A chemistry problem that needs help urgently!!

In molecules, atoms, protons, neutrons, electrons, nuclei of these particles:

The particles that can directly make up matter are molecules, atoms.

Particles that can maintain the chemical properties of substances include molecules and atoms (substances made of atoms have their chemical properties maintained by atoms).

The particles that show electrically neutral are molecules, atoms, neutrons. Positively charged particles are protons, nuclei. Negatively charged particles have electrons.

The particle with the smallest mass is the electron.

When participating in a chemical reaction, there are molecules of particles that must change.

The number of nuclear charges, protons, and electrons of atoms that are equal in the same atom is equal.

The mass approximately equal to the mass of the hydrogen atom is the proton.

Molecule atoms.

Atom. Neutrons are atomic molecules.

Son of the nucleus.

Electron. Electron.

Molecule (uncertain).

Proton electrons.

Proton nucleus of a hydrogen atom.

Atoms and molecules.

Atoms and molecules.

Neutron atom.

Protons are nucleus.

Electron. Electron.

Molecule. Protons and electrons.

Protons and neutrons.

The particles that can directly make up matter are molecules, atoms.

The particles that can maintain the chemical properties of matter are: molecules, atoms.

The particles that show electrically neutral are molecules, atoms, neutrons.

Positively charged particles are protons, nuclei.

Negatively charged particles have electrons.

The particle with the smallest mass is the electron.

When participating in a chemical reaction, the particles that must change are: electrons.

In the same atom are equal in number: protons, electrons.

The mass approximately equal to the mass of the hydrogen atom is: neutrons.

First, it is necessary to study the chemical reaction principle of the laboratory preparation method, that is, to study what drugs can be used and what reactions can be used to prepare this gas under laboratory conditions (such as room temperature, heating, catalyst, etc.); second, it is necessary to study the experimental apparatus that should be used to produce this gas; Third, it is necessary to study how to verify that the prepared gas is the gas to be produced. Below, we will use the learning ideas and methods summarized above to discuss the laboratory preparation method of carbon dioxide.

The ideas and methods of gas laboratory preparation are briefly summarized as follows: first, it is necessary to study the chemical reaction principle of gas laboratory preparation method; second, it is necessary to study the experimental apparatus that should be used to produce gas; Third, it is necessary to study how to verify that the prepared gas is the gas to be produced.

2cao2+2h2o=2ca（oh）2+o2

2Na2O2+2H2O=4NaOH+O2 can not be added to the fish pond water with sodium peroxide, which is too alkaline.

Question input incorrect: It should be"Its atom contains a number of electrons inside"

From the question, the relative atomic mass of the carbon atom is 6+6=12, so the carbon atom is carbon dodeca.

So the relative atomic mass of atom a is n*12 m

Because the number of protons in an atom is equal to the number of electrons.

So the number of protons is equal to a, and the number of neutrons is equal to n*12 m-a

By definition (don't ask me what the definition is), the mass number of this atom is 12n m (rounded), and generally its number of protons is equal to the number of neutrons equal to half of the number of masses.

2h2o2=2h2o+o2

68...32x ..

x Quality Score: (

Protein: CA) 110mg*486ml 500ml Black is iron oxide.

Plugging the tube with a rubber stopper prevents FEO from being oxidized.

The speed of the chemical reaction is directly proportional to the surface area of the reactants, that is, the larger the surface area, the faster the rate FeC2O4=FeO+Co+CO2 (conditional heating).

grams of oxygen are.

2h2o2=2h20+o2

So there is hydrogen peroxide.

is the mass fraction of the solute in the solution.

grams of oxygen are.

2h2o2=2h20+o2

So some hydrogen peroxide is.

2h2o2=2h2o+o2

x so x (

W(Ca) 110mg*486ml 500ml multiplied by ten negative cubic black is iron oxide, plugging the test tube with a rubber stopper is to prevent FeO from being oxidized The speed of the chemical reaction is proportional to the surface area of the reactant, that is, the larger the surface area, the faster the rate FeC2O4=FeO+Co+CO2

1. I don't know because there is no diagram, but you can judge it according to the contour value and density on the graph;

2. Because there is no map, I guess it should be the vertical zonality that changes with altitude, the main reason is that the altitude is different, and the temperature is different;

3, it should be Beihe: wheat; Nanhe: Rice.

3.Wheat, longitude and latitude differences.