How to distinguish between physical change and physical properties Chemical change and chemical prop

The essential difference between physical change and chemical change is whether there is a new substance or not, and the formation of a new substance is a chemical change, otherwise it is a physical change. The difficulty lies in the judgment of new substances, sometimes there are changes in heat, light, color, state, etc., but these are not the basis for judgment, we must find out whether there are new substances.

The properties that manifest themselves in chemical changes are chemical properties, otherwise they are physical properties.

Physical properties generally include: color, state, hardness, density, temperature with three state changes, electrical conductivity, ductility, magnetism, volatility, water absorption, etc.

The chemical properties generally are: oxidation, reduction, flammability, corrosiveness, etc.

The above learning in junior high school is almost enough, of course, there are some uncommon changes, which depend on the continuous accumulation and rich life knowledge to judge, I hope it will help you.

If there is combustion, it is generally a chemical reaction, and the chemical properties change the essence, but if the essence of the object does not change (such as water turning into ice) it is still a physical change. Or see if the elements have changed, and if they change, it is a chemical change. (C becomes co is a chemical change; The change of Ho to ice or steam is still a physical change).

My Note: Methods of Judgment of Nature and Change:

Bottom line: Only verbs change.

Can, will, is, can, easy, become (present) nature.

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Analysis: Physical Change: Macroscopic: No new matter produces auspiciousness. Microscopic: The molecule does not change (e.g., a wooden stick breaks).

Chemical Change: Macroscopic: New substances are produced. Microscopic: molecules break down and atoms recombine (e.g., carbon combustion to produce carbon dioxide).

Physical properties: The properties of an object that are not reflected by discursive changes, such as color, density, boiling point.

Chemical properties: properties reflected through chemical changes, such as flammability and oxidation of the branch.

In fact, it can be judged whether it is a physical or chemical property like this: for example, density, which can be calculated by mass and volume. The calculation does not produce new matter, so it is a physical property.

Another example is flammability. However, a new substance is chemically changed. So it's chemical. Complete.

Standard Answer (Selected from my chemistry notes in the third year of junior high school) Chemical properties: Properties of substances that manifest themselves in chemical changes Examples: Magnesium can burn, iron is easy to rust, carbon dioxide can discolor clarified lime water (Please note the bold word, which is different from the combustion of magnesium) Chemical changes:

There are changes in the formation of new substances, also known as chemical reactionsExample: Combustion of magnesium, rusting of iron Physical properties: Properties of substances that can be manifested without chemical changes such as:

Color, state, odor, melting point, boiling point, hardness, density, solubility, volatility, electrical conductivity, thermal conductivityPhysical change: no new substance is formedExamples: Tearing paper to shreds, gasoline volatilization, glass breaking, three-state change of water Connection between chemical change and physical change:

The process of chemical change inevitably undergoes physical change I hope it will be useful to you, and it is also a thank you to my junior high school chemistry teacher.

Physical and chemical changes:

Physical Changes: No changes in the formation of new matter. Such as light bulbs glowing, water vaporization, iron made of iron pots, balloons**, etc.;

Chemical change: There is a change in the formation of new substance. Such as paper burning, grain winemaking, gunpowder**, etc.;

The difference between physical change and chemical change: whether new substances are formed.

The connection between physical change and chemical change: when chemistry occurs, it must be accompanied by physical change, and when physical change occurs, there is not necessarily chemical change.

Physical and Chemical Properties:

Physical Properties: Properties that do not need to undergo chemical changes to manifest themselves. Such as color, state, odor, density, solubility, volatility, solubility, electrical conductivity, thermal conductivity, strength, hardness, ductility, elasticity, magnetism, etc.

Chemical properties: Properties that manifest themselves in chemical changes. Such as flammability, flammability, corrosiveness, toxicity, oxidation, reduction, acidity, alkaline, stability, activity, inertness, etc.;

Difference between physical properties and chemical properties: Physical properties can usually be revealed through external senses, while chemical properties can only be manifested through chemical reactions.

