Chemistry questions, I m going crazy Chemistry questions, hurry, hurry

Thank God, it looks like our school straight to the top questions.

Tell me about my solution.

First of all, look at the substances given in the question which can produce precipitation and gas.

Again, the letters give more data.

Then make a comprehensive analysis yourself.

Now for the problem.

The precipitates are (AGNO3, HCl), (AGNO3, CACl2), (CaCl2, Na2CO3),

ba(no3)2,na2co3))、agno3,na2co3)。

The gases are produced (HCl, Na2CO3).

There is no need to list the problems solved too much.

Observe that **b,d gives more data.

D and one at most produce a precipitate or gas, so d must be Ba(NO3)2b at most and two substances produce a precipitate or gas, so B is not Na2CO3, AgNO3, Ba(NO3)2

When observing Na2CO3, he has a pronounced reaction with any other substance.

So a is na2co3

B and C have been observed to not react with each other, and both have 2 blanks left unfilled.

So immediately think that b and c are CaCl2 and HCl

then e is agno3

and (b,a) produce precipitation.

So b is CaCl2

C is a summary of HCL.

A is Na2CO3

b is cacl2

C is HCLD and BA(NO3)2

e is agno3

To be honest, the most important way to do material inference problems is intuition.

You have to do more questions.

When doing the problem, simply think about the relationship between objects.

Even guess and then bring it to the question for verification.

B is different from A, is sodium hydroxide and carbon dioxide reaction, chemical change B, concentrated sulfuric acid water absorption, physical change.

c, quicklime absorbs water and becomes mature lime (calcium oxide, becomes calcium hydroxide), chemical change d, iron becomes iron oxide, chemical change.

b is not a chemical reaction, everything else is.

Ignition = CO2

ignition = SO2

Ignition = 2p2o5

Ignition = Fe3O4

Ignition = 2h2o

Ignition = 2mgo

Heating = K2mNO4 + MNO2 + O2

Heating = 2kCl + 3O2

Heating = 2Hg + O2

Energized = 2H2 + O2

1.（1）al2o3•2sio2•2h2o（2）k2o•al2o3•6sio2

pbs+4h2o2==pbso4+4h2o3.The third question is a troublesome ......When I went to college, I didn't count this kind of troublesome question......I'm sorry I don't have time to count ......Sorry ha.

A: H2O B decomposes into C: 2H2O2==Mno2==2H2O+O2

A molecule is the smallest particle that maintains the chemical properties of a substance. The molecular composition of A and B is different, A is composed of one oxygen atom and two hydrogen atoms, and has been composed of two oxygen atoms and two hydrogen atoms.

The most abundant element in the earth's crust is oxygen, and C is elemental, and it can be released through B, so C is O2, so B is H2O2, and A is H2O, and the equation is the equation in which H2O2 decomposes under the condition of Mno2, and the difference is that they are composed of different atoms.

A: H2O B: H2O2

C: O22H2O2 + catalyst = 2H2O + O2

The reason for the difference is that hydrogen peroxide has hydrogen oxide, which is the reason why it is used as disinfectant.

Why is it the same as the question I did. = =

h202 2h202=h2↑ +02↑

The molecular makeup of the two substances is different.

H2O2 2 H2O=2H2+O2 (gas plus shears) A has one more O—O bond than B.

1) Grams of hydrogen are generated, and according to the chemical equation, it is known that the mass of iron participating in the reaction is grams. So.

2) There is a topic to know that this steel is a high-carbon steel.

3) Because iron reacts with oxygen in the air to form iron oxide, the mass of oxygen added is greater than the mass of carbon decreased.

1) When the cap of the soda bottle is opened, the pressure in the bottle decreases, and the solubility of carbon dioxide decreases, so it will be automatically ejected.

2) After drinking soda, the solubility of carbon dioxide contained in the soda decreases and escapes because the body temperature is higher than the soda temperature, so burping will occur.

3) When filling beverages, the conditions for adding carbon dioxide gas: low temperature, pressurization.

There is such an equilibrium in the soda bottle H2O + CO2 = H2CO31) to decompress and the balance shifts to the left.

2) Heat up and shift the balance to the left.

3) High pressure, low temperature.