Chất là gì | Vật thể là gì | Lý thuyết Hóa Học lớp 8


Welcome to, your go-to source for all things related to science and chemistry. In this article, we will be exploring the fundamental concepts of “Chất” (Substance) and “Vật thể” (Object). By understanding these concepts, you will gain a deeper insight into the world of chemistry.

Chất: What is it?

Defining Chất

Chất, a broad term in the field of chemistry, refers to the properties of a substance that constitute the corresponding object. These properties include physical characteristics such as solubility, melting point, boiling point, electrical conductivity, and thermal conductivity. Additionally, it encompasses the chemical properties of a substance, which involve studying whether it can be transformed into other substances.

Classification of Chất

Chất can be classified into two main categories: “Đơn chất” (Element) and “Hợp chất” (Compound). The classification is determined based on the chemical composition of the substance, specifically the bonds between chemical elements.

Đơn chất: Elements

Đơn chất refers to substances that are composed of a single chemical element. For example, we have metallic elements like Sodium (Na), Potassium (K), Barium (Ba), and non-metallic elements like Phosphorus (P), Chlorine (Cl2), and Iodine (I2).

Hợp chất: Compounds

Hợp chất, on the other hand, is composed of two or more chemical elements. Examples of compounds include water (H2O), Sodium Chloride (NaCl), and Potassium Hydroxide (KOH). Water, for instance, is composed of two chemical elements, Oxygen (O) and Hydrogen (H), bonded together through a covalent bond. Similarly, Sodium Chloride and Potassium Hydroxide are compounds formed by the combination of multiple chemical elements.

In addition to this classification, compounds can further be divided into inorganic compounds and organic compounds.

  • Inorganic Compounds: These compounds do not contain carbon (C) in their molecular structure. However, some exceptions like Carbon Monoxide (CO), Carbon Dioxide (CO2), Carbonic Acid (H2CO3), and Calcium Carbonate (CaCO3) are still classified as inorganic compounds.

  • Organic Compounds: These compounds are characterized by the presence of carbon (C) and hydrogen (H) atoms in their molecular structure. Examples of organic compounds include Ethanol (C2H5OH), Acetic Acid (CH3COOH), and Methane (CH4).

Vật thể: Exploring the Concept of Objects

Defining Vật thể

Vật thể refers to a physical entity that is formed and composed of matter. It is a more specific representation of what we commonly refer to as objects. We observe vật thể with our naked eyes or with the help of various tools and instruments.

Classification of Vật thể

Vật thể can be classified into two categories: “Vật thể tự nhiên” (Natural Object) and “Vật thể nhân tạo” (Artificial Object).

Vật thể tự nhiên: Natural Objects

Vật thể tự nhiên includes living organisms such as humans, plants, and animals. These objects are created by nature and exist without any human intervention.

Vật thể nhân tạo: Artificial Objects

Vật thể nhân tạo encompasses man-made objects such as clothing, vehicles, computers, and books. These objects are created by humans for specific purposes and serve various functions in our daily lives.


In this article, we have explored the concepts of chất and vật thể, two fundamental aspects of chemistry. We learned that chất refers to the properties of a substance and can be classified into Đơn chất (Elements) and Hợp chất (Compounds). On the other hand, vật thể represents physical entities and can be categorized as Vật thể tự nhiên (Natural Objects) and Vật thể nhân tạo (Artificial Objects).

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