Difference Between Change and Nature:

There is a contrast between before and after the change, and the emphasis is on "change";

Properties are properties, characteristics of matter.

Usually when describing the nature, there are words such as "will", "easy", "can", etc.

1. Physical change: the substance changes from one state to another, and there is no change in the formation of new matter. (Molecules, atoms have not changed) such as:

Water freezes (liquid water becomes solid water), iron blocks are drawn into iron wires (shape changes), ore is crushed, iodine sublimation, etc. 2. Chemical change: the substance changes from one state to another, and there is a change in the formation of new substance.

Molecules and atoms have changed) such as: charcoal burned in oxygen to produce carbon dioxide (the original charcoal turned into carbon dioxide to generate new substances), steel rust, food rotten, etc., 3. The essential difference between physical change and chemical change: whether new substances are generated when changing.

4. The connection between physical change and chemical change: the process of chemical change must be accompanied by physical change 5. Precautions: Chemical change is often accompanied by luminescence, heat and other phenomena, but the changes caused by luminescence and heat generation are not necessarily chemical changes.

For example, the light bulb glows and heats up, which is a physical change. 1. Physical properties: The properties that can be exhibited without chemical changes are called physical properties.

Such as color, state, odor, melting point, boiling point, hardness, solubility, ductility, electrical conductivity, thermal conductivity, volatility, magnetism, etc. 2. Chemical properties: The properties of substances that are realized in chemical changes are called chemical properties: such as flammability, acidity and alkalinity, stability, etc.

3. The difference between physical (chemical) change and physical (chemical) properties: the change of matter is a process, and the properties of matter refer to the inherent properties of matter.

The difference between physical properties and chemical properties, the former is a property that does not need to be exhibited by chemical change, and the latter is a property that is exhibited when a chemical change occurs; The difference between physical change and chemical change is whether or not a new substance is formed.

Let's talk about the properties of matter first: it is the property of the substance itself, a substance has only one property under certain conditions, and the chemical property is the essence of the chemical reaction of the substance in the microscopic sense, for example, the material has oxidizing physical properties, which is some characteristics of the substance in the macroscopic sense, such as temperature, density, chemical change, is the process of chemical reaction of the substance, which is called chemical change, and the physical change is the macroscopic change of the substance, such as the decrease in mass ==

Properties are the original properties of matter, regardless of whether or not a reaction occurs;

Change is the transformation of matter, and if matter has no relevant properties, then the corresponding change cannot be performed.

It should be the nature that determines the change.

Physical properties are properties that can be exhibited by substances without chemical changes, such as color, state, odor, density, melting point, boiling point, hardness, solubility, ductility, electrical conductivity, thermal conductivity, etc., which can be sensed or measured by instruments.

Chemical properties are the properties of substances that exhibit in chemical changes. For example, the chemical properties of the substance category: acidic, alkaline, oxidizing, reducible, thermal stability and some other properties.

Chemical properties and chemical change are two different concepts, property is the property of matter, is the internal cause of change, and property determines change; The change is the specific manifestation of the property, and the chemical property can only be revealed in the chemical change.

For example, alcohol is flammable, so when you ignite it, the chemical change of alcohol combustion can occur; Whereas the flammability (chemical properties) of alcohol is a conclusion drawn through the phenomenon of countless alcohol burns.

Nature determines change, and change reflects nature.

Difference Between Chemical Change and Physical Change.

Whether there is a new substance generation is the essential difference between physical change and chemical change, in the physical change is mainly the change of the form of the substance, there is no obvious luminescence and heating phenomenon, while the color and state of the substance in the chemical change may change, and there are also luminescence, heat and other phenomena, such as water freezing is a physical change

Chemical changes can produce other substances, while physical changes cannot.

Physical properties are things that can be perceived by people or objects, which can be observed from several aspects such as color, odor conductivity, thermal conductivity, melting point, color, odor conductivity, thermal conductivity, melting point, boiling point, etc.

