I m anxious about a chemistry problem. A chemical problem.

Calculated according to the equation.

s+ o2=so2

The amount of matter 1 1

Then x m na

x= m/na

So the number of oxygen atoms participating in the reaction is 2 (m na) na=2m, so a does not know how to ask.

The number of oxygen atoms participating in the reaction is the number of oxygen atoms in SO2, and an SO2 molecule contains two oxygen atoms, and when there are m SO2 molecules, the number of oxygen atoms participating in the chemical reaction is 2m.

Or from the chemical reaction S+O2=ignition = SO2, it can be seen that if M SO2 molecules are generated, the number of oxygen atoms in the product is 2m, according to the content of the law of conservation of mass: before and after the reaction, the mass, type, and number of atoms remain unchanged, then the number of oxygen atoms participating in the reaction is 2m

Choose a number of oxygen atoms = number of oxygen atoms, you can say, "the ratio of the number of oxygen atoms" and "the ratio of the number of oxygen atoms", they want to express exactly the same meaning, as if "there are 30 people in a class" and "there are 30 people in a class" both mean the same thing.

That teacher has a brain in water, don't listen to him, he got the oxygen molecule and the oxygen atom wrong, and the answer must be A

It's A, your teacher is wrong, O2 can't be said to be the number of oxygen atoms, so the meaning of oxygen atoms and oxygen atoms is the same.

56g of iron powder was put into 500g of dilute nitric acid, and the two happened to completely react to release NO, and the solution increased by 32g

56-32 = 24 grams, indicating that there are 24 grams of NO, the amount of its substance is 24 (28 + 16) = 24 44 = 6 11mol, the amount of iron reacting with nitric acid is also 6 11mol, the reason is Fe - NO), the amount of the remaining elemental iron substance is 1-6 11 = 5 11mol, there is a reaction Fe + 2Fe3 + = 2Fe2+, so the amount of ferrous ions is 10 11mol, so the amount of ferric iron.

The amount of ionic material is 1 11mol, and its concentration is not available, and the reason is unknown!

I choose CAThe decrease in the mass of alcohol due to volatilization is a physical change.

b.Sodium hydroxide reacts with carbon dioxide in the air to form sodium carbonate or sodium bicarbonate 2NaOH + CO2 = Na2CO3 + H2O or NaOH + CO2 = NaHCO3 with an increase in mass.

d.Calcium oxide reacts with water in the air to form mature lime calcium hydroxide, and can react with carbon dioxide to form calcium carbonate, and the quality increases.

cao+h2o=ca(oh)2，cao+co2=caco3

a. Volatilized and reduced.

b. It reacts with carbon dioxide and water in the air and gains weight.

c. Loss of crystal water, lightened, d, reaction with carbon dioxide and water, weight gain.

So choose C

The process of losing crystalline water is called weathering.

As for B, it is deliquescent, which is a physical property, and it will also react with CO2, which is a chemical change.

Yes, the quality will increase.

A is H, B is O, C is Na, and D is Cl

C2B2 is NA2O2 electronic type, let's write it by yourself.

The main ingredient of the disinfectant is naclo

(1) It was concluded that fresh chicken liver slices contain catalysts that can decompose H2O2.

2) The purpose of the first step experiment was to demonstrate that Mno2 can catalyze the decomposition of H2O and that the gas is produced due to H2O. Otherwise, if there are only 2 or 3, it is not certain whether this gas is produced from the chicken liver.

Hope it helps