Please solve a few chemistry problems quickly, who can help me solve a few chemistry problems, befor

2) No, you can't. Because the preparation of calcium oxide is carried out by calcining limestone at high temperatures, an equivalent amount of carbon dioxide will be produced.

3) I don't see the diagram.

I would like to add a little upstairs: (1) The liquid in the U-shaped tube in B will not be flat. Although the density of CO2 is greater than that of air, and it is not easy to diffuse from the air when the temperature rises, it should be noted that the volume of CO2 in bottle B is only 5%.

Therefore, the liquid level in the U-shaped tube will still be low on the left and high on the right (because the air is heated and expanded, and the air in the bottle will spread outward), and the difference between the liquid level on the left and right is smaller than that of A. In addition, it is wrong to say that "long-term inhalation of CO2 will affect people's health" and should be changed to "When the percentage of CO2 in the air is high, people will be harmed by the lack of O2 inhalation".

Q: (2) A student saw this report and was inspired to design a plan to reduce carbon dioxide emissions: cao+h2o=ca(oh)2 co2+ca(oh)2=caco3 +h2oDo you think the student's design idea can reduce carbon dioxide emissions into the atmosphere?

Please provide a brief explanation of the reasons for this. A: No, you cannot.

The reason for this is that the cost is too high. Q: (3) Students from the chemistry group of a school have done the following experiments on the impact of excessive carbon dioxide emissions into the air.

During the experiment, they irradiated both devices in the same environment at the same time for the same time (the red liquid in the glass tube did not react with the components in the air). What are the observable phenomena during the experiment? What are the conclusions that can be drawn from analyzing the differences in the above experimental phenomena?

Answer: The liquid level of the U-shaped tube is low on the left and high on the right (the gas expands when heated) and the liquid level difference in Figure B is larger (indicating that CO2 has a thermal insulation effect) The increase in CO2 content in the air leads to an increase in temperature (which explains the cause of global warming).

2) Not feasible because the cost of using calcium hydroxide is too high. (3) The red liquid of the U-shaped tube of bottle A and bottle B both showed the phenomenon of low left and high right, but the liquid level difference of the red liquid of the U-shaped tube of bottle B was larger than that of A. Conclusions drawn:

When the amount of carbon dioxide in the air increases, the temperature rises rapidly when exposed to sunlight. It shows that carbon dioxide has the function of thermal insulation.

Not feasible because the cost is too high and the absorption of calcium hydroxide is not as good as sodium hydroxide. The red liquid of the U-shaped tube in A is equal, and the red liquid of the U-shaped tube in B is high on the left and low on the right; Conclusion: CO2 and O2 form CO at high temperatures, and people inhaling CO in large quantities will affect their health.

But why isn't CO2 dissolved in water?

The reduced mass is the mass of O2.

1.That is, oxygen is generated.

2.After the full reaction, there must be KCl and mNO22KCLO3=mNO2=2KCl+3O2 X

The solution is x= i.e., the remaining kcl is and mno2 is.

The mass ratio is kcl:mno2=:15

cuo+h2=cu+h2o

The reduced mass of the solid is the mass of the O element in the cuo.

Reduced is.

The mass fraction of O in cuo is 16 (16+64) = so the mass of cuo is.

It turns out that the quality of the CU is.

Maybe the equation numbers are not aligned, just understand it yourself.

KCLO3 = 2KCl + 3O2 (MnO2 catalysis) Obviously, the amount of reduction is the O2 generated, so the generation of oxygen, and, and KCL, the mass is calculated by yourself!

2、cuo+h2=cu+h2o

The reduction is o, and, and the rest is cu.

1.The less mass is the mass of oxygen, i.e., potassium chloride and manganese dioxide.

1 na2o2 na naoh na2co3 nahco3

2 The mass of oxygen is so sodium peroxide is mol, so the mass is so sodium oxide has mol solute is NaOH Na element has a total of mol, so NaOH has a dose of the source concentration is attacked.

The valency of Ca is +2 valence, the valency of O is -2 valence, and the total valency is zero, i.e., (+2) + (valency of W) + (2*4) = 0, so the valency of W is +6Valency formula:

Monovalent potassium hydrochloride, sodium silver, divalent oxygen, calcium barium, magnesium zinc.

Trialuminum, tetrasilicon, pentavalent phosphorus, di-triiron, ditetracarbon.

246 sulfur is complete, copper mercury bivalent is the most common, don't forget the elemental is 0

Acid root formula: monovalent hydroxide, nitroammonia;

divalent sulfuric acid, carbonate;

Trivalent phosphorus should be remembered!

Calcium is +2 valence and oxygen is -2 valence so w is +6 valence.

Valency in calcium tungstate.

ca +2 w +6 o -2

Potassium permanganate is heated to produce oxygen.

Heating (1) Verbal expression: potassium permanganate——— potassium manganate + manganese dioxide + oxygen (2) manganese dioxide (mnO2).

Hydrogen peroxide – water + oxygen.

3) Ignite.

Charcoal + oxygen ——— carbon dioxide.

As for the comparison, I don't know what you're referring to, so I can't help you, I'm sorry.

(1) Potassium permanganate——— potassium manganate + manganese dioxide + oxygen (2) manganese dioxide.

Hydrogen peroxide – water + oxygen.

3) Ignite.

Charcoal + oxygen ——— carbon dioxide.

Compare; The first 2 reactions are made from one reactant to produce multiple (2 or more) products, which are about to be studied (decomposition reactions).

The final reaction is a product from 2 or more reactants ,,, the chemical reaction to be learned.