Chemical properties are reflected from chemical changes, mainly observed in terms of thermal stability, stability, etc.

Physical properties are properties that can be perceived by humans or can be measured by instruments, such as color, odor, morphology, melting point, boiling point, hardness, electrical conductivity, thermal conductivity, etc.

Chemical properties are the properties of substances that exhibit in chemical changes. Such as acidic, alkaline, oxidizing, reducing, thermally stable, etc.

Whether there is a new substance generation is the essential difference between physical change and chemical change, in physical change is mainly the change of material form, there is no obvious luminescence and heating phenomenon, while the color and state of the substance in chemical change may change, and there are also luminescence, heating and other phenomena, such as water freezing is a physical change, hydrogen combustion is a chemical change, but there must be no chemical change in the physical change, and the chemical change is often accompanied by physical change

If it's a question, it's faster to send it out (laughs).

Difference Between Chemical Change and Physical Change.

A chemical change is the creation of a new substance, and a physical change is simply a change in the state of the substance. Physical properties refer to the properties of matter that do not need to undergo chemical changes to exhibit. Chemical properties are properties that are exhibited only when a substance undergoes a chemical change.

The most important difference between physical change and chemical change is whether the substance changes: that is, the physical change at the molecular level is constant, while the chemical change recombines the atoms in the molecule into a new molecule. The difference between physical and chemical properties can also be distinguished from whether the nature of this property has undergone a material change.

As the name suggests, chemical change and physical change describe the change of a substance, while physical and chemical properties describe the properties of a substance. Don't you understand the difference between change and nature?

A change can be a verb or a noun, and here it refers to a noun, a dynamic process. Physical change refers to the change of the form of the object in the process of change, and no new material is generated, such as evaporation, vaporization, liquefaction, etc., which is mostly a change in a substance. Chemical change is a reaction that occurs during the contact of two or more substances, which is generally accompanied by luminescence or heat generation, and at the same time produces new substances.

Whereas, property can only be a noun and refers to the properties of an object. Physical properties generally refer to the density, morphology, etc. of an object, while chemical properties refer to the ease with which the substance reacts with other substances

Physical change is a phenomenon and physical properties are properties of matter itself.

Change is a process, and nature is a property of matter.

First of all, let's talk about physical change and chemical change, physical change refers to the change in the form of the object in the process of change, and no new substance is generated, such as evaporation, vaporization, liquefaction, etc., which is mostly a change in a substance. The chemical change is a reaction that occurs during the contact of two or more substances, which is generally accompanied by luminescence or heat generation, and at the same time produces new substances, such as putting quicklime into water will heat up and mature lime at the same time.

The properties refer to some properties of the object, the physical properties generally refer to the density, morphology, etc. of the object, and the chemical properties refer to the difficulty of the substance to react with other substances, such as combustion properties.

Physical changes do not produce new substances.

Chemical changes produce new substances.

Physical properties do not need to be reflected in chemical changes, such as hardness, density, color and other chemical properties are manifested in chemical changes.

Property is an intrinsic property of a substance, and change is a change in a property of a substance.

Physical properties such as mass, density, volume, color, odor, texture, melting and boiling point, solubility, etc., are properties that can be observed without chemical reactions. Chemical properties refer to the ability of a substance to react with a substance.

A physical change is a change in the physical properties mentioned above, while the substance itself (chemical formula) does not change. A chemical change is a change in matter. The original substance ceases to exist after chemical change, and a new substance is generated.

If the composition of something changes after a change, it is a chemical change, for example, hydrogen is ignited in oxygen to form water, which is a chemical change; If there is no change in its composition, but only a change in size and shape, it is a physical change. The properties that are only manifested in chemical reactions are chemical properties, such as iron rust, properties that do not involve the chemical composition of the molecules of matter, such as the aggregation state of matter (gas-liquid solid) and its changing state are physical properties. Do you understand?