Chemistry questions in junior high school advanced to masters!! ）

1 There is a gap between the molecules The molecules themselves do not change.

2 It's just a change in the position of an atom that is a physical change.

3 1 The intermolecular distance becomes smaller.

2 There is a gap between molecules.

3 Molecules are spreading.

4 Molecules are diffusing Molecules are constantly moving.

5 Molecules are particles that maintain the chemical properties of a substance.

4 1 Molecules are diffusing Molecules are constantly moving.

2 Temperature: Polymer movement accelerates.

3 The distance between molecules varies with temperature The lower the temperature, the smaller the distance.

5 1 Molecules are in constant motion and will spread out.

2. The pressure increases, the intermolecular distance decreases, and the volume decreases.

, there is a gap.

2.Just move the atoms, the physics changes. Choose A

1）.There are intermolecular compartments.

2) The molecules are in constant motion.

3) The molecules are in constant motion.

4) The molecules are in constant motion.

5) The molecules are the same, the chemical properties are the same.

1) The molecules are in constant motion.

2) Molecules are constantly moving, and the higher the temperature, the faster the movement.

3) The gaps between molecules are different.

1) The molecules are in constant motion.

2.There are intermolecular compartments.

3.(1) There is a gap between molecules.

2) Molecules are diffusion.

3) The molecules are in constant motion.

4) The molecules are in constant motion.

5) In the mixture, the molecules maintain the chemical properties of the substance.

4.(1) Molecules are moving.

2) The higher the temperature, the faster the molecules move.

3) The gaps between molecules are different.

5.(1) Because the elements are in constant motion.

2) There are gaps between molecules.

There is a gap between CA molecules.

The molecules are in constant motion.

The molecules are in constant motion.

The molecules are in constant motion.

Molecules are particles that maintain the chemical properties of a substance.

The molecules are in constant motion.

Molecules are constantly moving, and the higher the temperature, the faster the movement.

The distance between the molecules is different.

There is a gap between CA molecules.

The molecules are in constant motion.

Molecules diffuse in the air.

The molecules are in constant motion.

The molecules are in constant motion.

A molecule is the smallest particle that maintains the chemical properties of a substance.

The higher the temperature, the faster the molecules move.

The intermolecular spacing is different.

The molecules are in constant motion.

Gas molecules are widely spaced and are easily compressed.

3.There is a gap between molecules, molecules are in constant motion, molecules are in constant motion, molecules are in constant motion.

The same molecular properties are the same.

4.When the temperature of the molecule is high, the molecular motion is more intense, which is affected by the temperature and the nature of the molecule.

5.Molecules are constantly moving and there are gaps between molecules.

3.(1) There is a gap between molecules, (2) There is a gap between molecules, (3) Molecules are in constant motion, (4) Molecules are in constant motion, and (5) Molecules are particles that maintain the chemical properties of substances.

4.(1) Molecules are in constant motion, (2) The motion of molecules is related to temperature, and (3) because the spacing between molecules is different.

5.(1) Because molecules are in constant motion, (2) there are gaps between molecules.

Because the amount of the same substance is nmolch4 nmolar h2 nmolar conmolar o2

That's 2NC 6NH 3NO

The amount of elemental matter before and after the reaction is conserved.

So the ratio is still 2:6:3

The solute contained in the original solution is x (85 is one-fifth of 425), then (85+40+25) :(25+:x

The mass fraction of the solution in the x=25 saturated solution is 25 125*100%=20%.

Pure substance a: water: total mass of solution = 5:8; 13 When the total mass of the solution is 100g, the pure substance a is.

That is, the quality score is.

As above over

m(s) = 400 * 1% = 4kg

m(so2) = 4 * 64 / 32 = 8kg

About 8 kg of sulfur dioxide is emitted from the atmosphere.

One percent of the sulfur content is 4 kilograms.

s---so2

4kg xx= 12kg.

That's probably it, I hope it helps.

8kg Analysis:

Mass fraction of sulfur in sulfur dioxide = 32 64 =;

The mass of sulfur in coal = 400 * 1% = 4kg;

Because "all the sulfur elements in it are converted into sulfur dioxide", there is a sulfur dioxide mass = 4

Boss, you can't do such a simple question, it's incredible, 400kg contains 1% is 4kg, and the mass fraction of sulfur dioxide in sulfur dioxide is 50%, so the mass of sulfur dioxide is naturally 8kg, give it to me.

Because the S content is 1%, that is, the S is 4kg

s+o2=so2

4 x when 8kg

Solution: Since the amount of sulfuric acid is sufficient, zinc is directly considered.

Suppose: Hydrogen is produced x g.

By: zn h2so4 znso4 + h2 (remember the arrow) 65 2

x g: 65 x

A: ——

It is known that the relative molecular weight of dilute HCl HCl is the relative molecular weight because it happens to be a complete reaction.

Therefore, the solute in the solution is all NaCl, and the amount of Cl ions is calculated first: (

Then count the quality of NACL.

Let the mass of NaOH be 40x and the mass of Na2CO3 be 106Y, according to the equation NaOH+HCl=NaCl+H2O and Na2CO3+2HCl=H2O+CO2 +2NaCl

40x 106y

The mass of the HCl solute is .

The system of equations 40x+106y=

Calculate the values of x,y, and calculate the mass of NaCl in the substitution equation to obtain the mass of the solute.

The mass of the solvent is the mass of the original solid mixture + the mass of dilute hydrochloric acid - the mass of CO2, and then the solute mass divided by the solvent mass.

The final solution of HCl, NaOH+HCl=NaCl+H2ONa2CO3+2HCl=2NaCl+CO2+H2O is NaCl, that is to say, all Cl atoms in HCl are combined with Na atoms, so the mass of NaCl can be solved by the mass of HCl.

hcl nacl

So, there is no level in this question, you should ask what the quality score is...

Atoms are conserved, and this question cannot be calculated blindly. (I went to high school question).

Not anymore, I haven't written it for a long time.

This question is so simple that it takes a bit of effort to write on it, and I'm embarrassed.