Does a chemical change necessarily include a physical change?

It is not included, but it must be accompanied, because when an atom is reconstituted into another molecule, it must be accompanied by a change in energy, which is not a simple chemical change or a physical change, but it is generally regarded as a physical change.

Yes, but physical changes do not necessarily include chemical changes at the same time.

Chemical change: When a change occurs, other substances are formed, and this change is called a chemical change.

Physical Changes: No changes in the formation of other matter.

Definitely. The chemical change must be accompanied by an energy change, and since there is an energy change, at least the temperature will change when the chemical change occurs, that is, the physical change.

There must be no chemical change in the physical change.

Physical changes, chemical changes occur at the same time and end at the same time.

Wrong. Natural gas is used as fuel.

It is determined by chemical properties, but it also has physical properties.

Not necessarily, a chemical change is not necessarily a physical change, and a physical change is not necessarily a chemical change! The essential difference is whether new substances are produced in the process of change.

We've just learned! So know a little better!

Yes, chemical changes include physical changes as well.

However, physical changes do not necessarily include chemical changes at the same time

Chemical changes must be accompanied by physical changes.

Physical changes must not"Accompaniment"Chemical changes.

There must be no physical change when a single physical change occurs.

Physical changes include density, pressure, mass, state, etc.

Definitely, not the other way around! It is in the textbook of the third grade of junior high school.

Doesn't physical change refer to a change in three states? There is no three-state change in the production of carbon dioxide by adding oxygen to carbon monoxide, which should not be considered a physical change.

The first thing to understand is the meaning of physical change and chemical change.

1. The basic three-state change of matter, and no new substance is produced, so it belongs to physical change. Deliquescence of inorganic salts and alkalis such as NAOH, melting of ice, crushing of bile alum, etc. The special ones are:

The transformation of graphite into diamond under certain conditions is a chemical change because it becomes another element.

2. The process of conversion or transfer of atoms or electrons between molecules in contact with each other to generate new molecules accompanied by energy changes; The chemical change is essentially the breaking of the old bond and the formation of a new bond. The process of chemical change is often accompanied by physical change. In the process of chemical change, there are usually luminescence, exothermia, and endothermy.

If there is a chemical change, it means that the old substance has disappeared and the new substance has been formed. In this process, it is generally accompanied by one or more of the electrical, thermal, acoustic and optical effects, such as the heat of chemical reaction, the transport of charged particles, etc. At the same time, the physical properties of the new substance are generally different from those of the original substance, such as specific heat, density, conductivity, etc.

So, the physical change must be there.

1. Different characteristics: in chemical changes, some new substances will be generated, while in physical changes, the shape of substances may change, but other substances will not be generated.

2. Different changes: In the chemical and distribution changes, the reaction of non-Peisen Hutong will occur after the molecules come into contact with each other, and the molecules will be produced in the new year. Whereas, in physical change, neither the distance between the atoms nor the molecules themselves produce changes.

The essential difference between the two is the presence or absence of new substances. Physical changes are only changes in form, properties, etc., while chemical changes are new substances are generated. Physical Change Examples:

Smell of wine, wet clothes dry. Examples of chemical changes: photosynthesis in plants, rusting of iron in humid air.

Chemical changes. Chemical change refers to the process of conversion or transfer of atoms or electrons between molecules in contact with each other to form new molecules accompanied by changes in energy, which is essentially the breaking of old bonds and the formation of new bonds.

Chemical changes are always accompanied by physical changes. In the process of chemical change, there are usually luminescence, exothermia, and endothermy. According to the atomic collision theory, the chemical change between molecules is accomplished through collision, and two conditions need to be met to complete the collision of the molecule that reacts

1. Have enough energy; 2. Correct orientation.

Chemical change and physical change are two different phenomena that describe different types of change, respectively. Physical change rocks refer to changes in the shape, color, density, phase and other aspects of a substance, while chemical change refers to a change in the chemical properties of a substance, usually involving a recombination between atoms or molecules.

Physical changes usually only change the appearance and properties of matter, not its essence. For example, changing water from a liquid state to a gaseous state is a physical change because the nature of the water molecules does not change, only the interactions between them. Another example is heating iron to a high temperature to make it softer, which is also a physical change.

In contrast, chemical changes cause a change in the nature of matter. In a chemical reaction, the bonds between atoms or molecules are broken and recombined to form new molecules or compounds. These new molecules or compounds have different physical and chemical properties, so chemical changes can change the color, shape, and density of a substance, and are often accompanied by the release or absorption of energy.

For example, when iron reacts with oxygen, it forms iron oxides and releases energy. This is a chemical change because the bonds between iron and oxygen are broken and recombined to form a new molecule – iron oxide. Iron oxide has physical and chemical properties that are different from iron or oxygen, so it is a chemical change.

In conclusion, chemical change and physical change are two different types of change. Physical change can only change the appearance and properties of matter, not its essence; Whereas, chemical changes cause a change in the nature of matter, and are usually accompanied by the release or absorption of energy.

The difference between a chemical change and a physical change is whether or not a new substance is generated.

The biggest difference between physical change and chemical change is that physical change does not produce new substances, while chemical changes produce new substances. The connection between the two is that chemical changes must contain physical changes, and there must be no chemical changes in physical changes. "Formation of other substances" is the only basis for judging chemical changes.

The phenomena accompanying the change process, such as luminescence, heat release, color change, etc., only play a certain auxiliary role and cannot be used as the basis for judging chemical changes.

For example, ice, liquid water, and water vapor are three state changes of the same substance, and the water itself does not become other substances in the process of change, which is a physical change. There are three common forms of physical change: 1. State change (change of solid, liquid and gas); 2. Change of shape; 3. A change in a certain form of energy (such as changing the temperature of a substance in the form of conduction, convection, and radiation in physics).

For example, when an electric light is energized and emitted heat in a classroom, electrical energy is converted into light energy and heat energy, which is a physical change. The light bulb in the flashlight is converted into electrical energy and then into light energy in the battery, which is a chemical change.

Chemical changes.

Chemical change refers to the process of conversion or transfer of atoms or electrons between molecules in contact with each other to form new molecules accompanied by changes in energy, which is essentially the breaking of old bonds and the formation of new bonds.

Chemical changes are always accompanied by physical changes. In the process of chemical change, there are usually luminescence, exothermia, and endothermy. According to the atomic collision theory, the chemical change between molecules is accomplished through collision, and two conditions need to be met to complete the collision of the molecule that reacts

1. Have enough energy; 2. Correct orientation.

Examples of physical changes: water evaporates and solidifies, sugar cubes melt, carbon dioxide condenses into dry ice, wine smells, wet clothes dry out. Examples of chemical changes:

Sodium hydroxide deterioration, plant photosynthesis, hydrochloric acid rust removal, basic copper carbonate thermal decomposition, iron rusting in moist air, candle burning.