Ask for a simple chemistry problem!! Solve a few chemistry problems!!

I asked the other day, and I'll try, and you're wrong, and it's every 100 molecules of water.

The answer is definitely B

Sodium reacts with water to give sodium hydroxide.

There is sodium and eventually sodium hydroxide is obtained, which is sodium ions.

To make every 100 water molecules contain 1 sodium ion, the amount of water in the solution is 10mol and 180 grams.

But the reaction to consume the water is grams.

A total of grams are added.

Sodium, that is.

2na+2h2o=2naoh+h2

Reactions occur, so the quality of the water required for the reaction needs to be taken into account.

The mass of the water reacted is, ie.

So pick B I think the answer should be, if you follow the answer you provided, then the question should be one sodium ion per 100 water molecules).

To make each water molecule contain 1 sodium ion"It shows that the ratio of sodium to water is one to one, so the end result is that there are mol of sodium ions and water molecules, but for sodium to react with water to form sodium hydroxide, sodium must first consume water, so the total amount of water is grams.

Is there a problem with the question, is there such a concentrated sodium hydroxide solution?

1.Select b to heat ammonium chloride.

The molecule is broken down into HCl, NH3

Broken ionic bonds.

Electrolysis of water, water is decomposed into H2, O2

Broken covalent bonds.

Hydrogen bromide dissolves in water to form br-

H+ breaks the covalent bond.

2.From. A has 8 more protons in the nucleus than B.

It is said that Bi Ming is an element of the same family. And the same family, and there are 4 nuclei, can form atomic clusters of ions with each other, you have to think of it immediately.

Sulfite. so3

2-。Then calculate the total number of electrons in the manuscript: S has 16 electrons + O has 3*8 + 2 electrons with = 42 electrons.

So (1)a can be launched

is sulfur S and B is oxygen O

2) Sulfite. so3

3) The boiling point H2S is less than H2O, because the H2O molecule contains H bonds, which are much stronger than the intermolecular forces, and the molecules are close together, so the H2O boiling point.

High. 4）na2so3

There are ionic bonds, covalent bonds.

1,b。Iodine sublimation, destroying intermolecular forces.

2.Suppose the number of protons of the b atom is x, and the chemical formula of the anion is .

ab3^2-

42=2+8+x+3x

Solution. x=8

Then b is o and a is s

1.The name of the element a, sulfur, b, oxygen;

2) The ionic symbol of this anion is SO32-

3.The boiling point of hydrides of A, B, H2O>H2S

The reason is that in addition to the intermolecular forces, there are stronger hydrogen bonds between the water molecules in the water.

4.The chemical bonds contained in the compound formed by the anion and sodium ion are ionic bonds, polar covalent bonds, etc.

b.Solid iodine sublimation.

aBreak ionic bonds.

CD breaks the covalent bonds.

The negative divalent anion contains 4 nuclei of considered sulfite, and the empirical liter simulation satisfies the number of protons in the nucleus of 42 electrons and the number of protons in the nucleus of a is 8 more than that of b

A is sulfur and B is oxygen.

so3）2-

Hydrogen sulfide is a gas.

The boiling point of water is 100 degrees.

The compound is Na2SO3 and contains ionic bonds and polar covalent bonds.

The mass of the mixture of Mg and Fe powder minus hydrogen is equal to the increase in the mass of the solution.

m(h2)= n(h2)=

h2so4---h2

x column shows the solution x=

Idea: According to the mass difference between the mass of the metal mixture and the hydrogen, that is, the weight gain value of the solution, the mass of hydrogen produced by the reaction can be known, and then the relationship between the amount of sulfate and hydrogen can be known according to the equation of the reaction between the two and dilute sulfuric acid.

Analysis: According to the difference between the mass of the metal mixture and the mass of hydrogen, that is, the weight gain value of the solution, it can be known

The mass of hydrogen produced by this reaction is, so the amount of hydrogen is as:;

Since the reaction equation between the two and sulfuric acid is mg+h2so4 mgso4+h2 and fe+h2so4 feso4+h2, it can be seen that the amount of hydrogen is equal to the amount of sulfate substance, so the sum of the amount of sulfate substances formed in the reaction is.

A total of 8g of Mg and Fe powder mixture of dilute sulfuric acid was added, but the mass of the solution only increased, and it was known that grams of hydrogen gas were generated, that is, hydrogen.

Write the equation for the reaction of Mg, Fe and sulfuric acid.

mg+h2so4→mgso4+h2↑

fe+h2so4→feso4+h2↑

It can be seen that for every 1 mol of hydrogen produced, 1 mol of sulfate is generated. Then the generation of hydrogen produces sulfate.

Very simply, hydrogen, transfer electrons, fe mg dissolved sulfuric acid, are divalent ions, 1:1 reaction, sulfate.