Chemistry concept. Rush 11111111111

1.The number of particles refers to the number of individual molecules of matter.

2.The number of particles of oxygen is the number of oxygen molecules.

The number of particles of oxygen is the number of molecules of oxygen, and here you must not think that it will be the number of oxygen atoms. Because the question asks you about the number of particles of oxygen. If you were asked what is the number of oxygen atoms in 1 mol of oxygen, the answer would be 2 mol

Particles include molecules, atoms, ions, electrons, neutrons, protons, etc. The number of particles of oxygen is the number of oxygen molecules.

1.The number of particles is the number of certain particles, which include molecules, atoms, ions, electrons, neutrons, protons, etc.

2.Generally, you don't ask like this, only how many mol molecules are in how many grams of oxygen are in it (which particle is indicated).

lz, the answer is b

a. Rust is Fe2O3, commonly known as iron red, reddish-brown powder, b, iron hydroxide, reddish-brown precipitate.

cFerric oxide is a black crystal with magnetic properties.

d. Ferric chloride solution yellow.

A. Rust, that is, Fe2O3, is reddish-brown.

B, Fe(OH)3, reddish-brown precipitate.

C, Fe3O4, black.

D. FeCl3 solution, yellow.

One. 1、ba（oh)2 2、khso4 3、hno3 4、na2co3

According to acid, minus, salt, where the acid is (3), the subtraction is (1), and the salt is (24).

2. Use a reagent to remove impurities (impurities in parentheses) and write the ion equation with a reagent.

1）bacl2(hci) ba(oh)2 h+ +oh-=h2o

2) CO2(HCI) NaHCO3 solution saturated H+ +HCO3-=H2O+CO2

3) O2(CO2) NaOH solution CO2+2OH-=CO32-+H2O

4) SO4 - (CO3 - dilute sulfuric acid H+ +HCO3 - = H2O+CO2

Among them, those that belong to acids are (3), those that belong to minus are (1), and those that belong to salts ( ).

1) BaCl2 (HCI) plus an appropriate amount of barium hydroxide (2) CO2 (HCI) into sodium bicarbonate solution (3) O2 (CO2) into sodium hydroxide solution (4) SO4 - (CO3 - plus sulfuric acid).

Hello, the sour is (3), which belongs to the minus (1), salt (2, 4).

BaCl2 (HCI) is barium hydroxide, (2) CO2 (HCI) is sodium bicarbonate solution, (3) O2 (CO2) sodium peroxide.

4) SO4 -(CO3 - Use sulfuric acid solution, you can do it, hehe, the ion equation is very simple, you should be able to do it, you can use it, you can use sulfuric acid solution

To put it simply, to learn chemistry well, you must do the following:

First, pay attention to and do a good job in chemical experiments.

Second, be familiar with the composition and properties of important substances, know how to use chemical terms, and understand basic chemical concepts and laws.

Third: Understand the application of the knowledge of chemistry in life and societyFourth: pay attention to cultivating and maintaining interest in learning chemistry, and pay attention to cultivating the ability of observation, memory, thinking, experiment, self-study, etc.

Colourless. Lack of qi clear socks.

Liquid oxygen. There is a certain solubility in water to reach the dissolution equilibrium.

Combustion-fueling (Note: not combustible!) Positive and false.

Binding to hemoglobin exhalation.

Acid oxide is an oxide that reacts with alkali to form salt and water, generally non-metal oxide, but Mn2O7 is the acid anhydride of permanganic acid, which is an acidic oxide; Basic oxides are oxides that react with acids to form salts and water, all of which are metal oxides. Acidic oxides, basic oxides and amphoteric oxides are salt-forming oxides because they can react with acids or bases to form salts. Non-salt oxides are commonly known as CO and NO.

Metal oxides can be basic oxides (e.g., Na2O), acidic oxides (e.g., Mn2O7), or amphoteric oxides (e.g., Al2O3).

Non-metallic oxides can be acidic oxides (e.g., SO2) or non-salted oxides (e.g., CO).

Acid oxides are a class of oxides that can react with water to form acids or alkalis to form salts and water, but generally do not react with normal salts or acid salts. For example, sulfur trioxide SO3, phosphorus pentoxide P2O5, manganese heptaoxide Mn2O7, chromium trioxide CRO3, etc. Most of the non-metal oxides are acidic oxides.

Oxides that can react with acids to form salts and water are called basic oxides. Basic oxides must be metal oxides, while metal oxides are not necessarily basic oxides, such as Mn2O7 is an acidic oxide, Al2O3, BEO, Cr2O3, Zno, and Mno2 are amphoteric oxides.

Oxides that cannot react with acids and bases to form salts and water are called non-salt oxides. For example, H2O, NO, CO, N2O, NO2, N2O4, Teo, ClO2, and I2O4 are non-salt oxides.

1.The reaction to generate Mg2Si is a synthesis reaction, after the reaction, the valency of Mg is +2, the valency of silicon is -4, 1mol of Mg2Si has 1mol of Si-4 ions, so the number of electrons transferred is 4mol.

, Hg decreases from +2 to 0 valence, S increases from -2 to +4 valence (liter 6), and O decreases from 0 valence to -2, so only the S element increases, so 1 SO2 molecule is generated, and the number of electrons transferred is 6.

3.For every 1 mol of Hg generated, 1 mol of SO2 is generated, so the number of electrons transferred is 6 mol.

To solve this kind of problem, of course, it is easiest to look at only one element, so generally we find those with increased valence or decreased valency, see how many elements there are, and then look at the part with fewer elements (such as the s element in 2 and 3, only it is raised). If you have any questions, you can ask them again!