

b~~a

a. The mixture of oxygen and ozone is composed of one element, not elemental, so the choice is wrong;

b. The particles that make up the substance are: molecules, atoms, and ions, so they are wrong;

c. Hydrogen and oxygen fuel cells are used to directly convert the chemical energy of hydrogen and oxygen reaction into electrical energy for people's use, so it is correct;

d. The purpose of adding alum is to adsorb larger particles in the water and accelerate sedimentation, not sterilization and disinfection, so it is wrong

Therefore, c

a. The fuel cell is a device that converts chemical energy into electrical energy, so A is wrong;

b. The total reaction of the fuel cell is the reaction of hydrogen and oxygen to produce water, which is a device that converts chemical energy into electrical energy, so B is wrong;

c. In the hydrogen-oxygen fuel cell, the oxidation reaction occurs at the negative electrode of the power supply at one pole of hydrogen gas that is passed into the hydrogen.

The oxygen is introduced to the positive electrode of the galvanic cell and a reduction reaction occurs.

Therefore c is wrong; d. The fuel cell has a high energy conversion rate, and the product is water that has little impact on the environment, so D is correct and D is selected

a. Fuel cell is a device that directly converts the chemical energy of fuel into electrical energy without heat energy, and there is no loss of heat energy, so the same amount of methanol releases more electrical energy through the fuel cell than the electric energy generated by thermal power generation, so the statement is correct;

b. From the perspective of the discharge equation, there is oxygen to participate in the reaction, which belongs to oxidation and anti-decoration, but it is not the same as the lack of combustion, so the statement is wrong;

c. There are freely moving ions in the sodium hydroxide solution, which increases the conductivity of the solution, and sodium hydroxide participates in the reaction, which is conducive to the conversion of carbon into carbonate, so the statement is correct;

d. According to the charging reaction equation, there is a strong alkali sodium hydroxide generated, so during the charging process of the battery, the electrical energy is converted into chemical energy, and the alkalinity of the solution is enhanced, so the statement is correct;

Therefore, choose B