A, B, C, D is a common substance in pure chemistry. Ask for the following?

If A is elemental, B, C, and D are oxides, and A and D can be combined into C at high temperatures, then A is?

Answer: A is carbon (c+CO2=2CO).

What is the chemical equation for the reaction between A and B? What are the chemical properties of a manifestation in the reaction?

Answer: A reacts with B: C + H2O = (high temperature) Co + H2 and exhibits reducibility.

If b is a gas and d is a solid, and a, b, c, and d all contain the same element, then what is the chemical equation for the reaction between b and c?

If A is a toxic gas and C is a red solid, then what is the chemical equation for the A-D reaction at high temperatures?

If a is not a toxic gas and other conditions remain the same, then a may be or ?

is C (carbon), B is H2O, C is Co, and D is CO2.

a＋b：c＋h2o==co+h2.Reductiveness.

It's Co and C is ferric oxide. d is carbon dioxide. Write the equation yourself.

Nothing else, ashamed.

A is C, D is CO2, the reaction equation is C+CO2=Co, the condition is high, and A shows reduction.

nh3+hcl=nh4cl

cl2+cu=cucl2

o2 h2

a: nab: na2o2

C: NaOH 2Na2O2 + 2H2O = 4NaOH + O2 tremor.

d:na2co3

E: NaHCO3 2NAHC3 = Heating Pose Nucleus Trace = Na2CO3 + H2O + CO2

(2) Master the requirements of alkaline gas in secondary school chemistry: NH3. Therefore, A is NH3 According to the transformation diagram, we can know that this is the transformation relationship of nitrogen group elements, and according to the title (B is one of the exhaust gases of the car, it will change color when exposed to air) This sentence can know that B is NO, because NO+O2 NO2 (unbalanced), so C is NO2

The chemical equation for reaction 3 is: NH4 + NO2 = N2 + 2H2O 6NO2 + 8NH3 = 7N2 + 12H2O

The first (4) can be known to contain Na according to (D is a gas that must be reported in the air quality forecast), and according to (the flame color reactions of A, B, and C are all yellow), it is known that it contains Na, and the flame reaction of Na is yellow. Then A is Naoh, B is Na2CO3, C is NaHCO3, B deterioration is to become NaHCO3, that is, to test Na2CO3 and NaHCO3, want to add hydrochloric acid to the solution, if there are bubbles immediately, it means deterioration, because:

In sodium carbonate, a small amount of drops of hydrochloric acid does not bubble at first, and only later.

Na2CO3 + HCl = NaCl + NaHCO3 But in sodium bicarbonate, a small amount of dropwise addition will also foam.

nahco3+hcl=nacl+h2o+co2

The second question is a is NH3, B is NO, C is NO2, and D is O2; The fourth question will not be.

a, h2o2 c. o2

1) 2H2O2 (hydrogen peroxide) = MNO2 = 2H2O + O2 2H2O = Energized 2H2 + O2

2) Hydrogen peroxide is made up of hydrogen peroxide molecules, whereas water is made up of water molecules. The same kind of molecule has the same chemical properties, and different kinds of molecules have different chemical properties.

3) Hydrogen peroxide to oxygen is simple to operate, with few instruments and no need for heating.

2h2o2==2h2o+o2

2h2o==2h2+o2

The chemical structure is different.

Because the cost of electrolyzed water is high.

H2O2 = H2O+O2 (gas symbol).

H2O = (energized) H2 (gas symbol) + O2 (gas symbol) The molecular structure is different.

It can be reacted at room temperature.

A+HCl produces gas, A should be a metal element, and B is chloride.

The purple reaction of the flame color is the K element, and AgNO3 (Hno3) is the reagent for the detection of Cl-, so D is KCl

E->F changes from white to reddish-brown in the air, which is a phenomenon of Fe(Oh)2 being converted into Fe(Oh)3 (there is also a gray-green process in the middle), so E is Fe(Oh)2 and F is Fe(Oh)3.

Extrapolating forward: B+C=D(KCl)+E(Fe(OH)2), B is FeCl2, C is Koh, and finally A is Fe

1) A is Fe, B is FeCl2, C is Koh, D is KCl, E is Fe(OH)2, F is Fe(OH)3, and G is FeCl3

2) It is to check whether there is Fe3+ in Fe2+, process: take a small amount of B with a test tube, add KSCN, if the solution turns blood red, it proves the existence of FeCl3.

3)4fe(oh)2+o2+2h2o=4fe(oh)3

4)2fe3+ +fe=3fe2+

1) A, B, C, D, E are five common substances in junior high school chemistry, C is often used to reduce soil acidity, so C is calcium hydroxide, E is a common liquid, calcium hydroxide will be converted into E, so E may be water, calcium hydroxide will be converted into D, D will be converted into water, so D may be calcium carbonate, A is elemental, B will be converted into A and water, so A may be oxygen, B may be hydrogen peroxide solution, hydrogen peroxide is generated under the catalytic action of manganese dioxide to produce water and oxygen, Hydrogen and oxygen form water under the condition of ignition, calcium hydroxide reacts with hydrochloric acid to form calcium chloride and water, calcium hydroxide reacts with carbon dioxide to form calcium carbonate precipitate and water, calcium carbonate reacts with hydrochloric acid to form calcium chloride, water and carbon dioxide, and the various substances introduced meet the transformation relationship in the question, and the positive judgment is derived, so d may be caCO3

A may be O2

2) Hydrogen peroxide is produced into water and oxygen under the catalytic action of manganese dioxide, and the chemical equation is: 2H2O2MNO

2h2o+o2

So the answer is: (1) caCO3

o22）2h2o2mno

2h2o+o2

Landlord, you are sure that one of the products obtained by the reaction of a dilute solution with d is oxygen, not hydrogen, if it is hydrogen.

b： o2 a：fe c fe3o4 e:naoh d:h2so4

The chemical formula Fe3O4---

Reaction with d -- Fe + H2SO4 = Feso4 + H2 -D reacts with E --2 NaOH + H2SO4 = Na2SO4 + 2H20 to be adopted.

One of the products of the reaction of a dilute solution with d should be hydrogen, right? If it is hydrogen, the answer is as follows: 1 Fe3O4

2 A and D:Fe+H2SO4 FeSo4+H2 Substitution Reaction D and E:H2SO4+2NaOH Na2SO4+2H2O Metathesis Reaction.

Your adoption gives me the motivation to keep trying!

Solution:1Fe3O4 (ferric tetroxide).

2.Fe+H2SO4 (dilute)--FeSO4+H2 (up arrow) displacement reaction.

3.H2SO4+2NaOH---Na2SO4+H2O metathesis reaction.

Chemistry is almost forgotten b is o2 sparks are iron and oxygen reaction 4 iron oxide 3 corrosivity should be sulfur then you can do it yourself.

Is there a mistake in your question, one of the products obtained by the reaction of a dilute solution of A and D should be hydrogen, if so, the answer is as follows:

A: Fe iron, B: O2 oxygen, C: Fe3O4 ferric tetroxide, D: H2SO4 sulfuric acid, E: Naoh, sodium hydroxide.

A+D:Fe+H2SO4=FeSo4+H2 (displacement reaction) D+E:H2SO4+2NaOH=Na2SO4+2H2O

1) State rot FeCl3 (1 point), AL(OH)3 or A1C13

Key 2) 3feo+2al=3fe+al2

o33) or manuscript sedan.

4）a12c16

and A1C13 for details.

What about the reactive formula, you can't solve it without the formula.