Take a look at chemistry, is there a chemical god kneeling and begging

The mass fraction of oxygen is 100% oxygen, 50% sulfur dioxide, carbon dioxide, and 0 hydrogen, so the composition may be: 1. sulfur dioxide; 2. Oxygen, sulfur dioxide, hydrogen; 3. Sulfur dioxide, carbon dioxide, hydrogen; 4. Oxygen and hydrogen; 5. Carbon dioxide, hydrogen; 6. Oxygen, sulfur dioxide, hydrogen, carbon dioxide.

The mass fraction of oxygen in oxygen is 100%, the mass fraction of oxygen in sulfur dioxide is 50%, the mass fraction of oxygen in carbon dioxide is 50%, the mass fraction of oxygen in hydrogen is 0, and the mass fraction of oxygen in this gas is 50%, so the air composition may be 1 sulfur dioxide 2 carbon dioxide + hydrogen 3 sulfur dioxide + carbon dioxide + hydrogen.

The mass fractions of oxygen in oxygen, sulfur dioxide, carbon dioxide, and hydrogen are:

Oxygen 100, sulfur dioxide: 32 64 100 50% carbon dioxide: 32 44 100

Hydrogen 0% mass fraction is 50%:

1. A gas: sulfur dioxide.

2. Two gases: carbon dioxide, hydrogen or oxygen, hydrogen.

3. Three gases: carbon dioxide, sulfur dioxide, hydrogen or oxygen, sulfur dioxide, hydrogen.

4. Four gases: oxygen, sulfur dioxide, carbon dioxide, hydrogen.

The first is sulfur dioxide, a substance.

The second is hydrogen and carbon dioxide.

The third type is oxygen and hydrogen.

The fourth type of oxygen sulfur dioxide is hydrogen.

Method. Oxygen: 100% > 50% sulfur dioxide: 50% = 50% of oxygen

The carbon dioxide:oxygen element fraction is about 73%.

The hydrogen:oxygen element fraction is about 0%.

If it is a substance, it must be equal to 50%.

If there are two or more of them, there must be one greater than 50% and less than 50%.

1。Pure SO2

2, a mixture of O2 and H2.

H2 mixture.

Mixture of H2, SO2.

Mixture of H2, SO2.

6。The topic provides a mixture of all gases.

Oxygen, sulfur dioxide, carbon dioxide, hydrogen.

Oxygen, sulfur dioxide, hydrogen.

Sulfur dioxide, carbon dioxide, hydrogen.

Oxygen, carbon dioxide, hydrogen.

Sulfur dioxide, carbon dioxide, hydrogen.

Chiral carbon atom refers to a carbon atom that is connected to four distinct atoms or groups, and four different ones must be connected, as shown in the figure below.

It's just an organic.

First: the origin of chemistry.

Chemistry is a science that studies the composition, properties, structure, and relationship between matter and energy. The word chemistry comes from the ancient Greek word "chemeia", which originally referred to alchemy, meaning "the art of transforming impure matter into pure matter".

Alchemy is one of the predecessors of the discipline of chemistry, which originated in ancient Egypt, Babylon, India, etc., and was developed during the ancient Greek and Roman periods. Through experimentation and trial and error, alchemists try to convert ordinary metals into ***, seek elixirs of immortality, and so on. Although many of the alchemists' experiments and practices now seem wrong, their study of matter and change laid the foundation for the discipline of chemistry.

During the scientific revolution in Europe in the 17th century, chemistry was separated from philosophy and formed an independent discipline. At that time, some famous scientists, such as Robert Boyi, Joseph Priestley and others, through experiments and observations, clarified the basic laws of the composition and properties of matter, and promoted the development of chemistry. With the continuous innovation of chemical technology and experimental methods, chemistry has gradually become an important natural science, and is widely used in medicine, materials science, energy, environment and other fields.

Second: the use of chemistry.

As a natural science, chemistry studies the basic scientific principles and technical applications of the composition, structure, properties and changes of matter, and has an important impact on the development of human society and all aspects of life. Here are some of the main application areas and uses of chemistry:

1.Pharmaceutical and life sciences: Chemical technology plays an important role in pharmaceutical research and life science research, including drug synthesis, efficacy evaluation, molecular biology, genetic engineering, etc.

2.Materials Science and Engineering: Chemical technology has a wide range of applications in the synthesis, modification, processing, surface treatment, and analytical testing of materials, including plastics, rubber, fibers, glass, ceramics, metals, and other materials.

3.Energy and environment: Chemical technology also has important applications in the development and utilization of energy, environmental protection and pollution control, including fossil energy, renewable energy, clean energy, pollution control and waste treatment.

4.Agriculture and food industry: Chemical technology is also widely used in agricultural production and food processing, including fertilizers, pesticides, biotechnology, food additives, etc.

5.Basic research and education: Chemical technology is also the foundation and key to promoting the development of basic research and higher education, and promotes the continuous progress and innovation of science and technology through theoretical research and experimental exploration.

Therefore, chemistry has a wide range of applications and an important position in modern society, and is an indispensable discipline.

Chemistry is an ancient science that originated from human exploration of the composition and properties of matter in nature. As early as the ancient Greek period, people began to study the nature and changes of matter and record them, and tried to separate and combine them in different ways. In this process, people gradually form the basic concepts and theories of chemistry, such as elements, compounds, molecules, reactions, etc.

With the development of science and technology and the advent of the industrial revolution, the application scope of chemistry has gradually expanded and has become an important applied science, including pharmaceutical, material science, biotechnology and other fields. Today, chemistry has become an indispensable part of science, providing us with powerful tools and methods to solve various practical bonding problems.

In this question, I feel that the quality of the alloy is a bit problematic, but the second question does not use this condition, let no2 xmol no ymol x+y= ( cu mmol ag nmol

Conservation of electron gain and loss 2m+n=3x+y= why= Because the last ones produced are copper nitrate and silver nitrate 2m+n= so x= y=

1) The amount of the reduced Hno3 substance is mol, the total amount of Hno3 is mol, and the combination with copper and silver is mol, let the alloy contain copper xmol, silver ymol: 64x+108y= 2x+y= solution x= y= they lose electrons in total, let the gas contain no2 amol, no bmol: a+b= a+3b= solution a= b= so:

2) Gas in the product: NO2; no 。

3) The mass of ag in the alloy is grams.

The easiest way:

Let the quantities of carbon monoxide and carbon dioxide be x and y, respectively, and the system of equations:

28x+44y=36

x+y=1 is calculated as x=y=

Then it's easy to calculate. Carbon monoxide and carbon dioxide each, carbon monoxide mass 14g, carbon dioxide molecule number.

The cross method is used to obtain v(co):v(co2)=1:1

The amount of total matter is 1mol so m(co)=14g v(co)= CO2 numerator number is.

At first glance, this is a person who does not read seriously.

The volume of carbon monoxide is, the mass is 14g, and the number of carbon dioxide molecules is.

Let the mass of carbon monoxide and carbon dioxide be x and y grams, then there is x+y=15

x 28 + y 44 = solution.

The amount of a substance with x=y=c0 is.

The amount of CO2 is.

The answer is wrong, but the way is right.